[PATCH 3/7] iio: adc: stm32-dfsdm: fix clock source selection

[Fabrice Gasnier]

Add missing clock source selection. In case "audio" clock is provided,
it's unused currently: "dfsdm" clock is wrongly used by default.

Fixes: bed73904e76f ("IIO: ADC: add stm32 DFSDM core support")

Signed-off-by: Fabrice Gasnier <fabrice.gasn...@st.com>
---
 drivers/iio/adc/stm32-dfsdm-core.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/stm32-dfsdm-core.c 
b/drivers/iio/adc/stm32-dfsdm-core.c
index 0635f93..e50efdc 100644
--- a/drivers/iio/adc/stm32-dfsdm-core.c
+++ b/drivers/iio/adc/stm32-dfsdm-core.c
@@ -83,7 +83,7 @@ int stm32_dfsdm_start_dfsdm(struct stm32_dfsdm *dfsdm)
 {
        struct dfsdm_priv *priv = container_of(dfsdm, struct dfsdm_priv, dfsdm);
        struct device *dev = &priv->pdev->dev;
-       unsigned int clk_div = priv->spi_clk_out_div;
+       unsigned int clk_div = priv->spi_clk_out_div, clk_src;
        int ret;
 
        if (atomic_inc_return(&priv->n_active_ch) == 1) {
@@ -100,6 +100,14 @@ int stm32_dfsdm_start_dfsdm(struct stm32_dfsdm *dfsdm)
                        }
                }
 
+               /* select clock source, e.g. 0 for "dfsdm" or 1 for "audio" */
+               clk_src = priv->aclk ? 1 : 0;
+               ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),
+                                        DFSDM_CHCFGR1_CKOUTSRC_MASK,
+                                        DFSDM_CHCFGR1_CKOUTSRC(clk_src));
+               if (ret < 0)
+                       goto disable_aclk;
+
                /* Output the SPI CLKOUT (if clk_div == 0 clock if OFF) */
                ret = regmap_update_bits(dfsdm->regmap, DFSDM_CHCFGR1(0),
                                         DFSDM_CHCFGR1_CKOUTDIV_MASK,
-- 
1.9.1