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

Fabrice Gasnier
2018-02-23T12:50:57Z

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.gasnier@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