This is a note to let you know that I've just added the patch titled

iio: adc: ti-ads7950: Ensure CS is deasserted after reading channels

to my staging git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git in the staging-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 9898cb24e454602beb6e17bacf9f97b26c85c955 Mon Sep 17 00:00:00 2001

From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= u.kleine-koenig@pengutronix.de Date: Fri, 9 Jul 2021 12:11:10 +0200 Subject: iio: adc: ti-ads7950: Ensure CS is deasserted after reading channels MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

The ADS7950 requires that CS is deasserted after each SPI word. Before commit e2540da86ef8 ("iio: adc: ti-ads7950: use SPI_CS_WORD to reduce CPU usage") the driver used a message with one spi transfer per channel where each but the last one had .cs_change set to enforce a CS toggle. This was wrongly translated into a message with a single transfer and .cs_change set which results in a CS toggle after each word but the last which corrupts the first adc conversion of all readouts after the first readout.

Fixes: e2540da86ef8 ("iio: adc: ti-ads7950: use SPI_CS_WORD to reduce CPU usage") Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de Reviewed-by: David Lechner david@lechnology.com Tested-by: David Lechner david@lechnology.com Cc: Stable@vger.kernel.org Link: https://lore.kernel.org/r/20210709101110.1814294-1-u.kleine-koenig@pengutron... Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com --- drivers/iio/adc/ti-ads7950.c | 1 - 1 file changed, 1 deletion(-)

diff --git a/drivers/iio/adc/ti-ads7950.c b/drivers/iio/adc/ti-ads7950.c index 2383eacada87..a2b83f0bd526 100644 --- a/drivers/iio/adc/ti-ads7950.c +++ b/drivers/iio/adc/ti-ads7950.c @@ -568,7 +568,6 @@ static int ti_ads7950_probe(struct spi_device *spi) st->ring_xfer.tx_buf = &st->tx_buf[0]; st->ring_xfer.rx_buf = &st->rx_buf[0]; /* len will be set later */ - st->ring_xfer.cs_change = true;

spi_message_add_tail(&st->ring_xfer, &st->ring_msg);