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clk: socfpga: Support multiple parents for the pll clocks

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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>
This commit is contained in:
Dinh Nguyen 2014-02-19 15:11:11 -06:00 committed by Mike Turquette
parent 5585f73175
commit b89cd950cb
1 changed files with 22 additions and 4 deletions
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26
drivers/clk/socfpga/clk-pll.c
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@ -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;