From f84c9c3ca9770bd847cb361d67bd385499a20d37 Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Tue, 7 Jul 2015 14:57:37 +0200 Subject: clk: renesas: rcar-gen2: Obtain mode pin values using RST driver Obtain the values of the mode pins from the R-Car RST driver, which relies on the presence in DT of a device node for the RST module. Fall back to our own private copy of rcar_gen2_read_mode_pins() for backward-compatibility with old DTs. Signed-off-by: Geert Uytterhoeven Acked-by: Dirk Behme --- drivers/clk/renesas/clk-rcar-gen2.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'drivers/clk/renesas') diff --git a/drivers/clk/renesas/clk-rcar-gen2.c b/drivers/clk/renesas/clk-rcar-gen2.c index 00e6aba4b9c0..3291fd430ad4 100644 --- a/drivers/clk/renesas/clk-rcar-gen2.c +++ b/drivers/clk/renesas/clk-rcar-gen2.c @@ -19,6 +19,7 @@ #include #include #include +#include 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__); -- cgit v1.2.3