gpio: rcar: Add more register documentation

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index e67d578..d96166c 100644 (file)
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -39,18 +39,18 @@ struct gpio_rcar_priv {
        struct irq_chip irq_chip;
 };
 
-#define IOINTSEL 0x00
-#define INOUTSEL 0x04
-#define OUTDT 0x08
-#define INDT 0x0c
-#define INTDT 0x10
-#define INTCLR 0x14
-#define INTMSK 0x18
-#define MSKCLR 0x1c
-#define POSNEG 0x20
-#define EDGLEVEL 0x24
-#define FILONOFF 0x28
-#define BOTHEDGE 0x4c
+#define IOINTSEL 0x00  /* General IO/Interrupt Switching Register */
+#define INOUTSEL 0x04  /* General Input/Output Switching Register */
+#define OUTDT 0x08     /* General Output Register */
+#define INDT 0x0c      /* General Input Register */
+#define INTDT 0x10     /* Interrupt Display Register */
+#define INTCLR 0x14    /* Interrupt Clear Register */
+#define INTMSK 0x18    /* Interrupt Mask Register */
+#define MSKCLR 0x1c    /* Interrupt Mask Clear Register */
+#define POSNEG 0x20    /* Positive/Negative Logic Select Register */
+#define EDGLEVEL 0x24  /* Edge/level Select Register */
+#define FILONOFF 0x28  /* Chattering Prevention On/Off Register */
+#define BOTHEDGE 0x4c  /* One Edge/Both Edge Select Register */
 
 #define RCAR_MAX_GPIO_PER_BANK         32