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gpio: davinci: Add support for multiple GPIO controllers

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Update GPIO driver to support Multiple GPIO controllers by updating
the base of subsequent GPIO chips with total of previous chips
gpio count so that gpio_add_chip gets unique numbers.

Signed-off-by: Keerthy <[email protected]>
Reviewed-by: Grygorii Strashko <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
This commit is contained in:
Keerthy authored and Linus Walleij committed 2017-01-26 10:00:22 +01:00
1 parent b5cf3fd827
commit 8e11047b8f
2 files changed
+4 -1
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drivers/gpio/gpio-davinci.c
+3 -1
View File
@@ -186,7 +186,7 @@ static int davinci_gpio_of_xlate(struct gpio_chip *gc,
static int davinci_gpio_probe(struct platform_device *pdev)
{
static int ctrl_num;
static int ctrl_num, bank_base;
int gpio, bank;
unsigned ngpio, nbank;
struct davinci_gpio_controller *chips;
@@ -240,6 +240,7 @@ static int davinci_gpio_probe(struct platform_device *pdev)
chips->chip.set = davinci_gpio_set;
chips->chip.ngpio = ngpio;
chips->chip.base = bank_base;
#ifdef CONFIG_OF_GPIO
chips->chip.of_gpio_n_cells = 2;
@@ -248,6 +249,7 @@ static int davinci_gpio_probe(struct platform_device *pdev)
chips->chip.of_node = dev->of_node;
#endif
spin_lock_init(&chips->lock);
bank_base += ngpio;
for (gpio = 0, bank = 0; gpio < ngpio; gpio += 32, bank++)
chips->regs[bank] = gpio_base + offset_array[bank];
include/linux/platform_data/gpio-davinci.h
+1
View File
@@ -42,6 +42,7 @@ struct davinci_gpio_controller {
void __iomem *regs[MAX_REGS_BANKS];
int gpio_unbanked;
unsigned int base_irq;
unsigned int base;
};
/*