pinctrl: rockchip: do not require 2nd register area

Deprecate secondary register area for rk3188 pulls. Instead use big enough
initial mapping of grf registers to catch all.

The now deprecated register is still supported though.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Max Schwarz <max.schwarz@online.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/rockchip,pinctrl.txt

@@ -22,6 +22,8 @@ Required properties for iomux controller:
   - compatible: one of "rockchip,rk2928-pinctrl", "rockchip,rk3066a-pinctrl"
 		       "rockchip,rk3066b-pinctrl", "rockchip,rk3188-pinctrl"
   - reg: first element is the general register space of the iomux controller
+	 It should be large enough to contain also separate pull registers.
+	 Deprecated:
 	 second element is the separate pull register space of the rk3188
 
 Required properties for gpio sub nodes:

drivers/pinctrl/pinctrl-rockchip.c

@@ -160,6 +160,7 @@ struct rockchip_pmx_func {
 
 struct rockchip_pinctrl {
 	void __iomem			*reg_base;
+	int				reg_size;
 	void __iomem			*reg_pull;
 	struct device			*dev;
 	struct rockchip_pin_ctrl	*ctrl;
@@ -416,6 +417,7 @@ static void rk2928_calc_pull_reg_and_bit(struct rockchip_pin_bank *bank,
 	*bit = pin_num % RK2928_PULL_PINS_PER_REG;
 };
 
+#define RK3188_PULL_OFFSET		0x164
 #define RK3188_PULL_BITS_PER_PIN	2
 #define RK3188_PULL_PINS_PER_REG	8
 #define RK3188_PULL_BANK_STRIDE		16
@@ -432,7 +434,10 @@ static void rk3188_calc_pull_reg_and_bit(struct rockchip_pin_bank *bank,
 		*bit = pin_num % RK3188_PULL_PINS_PER_REG;
 		*bit *= RK3188_PULL_BITS_PER_PIN;
 	} else {
-		*reg = info->reg_pull - 4;
+		*reg = info->reg_pull ? info->reg_pull
+				      : info->reg_base + RK3188_PULL_OFFSET;
+		/* correct the offset, as it is the 2nd pull register */
+		*reg -= 4;
 		*reg += bank->bank_num * RK3188_PULL_BANK_STRIDE;
 		*reg += ((pin_num / RK3188_PULL_PINS_PER_REG) * 4);
 
@@ -1427,6 +1432,7 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank,
 	 */
 	if (of_device_is_compatible(bank->of_node,
 				    "rockchip,rk3188-gpio-bank0")) {
+
 		bank->bank_type = RK3188_BANK0;
 
 		if (of_address_to_resource(bank->of_node, 1, &res)) {
@@ -1525,8 +1531,11 @@ static int rockchip_pinctrl_probe(struct platform_device *pdev)
 	if (IS_ERR(info->reg_base))
 		return PTR_ERR(info->reg_base);
 
-	/* The RK3188 has its pull registers in a separate place */
-	if (ctrl->type == RK3188) {
+	/* to check for the old dt-bindings */
+	info->reg_size = resource_size(res);
+
+	/* Honor the old binding, with pull registers as 2nd resource */
+	if (ctrl->type == RK3188 &&  info->reg_size < 0x200) {
 		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 		info->reg_pull = devm_ioremap_resource(&pdev->dev, res);
 		if (IS_ERR(info->reg_pull))