gpio: aspeed: Use ngpio property from device tree if available

Use the ngpio property from the device tree if it exists. If it doesn't
then fallback to the hardcoded value in the config.

This is in preparation for adding ast2600 support. The ast2600 SoC has
two GPIO controllers and so requires two instances of the GPIO driver.
We use the ngpio property to different between them as they have
different numbers of GPIOs.

Signed-off-by: Rashmica Gupta <rashmica.g@gmail.com>
Link: https://lore.kernel.org/r/20190906062727.13521-1-rashmica.g@gmail.com
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-aspeed.c b/drivers/gpio/gpio-aspeed.c
index 0da4cc786b993b8ab14e1804e3044914d32a1ced..f6b26f9bd28744b2726ff853d47ac88b5a36f29d 100644 (file)
--- a/drivers/gpio/gpio-aspeed.c
+++ b/drivers/gpio/gpio-aspeed.c
@@ -697,7 +697,7 @@ static void aspeed_init_irq_valid_mask(struct gpio_chip *gc,
                for_each_clear_bit(offset, &input, 32) {
                        unsigned int i = props->bank * 32 + offset;
 
-                       if (i >= gpio->config->nr_gpios)
+                       if (i >= gpio->chip.ngpio)
                                break;
 
                        clear_bit(i, valid_mask);
@@ -1010,10 +1010,10 @@ int aspeed_gpio_copro_grab_gpio(struct gpio_desc *desc,
        unsigned long flags;
 
        if (!gpio->cf_copro_bankmap)
-               gpio->cf_copro_bankmap = kzalloc(gpio->config->nr_gpios >> 3, GFP_KERNEL);
+               gpio->cf_copro_bankmap = kzalloc(gpio->chip.ngpio >> 3, GFP_KERNEL);
        if (!gpio->cf_copro_bankmap)
                return -ENOMEM;
-       if (offset < 0 || offset > gpio->config->nr_gpios)
+       if (offset < 0 || offset > gpio->chip.ngpio)
                return -EINVAL;
        bindex = offset >> 3;
 
@@ -1058,7 +1058,7 @@ int aspeed_gpio_copro_release_gpio(struct gpio_desc *desc)
        if (!gpio->cf_copro_bankmap)
                return -ENXIO;
 
-       if (offset < 0 || offset > gpio->config->nr_gpios)
+       if (offset < 0 || offset > gpio->chip.ngpio)
                return -EINVAL;
        bindex = offset >> 3;
 
@@ -1122,7 +1122,8 @@ static int __init aspeed_gpio_probe(struct platform_device *pdev)
 {
        const struct of_device_id *gpio_id;
        struct aspeed_gpio *gpio;
-       int rc, i, banks;
+       int rc, i, banks, err;
+       u32 ngpio;
 
        gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
        if (!gpio)
@@ -1148,7 +1149,10 @@ static int __init aspeed_gpio_probe(struct platform_device *pdev)
        gpio->config = gpio_id->data;
 
        gpio->chip.parent = &pdev->dev;
-       gpio->chip.ngpio = gpio->config->nr_gpios;
+       err = of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpio);
+       gpio->chip.ngpio = (u16) ngpio;
+       if (err)
+               gpio->chip.ngpio = gpio->config->nr_gpios;
        gpio->chip.direction_input = aspeed_gpio_dir_in;
        gpio->chip.direction_output = aspeed_gpio_dir_out;
        gpio->chip.get_direction = aspeed_gpio_get_direction;
@@ -1161,7 +1165,7 @@ static int __init aspeed_gpio_probe(struct platform_device *pdev)
        gpio->chip.base = -1;
 
        /* Allocate a cache of the output registers */
-       banks = DIV_ROUND_UP(gpio->config->nr_gpios, 32);
+       banks = DIV_ROUND_UP(gpio->chip.ngpio, 32);
        gpio->dcache = devm_kcalloc(&pdev->dev,
                                    banks, sizeof(u32), GFP_KERNEL);
        if (!gpio->dcache)