[PATCH v4 5/8] pinctrl: freescale: imx: add ZERO_OFFSET_VALID flag

[Adrian Alonso <aalonso@xxxxxxxxxxxxx>]

- Add ZERO_OFFSET_VALID flag, on imx7d mux_conf reg
  offset is zero for iomuxc-lspr controller
- Do default initialization on parse group function.

Signed-off-by: Adrian Alonso <aalonso@xxxxxxxxxxxxx>
---
Changes for V2: Resend
Changes for V3: Resend
Changes for V4: Simplify pin_id assigment when ZERO_OFFSET_VALID is set

 drivers/pinctrl/freescale/pinctrl-imx.c | 20 ++++++++++----------
 drivers/pinctrl/freescale/pinctrl-imx.h |  1 +
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
index b9c6deb..866d864 100644
--- a/drivers/pinctrl/freescale/pinctrl-imx.c
+++ b/drivers/pinctrl/freescale/pinctrl-imx.c
@@ -437,7 +437,7 @@ static void imx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
 	const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
 	unsigned long config;
 
-	if (!pin_reg || pin_reg->conf_reg == -1) {
+	if (pin_reg->conf_reg == -1) {
 		seq_printf(s, "N/A");
 		return;
 	}
@@ -536,21 +536,26 @@ static int imx_pinctrl_parse_groups(struct device_node *np,
 		return -ENOMEM;
 
 	for (i = 0; i < grp->npins; i++) {
-		u32 mux_reg = be32_to_cpu(*list++);
+		u32 mux_reg;
 		u32 conf_reg;
 		unsigned int pin_id;
 		struct imx_pin_reg *pin_reg;
 		struct imx_pin *pin = &grp->pins[i];
 
+		mux_reg = be32_to_cpu(*list++);
+		if (!(info->flags & ZERO_OFFSET_VALID) && !mux_reg)
+			mux_reg = -1;
+
 		if (info->flags & SHARE_MUX_CONF_REG) {
 			conf_reg = mux_reg;
 		} else {
 			conf_reg = be32_to_cpu(*list++);
-			if (!conf_reg)
+			if (!(info->flags & ZERO_OFFSET_VALID) && !conf_reg)
 				conf_reg = -1;
 		}
 
-		pin_id = mux_reg ? mux_reg / 4 : conf_reg / 4;
+		pin_id = (mux_reg != -1) ? mux_reg / 4 : conf_reg / 4;
+
 		pin_reg = &info->pin_regs[pin_id];
 		pin->pin = pin_id;
 		grp->pin_ids[i] = pin_id;
@@ -684,7 +689,7 @@ int imx_pinctrl_probe(struct platform_device *pdev,
 {
 	struct imx_pinctrl *ipctl;
 	struct resource *res;
-	int ret, i;
+	int ret;
 
 	if (!info || !info->pins || !info->npins) {
 		dev_err(&pdev->dev, "wrong pinctrl info\n");
@@ -702,11 +707,6 @@ int imx_pinctrl_probe(struct platform_device *pdev,
 	if (!info->pin_regs)
 		return -ENOMEM;
 
-	for (i = 0; i < info->npins; i++) {
-		info->pin_regs[i].mux_reg = -1;
-		info->pin_regs[i].conf_reg = -1;
-	}
-
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	ipctl->base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(ipctl->base))
diff --git a/drivers/pinctrl/freescale/pinctrl-imx.h b/drivers/pinctrl/freescale/pinctrl-imx.h
index 2a5fe72..2a592f6 100644
--- a/drivers/pinctrl/freescale/pinctrl-imx.h
+++ b/drivers/pinctrl/freescale/pinctrl-imx.h
@@ -85,6 +85,7 @@ struct imx_pinctrl_soc_info {
 };
 
 #define SHARE_MUX_CONF_REG	0x1
+#define ZERO_OFFSET_VALID	0x2
 
 #define NO_MUX		0x0
 #define NO_PAD		0x0
-- 
2.1.4

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