[PATCH] add amlogic gpio to irq

[linsheng_111]

From: Lin shenghuan <linsheng_...@163.com>

---
 drivers/pinctrl/meson/pinctrl-meson.c | 36 +++++++++++++++++++++++++++++++++++
 drivers/pinctrl/meson/pinctrl-meson.h |  1 +
 2 files changed, 37 insertions(+)

diff --git a/drivers/pinctrl/meson/pinctrl-meson.c 
b/drivers/pinctrl/meson/pinctrl-meson.c
index 20683cd..b91ff2c 100644
--- a/drivers/pinctrl/meson/pinctrl-meson.c
+++ b/drivers/pinctrl/meson/pinctrl-meson.c
@@ -51,6 +51,7 @@
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/seq_file.h>
+#include <linux/of_irq.h>
 
 #include "../core.h"
 #include "../pinctrl-utils.h"
@@ -598,6 +599,34 @@ static int meson_gpio_get(struct gpio_chip *chip, unsigned 
gpio)
        return !!(val & BIT(bit));
 }
 
+static int meson_gpio_to_irq(struct gpio_chip *chip, unsigned int gpio)
+{
+       struct meson_pinctrl *pc = gpiochip_get_data(chip);
+       struct meson_bank *bank;
+       struct irq_fwspec fwspec;
+       int hwirq;
+
+       if (meson_get_bank(pc, gpio, &bank))
+               return -EINVAL;
+
+       if (bank->irq_first < 0) {
+               dev_warn(pc->dev, "no support irq for pin[%d]\n", gpio);
+               return -EINVAL;
+       }
+       if (!pc->of_irq) {
+               dev_err(pc->dev, "invalid device node of gpio INTC\n");
+               return -EINVAL;
+       }
+
+       hwirq = gpio - bank->first + bank->irq_first;
+       fwspec.fwnode = of_node_to_fwnode(pc->of_irq);
+       fwspec.param_count = 2;
+       fwspec.param[0] = hwirq;
+       fwspec.param[1] = IRQ_TYPE_NONE;
+
+       return irq_create_fwspec_mapping(&fwspec);
+}
+
 static int meson_gpiolib_register(struct meson_pinctrl *pc)
 {
        int ret;
@@ -612,6 +641,7 @@ static int meson_gpiolib_register(struct meson_pinctrl *pc)
        pc->chip.direction_output = meson_gpio_direction_output;
        pc->chip.get = meson_gpio_get;
        pc->chip.set = meson_gpio_set;
+       pc->chip.to_irq = meson_gpio_to_irq;
        pc->chip.base = -1;
        pc->chip.ngpio = pc->data->num_pins;
        pc->chip.can_sleep = false;
@@ -682,6 +712,12 @@ static int meson_pinctrl_parse_dt(struct meson_pinctrl *pc,
 
        pc->of_node = gpio_np;
 
+       pc->of_irq = of_find_compatible_node(NULL,
+                       NULL, "amlogic,meson-gpio-intc");
+       if (!pc->of_irq)
+               pc->of_irq = of_find_compatible_node(NULL,
+                       NULL, "amlogic,meson-gpio-intc-ext");
+
        pc->reg_mux = meson_map_resource(pc, gpio_np, "mux");
        if (IS_ERR_OR_NULL(pc->reg_mux)) {
                dev_err(pc->dev, "mux registers not found\n");
diff --git a/drivers/pinctrl/meson/pinctrl-meson.h 
b/drivers/pinctrl/meson/pinctrl-meson.h
index f8b0ff9..0f808bb 100644
--- a/drivers/pinctrl/meson/pinctrl-meson.h
+++ b/drivers/pinctrl/meson/pinctrl-meson.h
@@ -131,6 +131,7 @@ struct meson_pinctrl {
        struct regmap *reg_ds;
        struct gpio_chip chip;
        struct device_node *of_node;
+       struct device_node *of_irq;
 };
 
 #define FUNCTION(fn)                                                   \
-- 
2.7.4