Merge tag 'clk-renesas-for-v4.10-tag2' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers into clk-next

Pull Renesas clk driver updates from Geerty Uytterhoeven:

  - Add R-Car RST driver for obtaining mode pin state, and move the
    related functionality from platform code to DT,
  - Add r8a7743 and r8a7745 CPG Core Clock Definitions.

The commits here are intermingled with arm-soc material because
of the hard dependency we're breaking between mach code and
driver code. We're replacing that with a driver dependency
between the soc driver and the clk driver.

* tag 'clk-renesas-for-v4.10-tag2' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers: (25 commits)
  clk: renesas: Add r8a7745 CPG Core Clock Definitions
  clk: renesas: Add r8a7743 CPG Core Clock Definitions
  clk: renesas: rcar-gen2: Remove obsolete rcar_gen2_clocks_init()
  clk: renesas: r8a7779: Remove obsolete r8a7779_clocks_init()
  clk: renesas: r8a7778: Remove obsolete r8a7778_clocks_init()
  ARM: shmobile: rcar-gen2: Stop passing mode pins state to clock driver
  ARM: shmobile: r8a7779: Stop passing mode pins state to clock driver
  ARM: shmobile: r8a7778: Stop passing mode pins state to clock driver
  clk: renesas: rcar-gen3-cpg: Remove obsolete rcar_gen3_read_mode_pins()
  clk: renesas: r8a7796: Obtain mode pin values from R-Car RST driver
  clk: renesas: r8a7795: Obtain mode pin values from R-Car RST driver
  clk: renesas: rcar-gen2: Obtain mode pin values using RST driver
  clk: renesas: r8a7779: Obtain mode pin values from R-Car RST driver
  clk: renesas: r8a7778: Obtain mode pin values using R-Car RST driver
  arm64: renesas: r8a7796 dtsi: Add device node for RST module
  arm64: renesas: r8a7795 dtsi: Add device node for RST module
  ARM: dts: r8a7794: Add device node for RST module
  ARM: dts: r8a7793: Add device node for RST module
  ARM: dts: r8a7792: Add device node for RST module
  ARM: dts: r8a7791: Add device node for RST module
  ...

26 files changed, 333 insertions, 100 deletions

diff --git a/Documentation/devicetree/bindings/reset/renesas,rst.txt b/Documentation/devicetree/bindings/reset/renesas,rst.txt
new file mode 100644
index 000000000000..fe5e0f37b3c9
--- /dev/null
+++ b/Documentation/devicetree/bindings/reset/renesas,rst.txt
@@ -0,0 +1,37 @@
+DT bindings for the Renesas R-Car and RZ/G Reset Controllers
+
+The R-Car and RZ/G Reset Controllers provide reset control, and implement the
+following functions:
+  - Latching of the levels on mode pins when PRESET# is negated,
+  - Mode monitoring register,
+  - Reset control of peripheral devices (on R-Car Gen1),
+  - Watchdog timer (on R-Car Gen1),
+  - Register-based reset control and boot address registers for the various CPU
+    cores (on R-Car Gen2 and Gen3, and on RZ/G).
+
+
+Required properties:
+  - compatible: Should be
+		  - "renesas,<soctype>-reset-wdt" for R-Car Gen1,
+		  - "renesas,<soctype>-rst" for R-Car Gen2 and Gen3, and RZ/G
+		Examples with soctypes are:
+		  - "renesas,r8a7743-rst" (RZ/G1M)
+		  - "renesas,r8a7745-rst" (RZ/G1E)
+		  - "renesas,r8a7778-reset-wdt" (R-Car M1A)
+		  - "renesas,r8a7779-reset-wdt" (R-Car H1)
+		  - "renesas,r8a7790-rst" (R-Car H2)
+		  - "renesas,r8a7791-rst" (R-Car M2-W)
+		  - "renesas,r8a7792-rst" (R-Car V2H
+		  - "renesas,r8a7793-rst" (R-Car M2-N)
+		  - "renesas,r8a7794-rst" (R-Car E2)
+		  - "renesas,r8a7795-rst" (R-Car H3)
+		  - "renesas,r8a7796-rst" (R-Car M3-W)
+  - reg: Address start and address range for the device.
+
+
+Example:
+
+	rst: reset-controller@e6160000 {
+		compatible = "renesas,r8a7795-rst";
+		reg = <0 0xe6160000 0 0x0200>;
+	};
diff --git a/arch/arm/boot/dts/r8a7778.dtsi b/arch/arm/boot/dts/r8a7778.dtsi
index e571d66ea0fe..3d0a18abd408 100644
--- a/arch/arm/boot/dts/r8a7778.dtsi
+++ b/arch/arm/boot/dts/r8a7778.dtsi
@@ -626,4 +626,9 @@
 				"sru-src6", "sru-src7", "sru-src8";
 		};
 	};
+
+	rst: reset-controller@ffcc0000 {
+		compatible = "renesas,r8a7778-reset-wdt";
+		reg = <0xffcc0000 0x40>;
+	};
 };
diff --git a/arch/arm/boot/dts/r8a7779.dtsi b/arch/arm/boot/dts/r8a7779.dtsi
index b9bbcce69dfb..8cf16008a09b 100644
--- a/arch/arm/boot/dts/r8a7779.dtsi
+++ b/arch/arm/boot/dts/r8a7779.dtsi
@@ -590,6 +590,11 @@
 		};
 	};
 
+	rst: reset-controller@ffcc0000 {
+		compatible = "renesas,r8a7779-reset-wdt";
+		reg = <0xffcc0000 0x48>;
+	};
+
 	sysc: system-controller@ffd85000 {
 		compatible = "renesas,r8a7779-sysc";
 		reg = <0xffd85000 0x0200>;
diff --git a/arch/arm/boot/dts/r8a7790.dtsi b/arch/arm/boot/dts/r8a7790.dtsi
index 351fcc2f87df..3f10b0bf1b08 100644
--- a/arch/arm/boot/dts/r8a7790.dtsi
+++ b/arch/arm/boot/dts/r8a7790.dtsi
@@ -1471,6 +1471,11 @@
 		};
 	};
 
+	rst: reset-controller@e6160000 {
+		compatible = "renesas,r8a7790-rst";
+		reg = <0 0xe6160000 0 0x0100>;
+	};
+
 	sysc: system-controller@e6180000 {
 		compatible = "renesas,r8a7790-sysc";
 		reg = <0 0xe6180000 0 0x0200>;
diff --git a/arch/arm/boot/dts/r8a7791.dtsi b/arch/arm/boot/dts/r8a7791.dtsi
index 162b55c665a3..c465c79bcca6 100644
--- a/arch/arm/boot/dts/r8a7791.dtsi
+++ b/arch/arm/boot/dts/r8a7791.dtsi
@@ -1482,6 +1482,11 @@
 		};
 	};
 
+	rst: reset-controller@e6160000 {
+		compatible = "renesas,r8a7791-rst";
+		reg = <0 0xe6160000 0 0x0100>;
+	};
+
 	sysc: system-controller@e6180000 {
 		compatible = "renesas,r8a7791-sysc";
 		reg = <0 0xe6180000 0 0x0200>;
diff --git a/arch/arm/boot/dts/r8a7792.dtsi b/arch/arm/boot/dts/r8a7792.dtsi
index 713141d38b3e..6e1f61f65d29 100644
--- a/arch/arm/boot/dts/r8a7792.dtsi
+++ b/arch/arm/boot/dts/r8a7792.dtsi
@@ -118,6 +118,11 @@
 				      IRQ_TYPE_LEVEL_LOW)>;
 		};
 
+		rst: reset-controller@e6160000 {
+			compatible = "renesas,r8a7792-rst";
+			reg = <0 0xe6160000 0 0x0100>;
+		};
+
 		sysc: system-controller@e6180000 {
 			compatible = "renesas,r8a7792-sysc";
 			reg = <0 0xe6180000 0 0x0200>;
diff --git a/arch/arm/boot/dts/r8a7793.dtsi b/arch/arm/boot/dts/r8a7793.dtsi
index 8d02aacf2892..e4b385eccf74 100644
--- a/arch/arm/boot/dts/r8a7793.dtsi
+++ b/arch/arm/boot/dts/r8a7793.dtsi
@@ -1279,6 +1279,11 @@
 		};
 	};
 
+	rst: reset-controller@e6160000 {
+		compatible = "renesas,r8a7793-rst";
+		reg = <0 0xe6160000 0 0x0100>;
+	};
+
 	sysc: system-controller@e6180000 {
 		compatible = "renesas,r8a7793-sysc";
 		reg = <0 0xe6180000 0 0x0200>;
diff --git a/arch/arm/boot/dts/r8a7794.dtsi b/arch/arm/boot/dts/r8a7794.dtsi
index 9365580a194f..69e4f4fad89b 100644
--- a/arch/arm/boot/dts/r8a7794.dtsi
+++ b/arch/arm/boot/dts/r8a7794.dtsi
@@ -1375,6 +1375,11 @@
 		};
 	};
 
+	rst: reset-controller@e6160000 {
+		compatible = "renesas,r8a7794-rst";
+		reg = <0 0xe6160000 0 0x0100>;
+	};
+
 	sysc: system-controller@e6180000 {
 		compatible = "renesas,r8a7794-sysc";
 		reg = <0 0xe6180000 0 0x0200>;
diff --git a/arch/arm/mach-shmobile/setup-r8a7778.c b/arch/arm/mach-shmobile/setup-r8a7778.c
index cf236db686a9..7fa4a0b5f654 100644
--- a/arch/arm/mach-shmobile/setup-r8a7778.c
+++ b/arch/arm/mach-shmobile/setup-r8a7778.c
@@ -15,7 +15,6 @@
  * GNU General Public License for more details.
  */
 
-#include <linux/clk/renesas.h>
 #include <linux/io.h>
 #include <linux/irqchip.h>
 
@@ -23,19 +22,6 @@
 
 #include "common.h"
 
-#define MODEMR 0xffcc0020
-
-static void __init r8a7778_timer_init(void)
-{
-	u32 mode;
-	void __iomem *modemr = ioremap_nocache(MODEMR, 4);
-
-	BUG_ON(!modemr);
-	mode = ioread32(modemr);
-	iounmap(modemr);
-	r8a7778_clocks_init(mode);
-}
-
 #define INT2SMSKCR0	0x82288 /* 0xfe782288 */
 #define INT2SMSKCR1	0x8228c /* 0xfe78228c */
 
@@ -70,6 +56,5 @@ DT_MACHINE_START(R8A7778_DT, "Generic R8A7778 (Flattened Device Tree)")
 	.init_early	= shmobile_init_delay,
 	.init_irq	= r8a7778_init_irq_dt,
 	.init_late	= shmobile_init_late,
-	.init_time	= r8a7778_timer_init,
 	.dt_compat	= r8a7778_compat_dt,
 MACHINE_END
diff --git a/arch/arm/mach-shmobile/setup-r8a7779.c b/arch/arm/mach-shmobile/setup-r8a7779.c
index 0007ff51d180..0686112f2435 100644
--- a/arch/arm/mach-shmobile/setup-r8a7779.c
+++ b/arch/arm/mach-shmobile/setup-r8a7779.c
@@ -14,8 +14,6 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */
-#include <linux/clk/renesas.h>
-#include <linux/clocksource.h>
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/irqchip.h>
@@ -76,30 +74,6 @@ static void __init r8a7779_init_irq_dt(void)
 	__raw_writel(0x003fee3f, INT2SMSKCR4);
 }
 
-#define MODEMR		0xffcc0020
-
-static u32 __init r8a7779_read_mode_pins(void)
-{
-	static u32 mode;
-	static bool mode_valid;
-
-	if (!mode_valid) {
-		void __iomem *modemr = ioremap_nocache(MODEMR, PAGE_SIZE);
-		BUG_ON(!modemr);
-		mode = ioread32(modemr);
-		iounmap(modemr);
-		mode_valid = true;
-	}
-
-	return mode;
-}
-
-static void __init r8a7779_init_time(void)
-{
-	r8a7779_clocks_init(r8a7779_read_mode_pins());
-	clocksource_probe();
-}
-
 static const char *const r8a7779_compat_dt[] __initconst = {
 	"renesas,r8a7779",
 	NULL,
@@ -109,7 +83,6 @@ DT_MACHINE_START(R8A7779_DT, "Generic R8A7779 (Flattened Device Tree)")
 	.smp		= smp_ops(r8a7779_smp_ops),
 	.map_io		= r8a7779_map_io,
 	.init_early	= shmobile_init_delay,
-	.init_time	= r8a7779_init_time,
 	.init_irq	= r8a7779_init_irq_dt,
 	.init_late	= shmobile_init_late,
 	.dt_compat	= r8a7779_compat_dt,
diff --git a/arch/arm/mach-shmobile/setup-rcar-gen2.c b/arch/arm/mach-shmobile/setup-rcar-gen2.c
index afb9fdcd3d90..b527258e0a62 100644
--- a/arch/arm/mach-shmobile/setup-rcar-gen2.c
+++ b/arch/arm/mach-shmobile/setup-rcar-gen2.c
@@ -15,7 +15,7 @@
  * GNU General Public License for more details.
  */
 
-#include <linux/clk/renesas.h>
+#include <linux/clk-provider.h>
 #include <linux/clocksource.h>
 #include <linux/device.h>
 #include <linux/dma-contiguous.h>
@@ -71,7 +71,6 @@ static unsigned int __init get_extal_freq(void)
 
 void __init rcar_gen2_timer_init(void)
 {
-	u32 mode = rcar_gen2_read_mode_pins();
 #ifdef CONFIG_ARM_ARCH_TIMER
 	void __iomem *base;
 	u32 freq;
@@ -130,7 +129,7 @@ void __init rcar_gen2_timer_init(void)
 	iounmap(base);
 #endif /* CONFIG_ARM_ARCH_TIMER */
 
-	rcar_gen2_clocks_init(mode);
+	of_clk_init(NULL);
 	clocksource_probe();
 }
 
diff --git a/arch/arm64/boot/dts/renesas/r8a7795.dtsi b/arch/arm64/boot/dts/renesas/r8a7795.dtsi
index 8c15040f2540..625dda713548 100644
--- a/arch/arm64/boot/dts/renesas/r8a7795.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a7795.dtsi
@@ -321,6 +321,11 @@
 			#power-domain-cells = <0>;
 		};
 
+		rst: reset-controller@e6160000 {
+			compatible = "renesas,r8a7795-rst";
+			reg = <0 0xe6160000 0 0x0200>;
+		};
+
 		sysc: system-controller@e6180000 {
 			compatible = "renesas,r8a7795-sysc";
 			reg = <0 0xe6180000 0 0x0400>;
diff --git a/arch/arm64/boot/dts/renesas/r8a7796.dtsi b/arch/arm64/boot/dts/renesas/r8a7796.dtsi
index 9217da983525..75c8c55a8248 100644
--- a/arch/arm64/boot/dts/renesas/r8a7796.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a7796.dtsi
@@ -233,6 +233,11 @@
 			#power-domain-cells = <0>;
 		};
 
+		rst: reset-controller@e6160000 {
+			compatible = "renesas,r8a7796-rst";
+			reg = <0 0xe6160000 0 0x0200>;
+		};
+
 		sysc: system-controller@e6180000 {
 			compatible = "renesas,r8a7796-sysc";
 			reg = <0 0xe6180000 0 0x0400>;
diff --git a/drivers/clk/renesas/clk-r8a7778.c b/drivers/clk/renesas/clk-r8a7778.c
index 40e3a501a50e..886a8380e912 100644
--- a/drivers/clk/renesas/clk-r8a7778.c
+++ b/drivers/clk/renesas/clk-r8a7778.c
@@ -12,6 +12,7 @@
 #include <linux/clk/renesas.h>
 #include <linux/of_address.h>
 #include <linux/slab.h>
+#include <linux/soc/renesas/rcar-rst.h>
 
 struct r8a7778_cpg {
 	struct clk_onecell_data data;
@@ -83,6 +84,18 @@ static void __init r8a7778_cpg_clocks_init(struct device_node *np)
 	struct clk **clks;
 	unsigned int i;
 	int num_clks;
+	u32 mode;
+
+	if (rcar_rst_read_mode_pins(&mode))
+		return;
+
+	BUG_ON(!(mode & BIT(19)));
+
+	cpg_mode_rates = (!!(mode & BIT(18)) << 2) |
+			 (!!(mode & BIT(12)) << 1) |
+			 (!!(mode & BIT(11)));
+	cpg_mode_divs = (!!(mode & BIT(2)) << 1) |
+			(!!(mode & BIT(1)));
 
 	num_clks = of_property_count_strings(np, "clock-output-names");
 	if (num_clks < 0) {
@@ -130,16 +143,3 @@ static void __init r8a7778_cpg_clocks_init(struct device_node *np)
 
 CLK_OF_DECLARE(r8a7778_cpg_clks, "renesas,r8a7778-cpg-clocks",
 	       r8a7778_cpg_clocks_init);
-
-void __init r8a7778_clocks_init(u32 mode)
-{
-	BUG_ON(!(mode & BIT(19)));
-
-	cpg_mode_rates = (!!(mode & BIT(18)) << 2) |
-			 (!!(mode & BIT(12)) << 1) |
-			 (!!(mode & BIT(11)));
-	cpg_mode_divs = (!!(mode & BIT(2)) << 1) |
-			(!!(mode & BIT(1)));
-
-	of_clk_init(NULL);
-}
diff --git a/drivers/clk/renesas/clk-r8a7779.c b/drivers/clk/renesas/clk-r8a7779.c
index cf2a37df03b1..27fbfafaf2cd 100644
--- a/drivers/clk/renesas/clk-r8a7779.c
+++ b/drivers/clk/renesas/clk-r8a7779.c
@@ -18,6 +18,7 @@
 #include <linux/of_address.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <linux/soc/renesas/rcar-rst.h>
 
 #include <dt-bindings/clock/r8a7779-clock.h>
 
@@ -88,8 +89,6 @@ static const unsigned int cpg_plla_mult[4] __initconst = { 42, 48, 56, 64 };
  * Initialization
  */
 
-static u32 cpg_mode __initdata;
-
 static struct clk * __init
 r8a7779_cpg_register_clock(struct device_node *np, struct r8a7779_cpg *cpg,
 			   const struct cpg_clk_config *config,
@@ -127,6 +126,10 @@ static void __init r8a7779_cpg_clocks_init(struct device_node *np)
 	struct clk **clks;
 	unsigned int i, plla_mult;
 	int num_clks;
+	u32 mode;
+
+	if (rcar_rst_read_mode_pins(&mode))
+		return;
 
 	num_clks = of_property_count_strings(np, "clock-output-names");
 	if (num_clks < 0) {
@@ -148,8 +151,8 @@ static void __init r8a7779_cpg_clocks_init(struct device_node *np)
 	cpg->data.clks = clks;
 	cpg->data.clk_num = num_clks;
 
-	config = &cpg_clk_configs[CPG_CLK_CONFIG_INDEX(cpg_mode)];
-	plla_mult = cpg_plla_mult[CPG_PLLA_MULT_INDEX(cpg_mode)];
+	config = &cpg_clk_configs[CPG_CLK_CONFIG_INDEX(mode)];
+	plla_mult = cpg_plla_mult[CPG_PLLA_MULT_INDEX(mode)];
 
 	for (i = 0; i < num_clks; ++i) {
 		const char *name;
@@ -173,10 +176,3 @@ static void __init r8a7779_cpg_clocks_init(struct device_node *np)
 }
 CLK_OF_DECLARE(r8a7779_cpg_clks, "renesas,r8a7779-cpg-clocks",
 	       r8a7779_cpg_clocks_init);
-
-void __init r8a7779_clocks_init(u32 mode)
-{
-	cpg_mode = mode;
-
-	of_clk_init(NULL);
-}
diff --git a/drivers/clk/renesas/clk-rcar-gen2.c b/drivers/clk/renesas/clk-rcar-gen2.c
index 00e6aba4b9c0..f39519edc645 100644
--- a/drivers/clk/renesas/clk-rcar-gen2.c
+++ b/drivers/clk/renesas/clk-rcar-gen2.c
@@ -19,6 +19,7 @@
 #include <linux/of_address.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <linux/soc/renesas/rcar-rst.h>
 
 struct rcar_gen2_cpg {
 	struct clk_onecell_data data;
@@ -364,6 +365,23 @@ rcar_gen2_cpg_register_clock(struct device_node *np, struct rcar_gen2_cpg *cpg,
 						 4, 0, table, &cpg->lock);
 }
 
+/*
+ * Reset register definitions.
+ */
+#define MODEMR	0xe6160060
+
+static u32 __init rcar_gen2_read_mode_pins(void)
+{
+	void __iomem *modemr = ioremap_nocache(MODEMR, 4);
+	u32 mode;
+
+	BUG_ON(!modemr);
+	mode = ioread32(modemr);
+	iounmap(modemr);
+
+	return mode;
+}
+
 static void __init rcar_gen2_cpg_clocks_init(struct device_node *np)
 {
 	const struct cpg_pll_config *config;
@@ -372,6 +390,13 @@ static void __init rcar_gen2_cpg_clocks_init(struct device_node *np)
 	unsigned int i;
 	int num_clks;
 
+	if (rcar_rst_read_mode_pins(&cpg_mode)) {
+		/* Backward-compatibility with old DT */
+		pr_warn("%s: failed to obtain mode pins from RST\n",
+			np->full_name);
+		cpg_mode = rcar_gen2_read_mode_pins();
+	}
+
 	num_clks = of_property_count_strings(np, "clock-output-names");
 	if (num_clks < 0) {
 		pr_err("%s: failed to count clocks\n", __func__);
@@ -420,10 +445,3 @@ static void __init rcar_gen2_cpg_clocks_init(struct device_node *np)
 }
 CLK_OF_DECLARE(rcar_gen2_cpg_clks, "renesas,rcar-gen2-cpg-clocks",
 	       rcar_gen2_cpg_clocks_init);
-
-void __init rcar_gen2_clocks_init(u32 mode)
-{
-	cpg_mode = mode;
-
-	of_clk_init(NULL);
-}
diff --git a/drivers/clk/renesas/r8a7795-cpg-mssr.c b/drivers/clk/renesas/r8a7795-cpg-mssr.c
index f255e451e8ca..726c3d7940b4 100644
--- a/drivers/clk/renesas/r8a7795-cpg-mssr.c
+++ b/drivers/clk/renesas/r8a7795-cpg-mssr.c
@@ -15,6 +15,7 @@
 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/soc/renesas/rcar-rst.h>
 
 #include <dt-bindings/clock/r8a7795-cpg-mssr.h>
 
@@ -311,7 +312,12 @@ static const struct rcar_gen3_cpg_pll_config cpg_pll_configs[16] __initconst = {
 static int __init r8a7795_cpg_mssr_init(struct device *dev)
 {
 	const struct rcar_gen3_cpg_pll_config *cpg_pll_config;
-	u32 cpg_mode = rcar_gen3_read_mode_pins();
+	u32 cpg_mode;
+	int error;
+
+	error = rcar_rst_read_mode_pins(&cpg_mode);
+	if (error)
+		return error;
 
 	cpg_pll_config = &cpg_pll_configs[CPG_PLL_CONFIG_INDEX(cpg_mode)];
 	if (!cpg_pll_config->extal_div) {
diff --git a/drivers/clk/renesas/r8a7796-cpg-mssr.c b/drivers/clk/renesas/r8a7796-cpg-mssr.c
index c880d72106e1..8fdf5537939d 100644
--- a/drivers/clk/renesas/r8a7796-cpg-mssr.c
+++ b/drivers/clk/renesas/r8a7796-cpg-mssr.c
@@ -16,6 +16,7 @@
 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/soc/renesas/rcar-rst.h>
 
 #include <dt-bindings/clock/r8a7796-cpg-mssr.h>
 
@@ -235,7 +236,12 @@ static const struct rcar_gen3_cpg_pll_config cpg_pll_configs[16] __initconst = {
 static int __init r8a7796_cpg_mssr_init(struct device *dev)
 {
 	const struct rcar_gen3_cpg_pll_config *cpg_pll_config;
-	u32 cpg_mode = rcar_gen3_read_mode_pins();
+	u32 cpg_mode;
+	int error;
+
+	error = rcar_rst_read_mode_pins(&cpg_mode);
+	if (error)
+		return error;
 
 	cpg_pll_config = &cpg_pll_configs[CPG_PLL_CONFIG_INDEX(cpg_mode)];
 	if (!cpg_pll_config->extal_div) {
diff --git a/drivers/clk/renesas/rcar-gen3-cpg.c b/drivers/clk/renesas/rcar-gen3-cpg.c
index 28ddb71545b8..742f6dc7c156 100644
--- a/drivers/clk/renesas/rcar-gen3-cpg.c
+++ b/drivers/clk/renesas/rcar-gen3-cpg.c
@@ -333,23 +333,6 @@ struct clk * __init rcar_gen3_cpg_clk_register(struct device *dev,
 					 __clk_get_name(parent), 0, mult, div);
 }
 
-/*
- * Reset register definitions.
- */
-#define MODEMR	0xe6160060
-
-u32 __init rcar_gen3_read_mode_pins(void)
-{
-	void __iomem *modemr = ioremap_nocache(MODEMR, 4);
-	u32 mode;
-
-	BUG_ON(!modemr);
-	mode = ioread32(modemr);
-	iounmap(modemr);
-
-	return mode;
-}
-
 int __init rcar_gen3_cpg_init(const struct rcar_gen3_cpg_pll_config *config,
 			      unsigned int clk_extalr)
 {
diff --git a/drivers/clk/renesas/rcar-gen3-cpg.h b/drivers/clk/renesas/rcar-gen3-cpg.h
index f699085147d1..f788f481dd42 100644
--- a/drivers/clk/renesas/rcar-gen3-cpg.h
+++ b/drivers/clk/renesas/rcar-gen3-cpg.h
@@ -33,7 +33,6 @@ struct rcar_gen3_cpg_pll_config {
 
 #define CPG_RCKCR	0x240
 
-u32 rcar_gen3_read_mode_pins(void);
 struct clk *rcar_gen3_cpg_clk_register(struct device *dev,
 	const struct cpg_core_clk *core, const struct cpg_mssr_info *info,
 	struct clk **clks, void __iomem *base);
diff --git a/drivers/soc/renesas/Makefile b/drivers/soc/renesas/Makefile
index 623039c3514c..86cc78cd1962 100644
--- a/drivers/soc/renesas/Makefile
+++ b/drivers/soc/renesas/Makefile
@@ -1,3 +1,8 @@
+obj-$(CONFIG_ARCH_RCAR_GEN1)	+= rcar-rst.o
+obj-$(CONFIG_ARCH_RCAR_GEN2)	+= rcar-rst.o
+obj-$(CONFIG_ARCH_R8A7795)	+= rcar-rst.o
+obj-$(CONFIG_ARCH_R8A7796)	+= rcar-rst.o
+
 obj-$(CONFIG_ARCH_R8A7779)	+= rcar-sysc.o r8a7779-sysc.o
 obj-$(CONFIG_ARCH_R8A7790)	+= rcar-sysc.o r8a7790-sysc.o
 obj-$(CONFIG_ARCH_R8A7791)	+= rcar-sysc.o r8a7791-sysc.o
diff --git a/drivers/soc/renesas/rcar-rst.c b/drivers/soc/renesas/rcar-rst.c
new file mode 100644
index 000000000000..a6d1c26d3167
--- /dev/null
+++ b/drivers/soc/renesas/rcar-rst.c
@@ -0,0 +1,92 @@
+/*
+ * R-Car Gen1 RESET/WDT, R-Car Gen2, Gen3, and RZ/G RST Driver
+ *
+ * Copyright (C) 2016 Glider bvba
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/soc/renesas/rcar-rst.h>
+
+struct rst_config {
+	unsigned int modemr;	/* Mode Monitoring Register Offset */
+};
+
+static const struct rst_config rcar_rst_gen1 __initconst = {
+	.modemr = 0x20,
+};
+
+static const struct rst_config rcar_rst_gen2 __initconst = {
+	.modemr = 0x60,
+};
+
+static const struct of_device_id rcar_rst_matches[] __initconst = {
+	/* RZ/G is handled like R-Car Gen2 */
+	{ .compatible = "renesas,r8a7743-rst", .data = &rcar_rst_gen2 },
+	{ .compatible = "renesas,r8a7745-rst", .data = &rcar_rst_gen2 },
+	/* R-Car Gen1 */
+	{ .compatible = "renesas,r8a7778-reset-wdt", .data = &rcar_rst_gen1 },
+	{ .compatible = "renesas,r8a7779-reset-wdt", .data = &rcar_rst_gen1 },
+	/* R-Car Gen2 */
+	{ .compatible = "renesas,r8a7790-rst", .data = &rcar_rst_gen2 },
+	{ .compatible = "renesas,r8a7791-rst", .data = &rcar_rst_gen2 },
+	{ .compatible = "renesas,r8a7792-rst", .data = &rcar_rst_gen2 },
+	{ .compatible = "renesas,r8a7793-rst", .data = &rcar_rst_gen2 },
+	{ .compatible = "renesas,r8a7794-rst", .data = &rcar_rst_gen2 },
+	/* R-Car Gen3 is handled like R-Car Gen2 */
+	{ .compatible = "renesas,r8a7795-rst", .data = &rcar_rst_gen2 },
+	{ .compatible = "renesas,r8a7796-rst", .data = &rcar_rst_gen2 },
+	{ /* sentinel */ }
+};
+
+static void __iomem *rcar_rst_base __initdata;
+static u32 saved_mode __initdata;
+
+static int __init rcar_rst_init(void)
+{
+	const struct of_device_id *match;
+	const struct rst_config *cfg;
+	struct device_node *np;
+	void __iomem *base;
+	int error = 0;
+
+	np = of_find_matching_node_and_match(NULL, rcar_rst_matches, &match);
+	if (!np)
+		return -ENODEV;
+
+	base = of_iomap(np, 0);
+	if (!base) {
+		pr_warn("%s: Cannot map regs\n", np->full_name);
+		error = -ENOMEM;
+		goto out_put;
+	}
+
+	rcar_rst_base = base;
+	cfg = match->data;
+	saved_mode = ioread32(base + cfg->modemr);
+
+	pr_debug("%s: MODE = 0x%08x\n", np->full_name, saved_mode);
+
+out_put:
+	of_node_put(np);
+	return error;
+}
+
+int __init rcar_rst_read_mode_pins(u32 *mode)
+{
+	int error;
+
+	if (!rcar_rst_base) {
+		error = rcar_rst_init();
+		if (error)
+			return error;
+	}
+
+	*mode = saved_mode;
+	return 0;
+}
diff --git a/include/dt-bindings/clock/r8a7743-cpg-mssr.h b/include/dt-bindings/clock/r8a7743-cpg-mssr.h
new file mode 100644
index 000000000000..e1d1f3c6a99e
--- /dev/null
+++ b/include/dt-bindings/clock/r8a7743-cpg-mssr.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2016 Cogent Embedded Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#ifndef __DT_BINDINGS_CLOCK_R8A7743_CPG_MSSR_H__
+#define __DT_BINDINGS_CLOCK_R8A7743_CPG_MSSR_H__
+
+#include <dt-bindings/clock/renesas-cpg-mssr.h>
+
+/* r8a7743 CPG Core Clocks */
+#define R8A7743_CLK_Z		0
+#define R8A7743_CLK_ZG		1
+#define R8A7743_CLK_ZTR		2
+#define R8A7743_CLK_ZTRD2	3
+#define R8A7743_CLK_ZT		4
+#define R8A7743_CLK_ZX		5
+#define R8A7743_CLK_ZS		6
+#define R8A7743_CLK_HP		7
+#define R8A7743_CLK_B		9
+#define R8A7743_CLK_LB		10
+#define R8A7743_CLK_P		11
+#define R8A7743_CLK_CL		12
+#define R8A7743_CLK_M2		13
+#define R8A7743_CLK_ZB3		15
+#define R8A7743_CLK_ZB3D2	16
+#define R8A7743_CLK_DDR		17
+#define R8A7743_CLK_SDH		18
+#define R8A7743_CLK_SD0		19
+#define R8A7743_CLK_SD2		20
+#define R8A7743_CLK_SD3		21
+#define R8A7743_CLK_MMC0	22
+#define R8A7743_CLK_MP		23
+#define R8A7743_CLK_QSPI	26
+#define R8A7743_CLK_CP		27
+#define R8A7743_CLK_RCAN	28
+#define R8A7743_CLK_R		29
+#define R8A7743_CLK_OSC		30
+
+#endif /* __DT_BINDINGS_CLOCK_R8A7743_CPG_MSSR_H__ */
diff --git a/include/dt-bindings/clock/r8a7745-cpg-mssr.h b/include/dt-bindings/clock/r8a7745-cpg-mssr.h
new file mode 100644
index 000000000000..56ad6f0c6760
--- /dev/null
+++ b/include/dt-bindings/clock/r8a7745-cpg-mssr.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2016 Cogent Embedded Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#ifndef __DT_BINDINGS_CLOCK_R8A7745_CPG_MSSR_H__
+#define __DT_BINDINGS_CLOCK_R8A7745_CPG_MSSR_H__
+
+#include <dt-bindings/clock/renesas-cpg-mssr.h>
+
+/* r8a7745 CPG Core Clocks */
+#define R8A7745_CLK_Z2		0
+#define R8A7745_CLK_ZG		1
+#define R8A7745_CLK_ZTR		2
+#define R8A7745_CLK_ZTRD2	3
+#define R8A7745_CLK_ZT		4
+#define R8A7745_CLK_ZX		5
+#define R8A7745_CLK_ZS		6
+#define R8A7745_CLK_HP		7
+#define R8A7745_CLK_B		9
+#define R8A7745_CLK_LB		10
+#define R8A7745_CLK_P		11
+#define R8A7745_CLK_CL		12
+#define R8A7745_CLK_CP		13
+#define R8A7745_CLK_M2		14
+#define R8A7745_CLK_ZB3		16
+#define R8A7745_CLK_ZB3D2	17
+#define R8A7745_CLK_DDR		18
+#define R8A7745_CLK_SDH		19
+#define R8A7745_CLK_SD0		20
+#define R8A7745_CLK_SD2		21
+#define R8A7745_CLK_SD3		22
+#define R8A7745_CLK_MMC0	23
+#define R8A7745_CLK_MP		24
+#define R8A7745_CLK_QSPI	25
+#define R8A7745_CLK_CPEX	26
+#define R8A7745_CLK_RCAN	27
+#define R8A7745_CLK_R		28
+#define R8A7745_CLK_OSC		29
+
+#endif /* __DT_BINDINGS_CLOCK_R8A7745_CPG_MSSR_H__ */
diff --git a/include/linux/clk/renesas.h b/include/linux/clk/renesas.h
index ba6fa4148515..9ebf1f8243bb 100644
--- a/include/linux/clk/renesas.h
+++ b/include/linux/clk/renesas.h
@@ -20,10 +20,6 @@ struct device;
 struct device_node;
 struct generic_pm_domain;
 
-void r8a7778_clocks_init(u32 mode);
-void r8a7779_clocks_init(u32 mode);
-void rcar_gen2_clocks_init(u32 mode);
-
 void cpg_mstp_add_clk_domain(struct device_node *np);
 #ifdef CONFIG_CLK_RENESAS_CPG_MSTP
 int cpg_mstp_attach_dev(struct generic_pm_domain *unused, struct device *dev);
diff --git a/include/linux/soc/renesas/rcar-rst.h b/include/linux/soc/renesas/rcar-rst.h
new file mode 100644
index 000000000000..a18e0783946b
--- /dev/null
+++ b/include/linux/soc/renesas/rcar-rst.h
@@ -0,0 +1,6 @@
+#ifndef __LINUX_SOC_RENESAS_RCAR_RST_H__
+#define __LINUX_SOC_RENESAS_RCAR_RST_H__
+
+int rcar_rst_read_mode_pins(u32 *mode);
+
+#endif /* __LINUX_SOC_RENESAS_RCAR_RST_H__ */