ARM: at91/gpio: change comments and one variable name

What was true only on at91sam9263 about the sharing of a single AIC
IRQ line for several GPIO banks is now used by several Atmel SoCs.

Change a variable name to allow better understanding while
introducing IRQ domains in following patches.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

1 files changed, 14 insertions, 11 deletions

diff --git a/arch/arm/mach-at91/gpio.c b/arch/arm/mach-at91/gpio.c
index 74d6783eeabb..b762afc4ec17 100644
--- a/arch/arm/mach-at91/gpio.c
+++ b/arch/arm/mach-at91/gpio.c
@@ -29,8 +29,8 @@
 struct at91_gpio_chip {
         struct gpio_chip        chip;
         struct at91_gpio_chip   *next;          /* Bank sharing same clock */
-        int                     id;             /* ID of register bank */
-        void __iomem            *regbase;       /* Base of register bank */
+        int                     pioc_hwirq;     /* PIO bank interrupt identifier on AIC */
+        void __iomem            *regbase;       /* PIO bank virtual address */
         struct clk              *clock;         /* associated clock */
 };
 
@@ -285,7 +285,7 @@ static int gpio_irq_set_wake(struct irq_data *d, unsigned state)
         else
                 wakeups[bank] &= ~mask;
 
-        irq_set_irq_wake(gpio_chip[bank].id, state);
+        irq_set_irq_wake(gpio_chip[bank].pioc_hwirq, state);
 
         return 0;
 }
@@ -499,7 +499,7 @@ void __init at91_gpio_irq_setup(void)
         for (pioc = 0, this = gpio_chip, prev = NULL;
                         pioc++ < gpio_banks;
                         prev = this, this++) {
-                unsigned        id = this->id;
+                unsigned        pioc_hwirq = this->pioc_hwirq;
                 unsigned        i;
 
                 __raw_writel(~0, this->regbase + PIO_IDR);
@@ -518,14 +518,14 @@ void __init at91_gpio_irq_setup(void)
                 }
 
                 /* The toplevel handler handles one bank of GPIOs, except
-                 * AT91SAM9263_ID_PIOCDE handles three... PIOC is first in
-                 * the list, so we only set up that handler.
+                 * on some SoC it can handles up to three...
+                 * We only set up the handler for the first of the list.
                  */
                 if (prev && prev->next == this)
                         continue;
 
-                irq_set_chip_data(id, this);
-                irq_set_chained_handler(id, gpio_irq_handler);
+                irq_set_chip_data(pioc_hwirq, this);
+                irq_set_chained_handler(pioc_hwirq, gpio_irq_handler);
         }
         pr_info("AT91: %d gpio irqs in %d banks\n", irq - gpio_to_irq(0), gpio_banks);
 }
@@ -615,7 +615,7 @@ void __init at91_gpio_init(struct at91_gpio_bank *data, int nr_banks)
         for (i = 0; i < nr_banks; i++) {
                 at91_gpio = &gpio_chip[i];
 
-                at91_gpio->id = data[i].id;
+                at91_gpio->pioc_hwirq = data[i].pioc_hwirq;
                 at91_gpio->chip.base = i * 32;
 
                 at91_gpio->regbase = ioremap(data[i].regbase, 512);
@@ -633,8 +633,11 @@ void __init at91_gpio_init(struct at91_gpio_bank *data, int nr_banks)
                 /* enable PIO controller's clock */
                 clk_enable(at91_gpio->clock);
 
-                /* AT91SAM9263_ID_PIOCDE groups PIOC, PIOD, PIOE */
-                if (last && last->id == at91_gpio->id)
+                /*
+                 * GPIO controller are grouped on some SoC:
+                 * PIOC, PIOD and PIOE can share the same IRQ line
+                 */
+                if (last && last->pioc_hwirq == at91_gpio->pioc_hwirq)
                         last->next = at91_gpio;
                 last = at91_gpio;