gpio: xlp: Convert to use gpiolib irqchip helpers

commit "325f0a (MIPS: Netlogic: Use chip_data for irq_chip methods)"
Updates "mips/netlogic/common/irq.c" to use chip_data to store interrupt
controller data pointer. Before this commit handler_data was used to
store interrupt controller data which caused errors while using
gpiochip_set_chained_irqchip.

Update XLP GPIO driver to use the gpiolib irqchip helpers.
And add missing depends on OF_GPIO in Kconfig.

Signed-off-by: Kamlakant Patel <kamlakant.patel@broadcom.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2 files changed, 12 insertions, 11 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 597b8d4ab74f..77a796d2f9e1 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -512,7 +512,7 @@ config GPIO_XILINX
 
 config GPIO_XLP
         tristate "Netlogic XLP GPIO support"
-        depends on CPU_XLP
+        depends on CPU_XLP && OF_GPIO
         select GPIOLIB_IRQCHIP
         help
           This driver provides support for GPIO interface on Netlogic XLP MIPS64
diff --git a/drivers/gpio/gpio-xlp.c b/drivers/gpio/gpio-xlp.c
index e02499a15e72..bc06a2cd2c1d 100644
--- a/drivers/gpio/gpio-xlp.c
+++ b/drivers/gpio/gpio-xlp.c
@@ -18,6 +18,7 @@
 #include <linux/module.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
+#include <linux/irqchip/chained_irq.h>
 
 /*
  * XLP GPIO has multiple 32 bit registers for each feature where each register
@@ -208,25 +209,28 @@ static struct irq_chip xlp_gpio_irq_chip = {
         .flags          = IRQCHIP_ONESHOT_SAFE,
 };
 
-static irqreturn_t xlp_gpio_generic_handler(int irq, void *data)
+static void xlp_gpio_generic_handler(struct irq_desc *desc)
 {
-        struct xlp_gpio_priv *priv = data;
+        struct xlp_gpio_priv *priv = irq_desc_get_handler_data(desc);
+        struct irq_chip *irqchip = irq_desc_get_chip(desc);
         int gpio, regoff;
         u32 gpio_stat;
 
         regoff = -1;
         gpio_stat = 0;
+
+        chained_irq_enter(irqchip, desc);
         for_each_set_bit(gpio, priv->gpio_enabled_mask, XLP_MAX_NR_GPIO) {
                 if (regoff != gpio / XLP_GPIO_REGSZ) {
                         regoff = gpio / XLP_GPIO_REGSZ;
                         gpio_stat = readl(priv->gpio_intr_stat + regoff * 4);
                 }
+
                 if (gpio_stat & BIT(gpio % XLP_GPIO_REGSZ))
                         generic_handle_irq(irq_find_mapping(
                                                 priv->chip.irqdomain, gpio));
         }
-
-        return IRQ_HANDLED;
+        chained_irq_exit(irqchip, desc);
 }
 
 static int xlp_gpio_dir_output(struct gpio_chip *gc, unsigned gpio, int state)
@@ -378,12 +382,6 @@ static int xlp_gpio_probe(struct platform_device *pdev)
         gc->get = xlp_gpio_get;
 
         spin_lock_init(&priv->lock);
-
-        err = devm_request_irq(&pdev->dev, irq, xlp_gpio_generic_handler,
-                        IRQ_TYPE_NONE, pdev->name, priv);
-        if (err)
-                return err;
-
         irq_base = irq_alloc_descs(-1, XLP_GPIO_IRQ_BASE, gc->ngpio, 0);
         if (irq_base < 0) {
                 dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
@@ -401,6 +399,9 @@ static int xlp_gpio_probe(struct platform_device *pdev)
                 goto out_gpio_remove;
         }
 
+        gpiochip_set_chained_irqchip(gc, &xlp_gpio_irq_chip, irq,
+                        xlp_gpio_generic_handler);
+
         dev_info(&pdev->dev, "registered %d GPIOs\n", gc->ngpio);
 
         return 0;