pinctrl: add clock code

This will not be needed once power domain support is added.
Signed-off-by: Joey Gouly <joey.gouly@arm.com>

drivers/pinctrl/pinctrl-apple-gpio.c

@@ -449,6 +449,7 @@ static int apple_gpio_gpio_register(struct apple_gpio_pinctrl *pctl)
 static int apple_gpio_pinctrl_probe(struct platform_device *pdev)
 {
 	struct apple_gpio_pinctrl *pctl;
+	struct clk *clk;
 	struct pinctrl_pin_desc *pins;
 	unsigned int npins;
 	const char **pin_names;
@@ -489,6 +490,17 @@ static int apple_gpio_pinctrl_probe(struct platform_device *pdev)
 	if (IS_ERR(pctl->base))
 		return PTR_ERR(pctl->base);
 
+	clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(clk)) {
+		dev_err(&pdev->dev, "unable to get clock: %ld.\n",
+			PTR_ERR(clk));
+		return PTR_ERR(clk);
+	}
+
+	res = clk_prepare_enable(clk);
+	if (res)
+		return res;
+
 	for (i = 0; i < npins; i++) {
 		reg = apple_gpio_get_reg(pctl, i);
 		pctl->pin_shadow[i] = reg;