pinctrl: samsung: Use per-bank IRQ domain for wake-up interrupts

This patch reworks wake-up interrupt handling in pinctrl-exynos driver,
so each pin bank, which provides wake-up interrupts, has its own IRQ
domain.

Information about whether given pin bank provides wake-up interrupts,
how many and whether they are separate or muxed are parsed from device
tree.

It gives following advantages:
  - interrupts can be specified in device tree in a more readable way,
    e.g. :
    	device {
		/* ... */
		interrupt-parent = <&gpx2>;
		interrupts = <4 0>;
		/* ... */
	};
  - the amount and layout of interrupts is not hardcoded in the code
    anymore, but defined in SoC-specific structure
  - bank and pin of each wake-up interrupt can be easily identified, to
    allow operations, such as setting the pin to EINT function, from
    irq_set_type() callback

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 26 insertions, 3 deletions

diff --git a/drivers/pinctrl/pinctrl-exynos.h b/drivers/pinctrl/pinctrl-exynos.h
index f05efa074658..0a708890d8b4 100644
--- a/drivers/pinctrl/pinctrl-exynos.h
+++ b/drivers/pinctrl/pinctrl-exynos.h
@@ -73,13 +73,36 @@
                 .name           = id                    \
         }
 
+#define EXYNOS_PIN_BANK_EINTW(pins, reg, id, offs)      \
+        {                                               \
+                .pctl_offset    = reg,                  \
+                .nr_pins        = pins,                 \
+                .func_width     = 4,                    \
+                .pud_width      = 2,                    \
+                .drv_width      = 2,                    \
+                .eint_type      = EINT_TYPE_WKUP,       \
+                .eint_offset    = offs,                 \
+                .name           = id                    \
+        }
+
 /**
  * struct exynos_weint_data: irq specific data for all the wakeup interrupts
  * generated by the external wakeup interrupt controller.
- * @domain: irq domain representing the external wakeup interrupts
  * @irq: interrupt number within the domain.
+ * @bank: bank responsible for this interrupt
  */
 struct exynos_weint_data {
-        struct irq_domain       *domain;
-        u32                     irq;
+        unsigned int irq;
+        struct samsung_pin_bank *bank;
+};
+
+/**
+ * struct exynos_muxed_weint_data: irq specific data for muxed wakeup interrupts
+ * generated by the external wakeup interrupt controller.
+ * @nr_banks: count of banks being part of the mux
+ * @banks: array of banks being part of the mux
+ */
+struct exynos_muxed_weint_data {
+        unsigned int nr_banks;
+        struct samsung_pin_bank *banks[];
 };