From: Gabriel Fernandez <[email protected]> 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 <[email protected]> --- drivers/clk/clk-stm32f4.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c index 5fa5d51..b7cb359 100644 --- a/drivers/clk/clk-stm32f4.c +++ b/drivers/clk/clk-stm32f4.c @@ -216,6 +216,7 @@ enum { SYSTICK, FCLK, CLK_LSI, CLK_LSE, CLK_HSE_RTC, CLK_RTC, PLL_VCO_I2S, PLL_VCO_SAI, CLK_LCD, + CLK_I2S, END_PRIMARY_CLK }; @@ -967,6 +968,8 @@ static struct clk_hw *stm32_register_cclk(struct device *dev, const char *name, static const char *sdmux_parents[2] = { "pll48", "sys" }; +static const char *i2s_parents[2] = { "plli2s-r", NULL }; + struct stm32f4_clk_data { const struct stm32f4_gate_data *gates_data; const u64 *gates_map; @@ -1005,7 +1008,7 @@ struct stm32f4_clk_data { 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; @@ -1038,6 +1041,7 @@ static void __init stm32f4_rcc_init(struct device_node *np) stm32f4_gate_map = data->gates_map; hse_clk = of_clk_get_parent_name(np, 0); + i2s_in_clk = of_clk_get_parent_name(np, 1); clk_register_fixed_rate_with_accuracy(NULL, "hsi", NULL, 0, 16000000, 160000); @@ -1053,6 +1057,12 @@ static void __init stm32f4_rcc_init(struct device_node *np) clks[PLL_VCO_SAI] = stm32f4_rcc_register_pll(pllsrc, &data->pll_data[2], &stm32f4_clk_lock); + i2s_parents[1] = i2s_in_clk; + + clks[CLK_I2S] = clk_hw_register_mux_table(NULL, "i2s", + i2s_parents, ARRAY_SIZE(i2s_parents), 0, + base + STM32F4_RCC_CFGR, 23, 1, 0, NULL, + &stm32f4_clk_lock); sys_parents[1] = hse_clk; clk_register_mux_table( NULL, "sys", sys_parents, ARRAY_SIZE(sys_parents), 0, -- 1.9.1
