From b89cd950cbcd6a6aca37e82ecf369ab9909fdf24 Mon Sep 17 00:00:00 2001 From: Dinh Nguyen Date: Wed, 19 Feb 2014 15:11:11 -0600 Subject: [PATCH] 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 Cc: Steffen Trumtrar Signed-off-by: Mike Turquette --- drivers/clk/socfpga/clk-pll.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/drivers/clk/socfpga/clk-pll.c b/drivers/clk/socfpga/clk-pll.c index 834b6e9..88dafb5 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", ®); @@ -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; -- 2.7.4