From: Gabriel Fernandez <gabriel.fernandez@xxxxxx>
This patch adds post dividers of I2S & SAI PLLs.
These dividers are managed by a dedicated register (RCC_DCKCFGR).
The PLL should be off before a set rate.
Signed-off-by: Gabriel Fernandez <gabriel.fernandez@xxxxxx>
---
drivers/clk/clk-stm32f4.c | 42 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
index c2b62cc..98856ac 100644
--- a/drivers/clk/clk-stm32f4.c
+++ b/drivers/clk/clk-stm32f4.c
@@ -47,6 +47,7 @@
#define STM32F4_RCC_CSR 0x74
#define STM32F4_RCC_PLLI2SCFGR 0x84
#define STM32F4_RCC_PLLSAICFGR 0x88
+#define STM32F4_RCC_DCKCFGR 0x8c
struct stm32f4_gate_data {
u8 offset;
@@ -357,6 +358,18 @@ struct stm32f4_pll {
#define to_stm32f4_pll(_gate) container_of(_gate, struct stm32f4_pll, gate)
+struct stm32f4_pll_post_div_data {
+ u8 pll_num;
+ const char *name;
+ const char *parent;
+ u8 flag;
+ u8 offset;
+ u8 shift;
+ u8 width;
+ u8 flag_div;
+ const struct clk_div_table *div_table;
+};
+
struct stm32f4_vco_data {
const char *vco_name;
u8 offset;
@@ -370,6 +383,18 @@ struct stm32f4_vco_data {
{ "vco-sai", STM32F4_RCC_PLLSAICFGR, 28, 29 },
};
+#define MAX_POST_DIV 3
+static const struct stm32f4_pll_post_div_data post_div_data[MAX_POST_DIV] = {
+ { PLL_I2S, "plli2s-q-div", "plli2s-q", CLK_SET_RATE_PARENT,
+ STM32F4_RCC_DCKCFGR, 0, 5, 0, NULL},
+
+ { PLL_SAI, "pllsai-q-div", "pllsai-q", CLK_SET_RATE_PARENT,
+ STM32F4_RCC_DCKCFGR, 8, 5, 0, NULL },
+
+ { PLL_SAI, "pllsai-r-div", "pllsai-r", CLK_SET_RATE_PARENT,
+ STM32F4_RCC_DCKCFGR, 16, 2, CLK_DIVIDER_POWER_OF_TWO},
+};
+
struct stm32f4_div_data {
u8 shift;
u8 width;
@@ -996,6 +1021,23 @@ static void __init stm32f4_rcc_init(struct device_node *np)
clks[PLL_VCO_SAI] = stm32f4_rcc_register_pll("vco_in",
&data->pll_data[2], &stm32f4_clk_lock);
+ for (n = 0; n < MAX_POST_DIV; n++) {
+ const struct stm32f4_pll_post_div_data *post_div;
+
+ post_div = &post_div_data[n];
+
+ clk_register_pll_div(post_div->name,
+ post_div->parent,
+ post_div->flag,
+ base + post_div->offset,
+ post_div->shift,
+ post_div->width,
+ post_div->flag_div,
+ post_div->div_table,
+ clks[post_div->pll_num],
+ &stm32f4_clk_lock);
+ }
+
sys_parents[1] = hse_clk;
clk_register_mux_table(
NULL, "sys", sys_parents, ARRAY_SIZE(sys_parents), 0,
--
1.9.1
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