[PATCH v2 4/5] gpio: loongson1: Add DT support

From: Keguang Zhang
Date: Thu Mar 02 2023 - 07:53:21 EST


This patch adds DT support for Loongson-1 GPIO driver.

Signed-off-by: Keguang Zhang <keguang.zhang@xxxxxxxxx>
---
V1 -> V2: Let gpiolib parse ngpios property
Remove unnecessary alias id parsing
Remove superfluous initialization done by bgpio_init()
Add MODULE_DEVICE_TABLE()
Other minor fixes
---
drivers/gpio/gpio-loongson1.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-loongson1.c b/drivers/gpio/gpio-loongson1.c
index 3ac9e49e7efb..94ac0ccb450f 100644
--- a/drivers/gpio/gpio-loongson1.c
+++ b/drivers/gpio/gpio-loongson1.c
@@ -68,25 +68,38 @@ static int ls1x_gpio_probe(struct platform_device *pdev)
ls1x_gc->gc.owner = THIS_MODULE;
ls1x_gc->gc.request = ls1x_gpio_request;
ls1x_gc->gc.free = ls1x_gpio_free;
- ls1x_gc->gc.base = pdev->id * 32;
+ /*
+ * Clear ngpio to let gpiolib get the correct number
+ * by reading ngpios property
+ */
+ ls1x_gc->gc.ngpio = 0;

ret = devm_gpiochip_add_data(dev, &ls1x_gc->gc, ls1x_gc);
if (ret)
goto err;

platform_set_drvdata(pdev, ls1x_gc);
- dev_info(dev, "Loongson1 GPIO driver registered\n");
+
+ dev_info(dev, "GPIO controller registered with %d pins\n",
+ ls1x_gc->gc.ngpio);

return 0;
err:
- dev_err(dev, "failed to register GPIO device\n");
+ dev_err(dev, "failed to register GPIO controller\n");
return ret;
}

+static const struct of_device_id ls1x_gpio_dt_ids[] = {
+ { .compatible = "loongson,ls1x-gpio" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ls1x_gpio_dt_ids);
+
static struct platform_driver ls1x_gpio_driver = {
.probe = ls1x_gpio_probe,
.driver = {
.name = "ls1x-gpio",
+ .of_match_table = ls1x_gpio_dt_ids,
},
};

--
2.34.1