From: Gabriel Fernandez <gabriel.fernan...@st.com>

This patch introduces I2S clock for stm32f4 soc.
The I2S clock could be derived from an external clock or from pll-i2s

Signed-off-by: Gabriel Fernandez <gabriel.fernan...@st.com>
---
 drivers/clk/clk-stm32f4.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
index 86244fc..3063b30 100644
--- a/drivers/clk/clk-stm32f4.c
+++ b/drivers/clk/clk-stm32f4.c
@@ -935,6 +935,8 @@ static struct clk_hw *stm32_register_cclk(struct device 
*dev, const char *name,
 
 static const char *lcd_parent[1] = { "pllsai-r-div" };
 
+static const char *i2s_parents[2] = { "plli2s-r", NULL };
+
 struct stm32_aux_clk {
        int idx;
        const char *name;
@@ -969,6 +971,12 @@ struct stm32f4_clk_data {
                STM32F4_RCC_APB2ENR, 26,
                CLK_SET_RATE_PARENT
        },
+       {
+               CLK_I2S, "i2s", i2s_parents, ARRAY_SIZE(i2s_parents),
+               STM32F4_RCC_CFGR, 23, 1,
+               NO_GATE, 0,
+               CLK_SET_RATE_PARENT
+       },
 };
 
 static const struct stm32f4_clk_data stm32f429_clk_data = {
@@ -1063,7 +1071,7 @@ static struct clk_hw *stm32_register_aux_clk(const char 
*name,
 
 static void __init stm32f4_rcc_init(struct device_node *np)
 {
-       const char *hse_clk;
+       const char *hse_clk, *i2s_in_clk;
        int n;
        const struct of_device_id *match;
        const struct stm32f4_clk_data *data;
@@ -1098,6 +1106,10 @@ static void __init stm32f4_rcc_init(struct device_node 
*np)
 
        hse_clk = of_clk_get_parent_name(np, 0);
 
+       i2s_in_clk = of_clk_get_parent_name(np, 1);
+
+       i2s_parents[1] = i2s_in_clk;
+
        clk_register_fixed_rate_with_accuracy(NULL, "hsi", NULL, 0,
                        16000000, 160000);
        pllcfgr = readl(base + STM32F4_RCC_PLLCFGR);
-- 
1.9.1

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