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pinctrl: mcp23s08: Fix mcp23x17 precious range 

[ Upstream commit b9b7fb2943 ]

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: 8f38910ba4 ("pinctrl: mcp23s08: switch to regmap caching")
Signed-off-by: Thomas Preston <thomas.preston@codethink.co.uk>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20200828213226.1734264-3-thomas.preston@codethink.co.uk
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Thomas Preston 2020-08-28 22:32:26 +01:00 committed by Greg Kroah-Hartman
parent 5e829cdd6d
commit 50185a14fe
1 changed files with 1 additions and 1 deletions
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drivers/pinctrl/pinctrl-mcp23s08.c
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@ -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,
};