Commit 4cfcb2bf authored Feb 23, 2018 by Fabrice Gasnier Committed by Jonathan Cameron Apr 28, 2018

iio: adc: stm32-dfsdm: add check on spi-max-frequency

spi-max-frequency is requested for SPI master mode (only), to tune output
clock. It may happen requested frequency isn't reachable.
Add explicit check, so probe fails with error in this case. Otherwise,
output clock may simply be silently turned off (conversions fail).

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

parent dfa105b1

drivers/iio/adc/stm32-dfsdm-core.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -219,6 +219,11 @@ static int stm32_dfsdm_parse_of(struct platform_device *pdev,
		}

		priv->spi_clk_out_div = div_u64_rem(clk_freq, spi_freq, &rem) - 1;
		if (!priv->spi_clk_out_div) {
		/* spi_clk_out_div == 0 means ckout is OFF */
		dev_err(&pdev->dev, "spi-max-frequency not achievable\n");
		return -EINVAL;
		}
		priv->dfsdm.spi_master_freq = spi_freq;

		if (rem) {