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authorDinh Nguyen <dinguyen@altera.com>2014-02-19 15:11:11 -0600
committerMike Turquette <mturquette@linaro.org>2014-02-26 12:23:40 -0800
commitb89cd950cbcd6a6aca37e82ecf369ab9909fdf24 (patch)
tree711a1ada6d863af2fe3f8022d27820c7bd479a0e /drivers/clk/socfpga
parent5585f7317573873f95c1bb7748322c62a6c3a919 (diff)
downloadlinux-b89cd950cbcd6a6aca37e82ecf369ab9909fdf24.tar.bz2
clk: socfpga: Support multiple parents for the pll clocks
The PLLs can be from 3 different sources: osc1, osc2, or the f2s_ref_clk. Update the clock driver to be able to get the correct parent. Signed-off-by: Dinh Nguyen <dinguyen@altera.com> Cc: Steffen Trumtrar <s.trumtrar@pengutronix.de> Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers/clk/socfpga')
-rw-r--r--drivers/clk/socfpga/clk-pll.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/drivers/clk/socfpga/clk-pll.c b/drivers/clk/socfpga/clk-pll.c
index 834b6e961971..88dafb5e9627 100644
--- a/drivers/clk/socfpga/clk-pll.c
+++ b/drivers/clk/socfpga/clk-pll.c
@@ -38,6 +38,9 @@
#define SOCFPGA_PLL_DIVQ_MASK 0x003F0000
#define SOCFPGA_PLL_DIVQ_SHIFT 16
+#define CLK_MGR_PLL_CLK_SRC_SHIFT 22
+#define CLK_MGR_PLL_CLK_SRC_MASK 0x3
+
#define to_socfpga_clk(p) container_of(p, struct socfpga_pll, hw.hw)
static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk,
@@ -60,8 +63,19 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk,
return (unsigned long)vco_freq;
}
+static u8 clk_pll_get_parent(struct clk_hw *hwclk)
+{
+ u32 pll_src;
+ struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
+
+ pll_src = readl(socfpgaclk->hw.reg);
+ return (pll_src >> CLK_MGR_PLL_CLK_SRC_SHIFT) &
+ CLK_MGR_PLL_CLK_SRC_MASK;
+}
+
static struct clk_ops clk_pll_ops = {
.recalc_rate = clk_pll_recalc_rate,
+ .get_parent = clk_pll_get_parent,
};
static __init struct clk *__socfpga_pll_init(struct device_node *node,
@@ -71,9 +85,10 @@ static __init struct clk *__socfpga_pll_init(struct device_node *node,
struct clk *clk;
struct socfpga_pll *pll_clk;
const char *clk_name = node->name;
- const char *parent_name;
+ const char *parent_name[SOCFPGA_MAX_PARENTS];
struct clk_init_data init;
int rc;
+ int i = 0;
of_property_read_u32(node, "reg", &reg);
@@ -88,10 +103,13 @@ static __init struct clk *__socfpga_pll_init(struct device_node *node,
init.name = clk_name;
init.ops = ops;
init.flags = 0;
- parent_name = of_clk_get_parent_name(node, 0);
- init.parent_names = parent_name ? &parent_name : NULL;
- init.num_parents = parent_name ? 1 : 0;
+ while (i < SOCFPGA_MAX_PARENTS && (parent_name[i] =
+ of_clk_get_parent_name(node, i)) != NULL)
+ i++;
+
+ init.num_parents = i;
+ init.parent_names = parent_name;
pll_clk->hw.hw.init = &init;
pll_clk->hw.bit_idx = SOCFPGA_PLL_EXT_ENA;