[Letux-kernel] [PATCH v5 4/7] gpio: pca953x: define masks for addressing common and extended registers

H. Nikolaus Schaller hns at goldelico.com
Sat Apr 28 18:31:34 CEST 2018

These mask bits are to be used to map the extended register
addreseses (which are defined for an unsupported 8-bit pcal chip)
to 16 and 24 bit chips (pcal6524).

Signed-off-by: H. Nikolaus Schaller <hns at goldelico.com>
 drivers/gpio/gpio-pca953x.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 2b667166e855..fc863faa3ce4 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -56,6 +56,9 @@
 #define PCAL6524_DEBOUNCE	0x2d
 #define PCA_GPIO_MASK		0x00FF
+#define PCAL_GPIO_MASK		GENMASK(4, 0)
 #define PCA_INT			0x0100
 #define PCA_PCAL		0x0200

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