[PATCH v2 1/3] gio: add support for PCAL6408 chip to the pca953x driver

[Michael Kopfensteiner <michael.kopfensteiner@vahle.com>]

The PCAL6408 chip similar enough to the PCA95xx chip series such that
it can be handled by the pca953x driver as well.

This solution is copied from the linux kernel's pca953x driver.

Signed-off-by: Michael Kopfensteiner <michael.kopfensteiner@vahle.com>
---
 drivers/gpio/gpio-pca953x.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 4633d4f15d..2d3f8a8871 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -37,6 +37,8 @@
 
 #define PCA_GPIO_MASK		0x00FF
 #define PCA_INT			0x0100
+#define PCA_PCAL		0x0200
+#define PCA_LATCH_INT		(PCA_PCAL | PCA_INT)
 #define PCA953X_TYPE		0x1000
 #define PCA957X_TYPE		0x2000
 
@@ -56,6 +58,8 @@ static struct platform_device_id pca953x_id[] = {
 	{ "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
 	{ "pca9698", 40 | PCA953X_TYPE, },
 
+	{ "pcal6408", 8 | PCA953X_TYPE | PCA_LATCH_INT, },
+
 	{ "max7310", 8  | PCA953X_TYPE, },
 	{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
 	{ "max7313", 16 | PCA953X_TYPE | PCA_INT, },
@@ -483,6 +487,8 @@ static const struct of_device_id pca953x_dt_ids[] = {
 	{ .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
 	{ .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
 
+	{ .compatible = "nxp,pcal6408", .data = OF_953X(8, PCA_LATCH_INT), },
+
 	{ .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
 	{ .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
 	{ .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
-- 
2.30.2