gpio: mpc8xxx: simplify ls1028a/ls1088a support

Some Layerscape/QoriQ SoCs have input buffers which needs to be enabled
first. This was done in two different ways in the driver. Unify it.

This was tested on a LS1028A SoC.

Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index 1e86652..6dfca83 100644 (file)
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -47,27 +47,6 @@ struct mpc8xxx_gpio_chip {
        unsigned int irqn;
 };
 
-/* The GPIO Input Buffer Enable register(GPIO_IBE) is used to
- * control the input enable of each individual GPIO port.
- * When an individual GPIO port’s direction is set to
- * input (GPIO_GPDIR[DRn=0]), the associated input enable must be
- * set (GPIOxGPIE[IEn]=1) to propagate the port value to the GPIO
- * Data Register.
- */
-static int ls1028a_gpio_dir_in_init(struct gpio_chip *gc)
-{
-       unsigned long flags;
-       struct mpc8xxx_gpio_chip *mpc8xxx_gc = gpiochip_get_data(gc);
-
-       spin_lock_irqsave(&gc->bgpio_lock, flags);
-
-       gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
-
-       spin_unlock_irqrestore(&gc->bgpio_lock, flags);
-
-       return 0;
-}
-
 /*
  * This hardware has a big endian bit assignment such that GPIO line 0 is
  * connected to bit 31, line 1 to bit 30 ... line 31 to bit 0.
@@ -283,7 +262,6 @@ static const struct irq_domain_ops mpc8xxx_gpio_irq_ops = {
 };
 
 struct mpc8xxx_gpio_devtype {
-       int (*gpio_dir_in_init)(struct gpio_chip *chip);
        int (*gpio_dir_out)(struct gpio_chip *, unsigned int, int);
        int (*gpio_get)(struct gpio_chip *, unsigned int);
        int (*irq_set_type)(struct irq_data *, unsigned int);
@@ -294,11 +272,6 @@ static const struct mpc8xxx_gpio_devtype mpc512x_gpio_devtype = {
        .irq_set_type = mpc512x_irq_set_type,
 };
 
-static const struct mpc8xxx_gpio_devtype ls1028a_gpio_devtype = {
-       .gpio_dir_in_init = ls1028a_gpio_dir_in_init,
-       .irq_set_type = mpc8xxx_irq_set_type,
-};
-
 static const struct mpc8xxx_gpio_devtype mpc5125_gpio_devtype = {
        .gpio_dir_out = mpc5125_gpio_dir_out,
        .irq_set_type = mpc512x_irq_set_type,
@@ -319,8 +292,8 @@ static const struct of_device_id mpc8xxx_gpio_ids[] = {
        { .compatible = "fsl,mpc5121-gpio", .data = &mpc512x_gpio_devtype, },
        { .compatible = "fsl,mpc5125-gpio", .data = &mpc5125_gpio_devtype, },
        { .compatible = "fsl,pq3-gpio",     },
-       { .compatible = "fsl,ls1028a-gpio", .data = &ls1028a_gpio_devtype, },
-       { .compatible = "fsl,ls1088a-gpio", .data = &ls1028a_gpio_devtype, },
+       { .compatible = "fsl,ls1028a-gpio", },
+       { .compatible = "fsl,ls1088a-gpio", },
        { .compatible = "fsl,qoriq-gpio",   },
        {}
 };
@@ -389,7 +362,16 @@ static int mpc8xxx_probe(struct platform_device *pdev)
 
        gc->to_irq = mpc8xxx_gpio_to_irq;
 
-       if (of_device_is_compatible(np, "fsl,qoriq-gpio"))
+       /*
+        * The GPIO Input Buffer Enable register(GPIO_IBE) is used to control
+        * the input enable of each individual GPIO port.  When an individual
+        * GPIO port’s direction is set to input (GPIO_GPDIR[DRn=0]), the
+        * associated input enable must be set (GPIOxGPIE[IEn]=1) to propagate
+        * the port value to the GPIO Data Register.
+        */
+       if (of_device_is_compatible(np, "fsl,qoriq-gpio") ||
+           of_device_is_compatible(np, "fsl,ls1028a-gpio") ||
+           of_device_is_compatible(np, "fsl,ls1088a-gpio"))
                gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
 
        ret = gpiochip_add_data(gc, mpc8xxx_gc);
@@ -411,9 +393,6 @@ static int mpc8xxx_probe(struct platform_device *pdev)
        /* ack and mask all irqs */
        gc->write_reg(mpc8xxx_gc->regs + GPIO_IER, 0xffffffff);
        gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR, 0);
-       /* enable input buffer  */
-       if (devtype->gpio_dir_in_init)
-               devtype->gpio_dir_in_init(gc);
 
        ret = devm_request_irq(&pdev->dev, mpc8xxx_gc->irqn,
                               mpc8xxx_gpio_irq_cascade,