This is a note to let you know that I've just added the patch titled pinctrl: mcp23s08: Fix mcp23x17 precious range to the 5.4-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: pinctrl-mcp23s08-fix-mcp23x17-precious-range.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit dbb52b51b5f645106c060a0f737721734d3c2e96 Author: Thomas Preston <thomas.preston@xxxxxxxxxxxxxxx> Date: Fri Aug 28 22:32:26 2020 +0100 pinctrl: mcp23s08: Fix mcp23x17 precious range [ Upstream commit b9b7fb29433b906635231d0a111224efa009198c ] On page 23 of the datasheet [0] it says "The register remains unchanged until the interrupt is cleared via a read of INTCAP or GPIO." Include INTCAPA and INTCAPB registers in precious range, so that they aren't accidentally cleared when we read via debugfs. [0] https://ww1.microchip.com/downloads/en/DeviceDoc/20001952C.pdf Fixes: 8f38910ba4f6 ("pinctrl: mcp23s08: switch to regmap caching") Signed-off-by: Thomas Preston <thomas.preston@xxxxxxxxxxxxxxx> Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> Link: https://lore.kernel.org/r/20200828213226.1734264-3-thomas.preston@xxxxxxxxxxxxxxx Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/pinctrl/pinctrl-mcp23s08.c b/drivers/pinctrl/pinctrl-mcp23s08.c index 676ff9a4459e3..d8bcbefcba890 100644 --- a/drivers/pinctrl/pinctrl-mcp23s08.c +++ b/drivers/pinctrl/pinctrl-mcp23s08.c @@ -144,7 +144,7 @@ static const struct regmap_access_table mcp23x17_volatile_table = { }; static const struct regmap_range mcp23x17_precious_range = { - .range_min = MCP_GPIO << 1, + .range_min = MCP_INTCAP << 1, .range_max = MCP_GPIO << 1, };