From: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> This patch adds a max frequency check at the beginning of ad2s90_probe function so that when it is set to a value above 0.83Mhz, dev_err is called with an appropriate message and -EINVAL is returned. The defined limit is 0.83Mhz instead of 2Mhz, which is the chip's max frequency as specified in the datasheet, because, as also specified in the datasheet, a 600ns delay is expected between the application of a logic LO to CS and the application of SCLK. Since the delay is not implemented in the spi code, to satisfy it, SCLK's period should be at most 2 * 600ns, so the max frequency should be 1 / (2 * 6e-7), which gives roughly 830000Hz. Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> Signed-off-by: Matheus Tavares <matheus.bernardino@xxxxxx> --- Changes in v2: - Correctly credit Alexandru as the patch's author drivers/staging/iio/resolver/ad2s90.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/staging/iio/resolver/ad2s90.c b/drivers/staging/iio/resolver/ad2s90.c index 913d6fad2d4d..fe90f2056bff 100644 --- a/drivers/staging/iio/resolver/ad2s90.c +++ b/drivers/staging/iio/resolver/ad2s90.c @@ -19,6 +19,12 @@ #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> +/* + * Although chip's max frequency is 2Mhz, it needs 600ns between CS and the + * first falling edge of SCLK, so frequency should be at most 1 / (2 * 6e-7) + */ +#define AD2S90_MAX_SPI_FREQ_HZ 830000 + struct ad2s90_state { struct mutex lock; struct spi_device *sdev; @@ -78,6 +84,12 @@ static int ad2s90_probe(struct spi_device *spi) struct iio_dev *indio_dev; struct ad2s90_state *st; + if (spi->max_speed_hz > AD2S90_MAX_SPI_FREQ_HZ) { + dev_err(&spi->dev, "SPI CLK, %d Hz exceeds %d Hz\n", + spi->max_speed_hz, AD2S90_MAX_SPI_FREQ_HZ); + return -EINVAL; + } + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); if (!indio_dev) return -ENOMEM; -- 2.18.0 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel