pinctrl: imx: add gpio pinmux support for vf610

Add pinmux support for GPIO for Vybrid (vf610) IOMUX controller.
This is needed since direction configuration is not part of the
GPIO module in Vybrid.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/freescale/pinctrl-imx.c

@@ -294,11 +294,83 @@ static int imx_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
 	return 0;
 }
 
+static int imx_pmx_gpio_request_enable(struct pinctrl_dev *pctldev,
+			struct pinctrl_gpio_range *range, unsigned offset)
+{
+	struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
+	const struct imx_pinctrl_soc_info *info = ipctl->info;
+	const struct imx_pin_reg *pin_reg;
+	struct imx_pin_group *grp;
+	struct imx_pin *imx_pin;
+	unsigned int pin, group;
+	u32 reg;
+
+	/* Currently implementation only for shared mux/conf register */
+	if (!(info->flags & SHARE_MUX_CONF_REG))
+		return -EINVAL;
+
+	pin_reg = &info->pin_regs[offset];
+	if (pin_reg->mux_reg == -1)
+		return -EINVAL;
+
+	/* Find the pinctrl config with GPIO mux mode for the requested pin */
+	for (group = 0; group < info->ngroups; group++) {
+		grp = &info->groups[group];
+		for (pin = 0; pin < grp->npins; pin++) {
+			imx_pin = &grp->pins[pin];
+			if (imx_pin->pin == offset && !imx_pin->mux_mode)
+				goto mux_pin;
+		}
+	}
+
+	return -EINVAL;
+
+mux_pin:
+	reg = readl(ipctl->base + pin_reg->mux_reg);
+	reg &= ~(0x7 << 20);
+	reg |= imx_pin->config;
+	writel(reg, ipctl->base + pin_reg->mux_reg);
+
+	return 0;
+}
+
+static int imx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
+	   struct pinctrl_gpio_range *range, unsigned offset, bool input)
+{
+	struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
+	const struct imx_pinctrl_soc_info *info = ipctl->info;
+	const struct imx_pin_reg *pin_reg;
+	u32 reg;
+
+	/*
+	 * Only Vybrid has the input/output buffer enable flags (IBE/OBE)
+	 * They are part of the shared mux/conf register.
+	 */
+	if (!(info->flags & SHARE_MUX_CONF_REG))
+		return -EINVAL;
+
+	pin_reg = &info->pin_regs[offset];
+	if (pin_reg->mux_reg == -1)
+		return -EINVAL;
+
+	/* IBE always enabled allows us to read the value "on the wire" */
+	reg = readl(ipctl->base + pin_reg->mux_reg);
+	if (input)
+		reg &= ~0x2;
+	else
+		reg |= 0x2;
+	writel(reg, ipctl->base + pin_reg->mux_reg);
+
+	return 0;
+}
+
 static const struct pinmux_ops imx_pmx_ops = {
 	.get_functions_count = imx_pmx_get_funcs_count,
 	.get_function_name = imx_pmx_get_func_name,
 	.get_function_groups = imx_pmx_get_groups,
 	.set_mux = imx_pmx_set,
+	.gpio_request_enable = imx_pmx_gpio_request_enable,
+	.gpio_set_direction = imx_pmx_gpio_set_direction,
 };
 
 static int imx_pinconf_get(struct pinctrl_dev *pctldev,