Patch "iio: hi8435: cleanup reset gpio" has been added to the 4.9-stable tree

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

iio: hi8435: cleanup reset gpio

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:

     iio-hi8435-cleanup-reset-gpio.patch

and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Nikita Yushchenko <[email protected]>
Date: Fri, 19 May 2017 17:48:02 +0300
Subject: iio: hi8435: cleanup reset gpio

From: Nikita Yushchenko <[email protected]>

[ Upstream commit 61305664a542f874283f74bf0b27ddb31f5045d7 ]

Reset GPIO is active low.

Currently driver uses gpiod_set_value(1) to clean reset, which depends on device tree to contain GPIO_ACTIVE_HIGH - that does not match reality.

This fixes driver to use _raw version of gpiod_set_value() to enforce active-low semantics despite of what's written in device tree. Allowing device tree to override that only opens possibility for errors and does not add any value.

Additionally, use _cansleep version to make things work with i2c-gpio and other sleeping gpio drivers.

---
 drivers/iio/adc/hi8435.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

@@ -453,13 +453,15 @@ static int hi8435_probe(struct spi_devic
 	priv->spi = spi;
 
 	reset_gpio = devm_gpiod_get(&spi->dev, NULL, GPIOD_OUT_LOW);
-	if (IS_ERR(reset_gpio)) {
-		/* chip s/w reset if h/w reset failed */
+	if (!IS_ERR(reset_gpio)) {
+		/* need >=100ns low pulse to reset chip */
+		gpiod_set_raw_value_cansleep(reset_gpio, 0);
+		udelay(1);
+		gpiod_set_raw_value_cansleep(reset_gpio, 1);
+	} else {
+		/* s/w reset chip if h/w reset is not available */
 		hi8435_writeb(priv, HI8435_CTRL_REG, HI8435_CTRL_SRST);
 		hi8435_writeb(priv, HI8435_CTRL_REG, 0);
-	} else {
-		udelay(5);
-		gpiod_set_value(reset_gpio, 1);
 	}
 
 	spi_set_drvdata(spi, idev);

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/iio-hi8435-avoid-garbage-event-at-first-enable.patch queue-4.9/iio-hi8435-cleanup-reset-gpio.patch