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gpio: mcp23s08: Fix clearing of interrupt. 

The mcp23s18 is configurable on clearing the interrupt on either reading
INTCAP or GPIO. Since driver reads INTCAP in IRQ and not the GPIO reg need
to set control byte for this mode.

Signed-off-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Phil Reid 2016-03-15 15:46:30 +08:00 committed by Linus Walleij
parent 1cfab8f8b3
commit 3539699c03
1 changed files with 4 additions and 0 deletions
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4
drivers/gpio/gpio-mcp23s08.c
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@ -49,6 +49,7 @@
# define IOCON_HAEN (1 << 3)
# define IOCON_ODR (1 << 2)
# define IOCON_INTPOL (1 << 1)
# define IOCON_INTCC (1)
#define MCP_GPPU 0x06
#define MCP_INTF 0x07
#define MCP_INTCAP 0x08
@ -680,6 +681,9 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
if (mirror)
status |= IOCON_MIRROR | (IOCON_MIRROR << 8);
if (type == MCP_TYPE_S18)
status |= IOCON_INTCC | (IOCON_INTCC << 8);
status = mcp->ops->write(mcp, MCP_IOCON, status);
if (status < 0)
goto fail;