pinctrl: Add pinctrl-s3c24xx driver

The s3c24xx pins follow a similar pattern as the other Samsung SoCs and
can therefore reuse the already introduced infrastructure.

The s3c24xx SoCs have one design oddity in that the first 4 external
interrupts do not reside in the eint pending register but in the main
interrupt controller instead. We solve this by forwarding the external
interrupt from the main controller into the irq domain of the pin bank.
The masking/acking of these interrupts is handled in the same way.

Furthermore the S3C2412/2413 SoCs contain another oddity in that they
keep the same 4 eints in the main interrupt controller and eintpend
register and requiring ack operations to happen in both. This is solved
by using different compatible properties for the wakeup eint node which
set a property accordingly.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt

@@ -7,6 +7,10 @@ on-chip controllers onto these pads.
 
 Required Properties:
 - compatible: should be one of the following.
+  - "samsung,s3c2412-pinctrl": for S3C2412-compatible pin-controller,
+  - "samsung,s3c2416-pinctrl": for S3C2416-compatible pin-controller,
+  - "samsung,s3c2440-pinctrl": for S3C2440-compatible pin-controller,
+  - "samsung,s3c2450-pinctrl": for S3C2450-compatible pin-controller,
   - "samsung,s3c64xx-pinctrl": for S3C64xx-compatible pin-controller,
   - "samsung,exynos4210-pinctrl": for Exynos4210 compatible pin-controller.
   - "samsung,exynos4x12-pinctrl": for Exynos4x12 compatible pin-controller.
@@ -106,6 +110,10 @@ B. External Wakeup Interrupts: For supporting external wakeup interrupts, a
 
    - compatible: identifies the type of the external wakeup interrupt controller
      The possible values are:
+     - samsung,s3c2410-wakeup-eint: represents wakeup interrupt controller
+       found on Samsung S3C24xx SoCs except S3C2412 and S3C2413,
+     - samsung,s3c2412-wakeup-eint: represents wakeup interrupt controller
+       found on Samsung S3C2412 and S3C2413 SoCs,
      - samsung,s3c64xx-wakeup-eint: represents wakeup interrupt controller
        found on Samsung S3C64xx SoCs,
      - samsung,exynos4210-wakeup-eint: represents wakeup interrupt controller

drivers/gpio/gpio-samsung.c

@@ -3026,6 +3026,10 @@ static __init int samsung_gpiolib_init(void)
 	*/
 	struct device_node *pctrl_np;
 	static const struct of_device_id exynos_pinctrl_ids[] = {
+		{ .compatible = "samsung,s3c2412-pinctrl", },
+		{ .compatible = "samsung,s3c2416-pinctrl", },
+		{ .compatible = "samsung,s3c2440-pinctrl", },
+		{ .compatible = "samsung,s3c2450-pinctrl", },
 		{ .compatible = "samsung,exynos4210-pinctrl", },
 		{ .compatible = "samsung,exynos4x12-pinctrl", },
 		{ .compatible = "samsung,exynos5250-pinctrl", },

drivers/pinctrl/Kconfig

@@ -216,6 +216,11 @@ config PINCTRL_EXYNOS5440
 	select PINMUX
 	select PINCONF
 
+config PINCTRL_S3C24XX
+	bool "Samsung S3C24XX SoC pinctrl driver"
+	depends on ARCH_S3C24XX
+	select PINCTRL_SAMSUNG
+
 config PINCTRL_S3C64XX
 	bool "Samsung S3C64XX SoC pinctrl driver"
 	depends on ARCH_S3C64XX

drivers/pinctrl/Makefile

@@ -42,6 +42,7 @@ obj-$(CONFIG_PINCTRL_COH901)	+= pinctrl-coh901.o
 obj-$(CONFIG_PINCTRL_SAMSUNG)	+= pinctrl-samsung.o
 obj-$(CONFIG_PINCTRL_EXYNOS)	+= pinctrl-exynos.o
 obj-$(CONFIG_PINCTRL_EXYNOS5440)	+= pinctrl-exynos5440.o
+obj-$(CONFIG_PINCTRL_S3C24XX)	+= pinctrl-s3c24xx.o
 obj-$(CONFIG_PINCTRL_S3C64XX)	+= pinctrl-s3c64xx.o
 obj-$(CONFIG_PINCTRL_XWAY)	+= pinctrl-xway.o
 obj-$(CONFIG_PINCTRL_LANTIQ)	+= pinctrl-lantiq.o