pinctrl: msm: add support to configure ipq40xx GPIO_PULL bits

GPIO_PULL bits configurations in TLMM_GPIO_CFG register
differs for IPQ40xx from rest of the other qcom SoCs.
As it does not support the keeper state and therefore can't
support bias-bus-hold property.

This patch adds a pull_no_keeper setting which configures the
msm_gpio_pull bits for ipq40xx. This is required to fix the
proper configurations of gpio-pull bits for nand pins mux.

IPQ40xx SoC:
2'b10: Internal pull up enable.
2'b11: Unsupport

For other SoC's:
2'b10: Keeper
2'b11: Pull-Up

Note: Due to pull_no_keeper length, all kerneldoc entries
in the msm_pinctrl_soc_data struct had to be realigned.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Ram Chandra Jangir <rjangir@codeaurora.org>
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/qcom/pinctrl-ipq4019.c

@@ -706,6 +706,7 @@ static const struct msm_pinctrl_soc_data ipq4019_pinctrl = {
 	.groups = ipq4019_groups,
 	.ngroups = ARRAY_SIZE(ipq4019_groups),
 	.ngpios = 100,
+	.pull_no_keeper = true,
 };
 
 static int ipq4019_pinctrl_probe(struct platform_device *pdev)

drivers/pinctrl/qcom/pinctrl-msm.c

@@ -202,10 +202,11 @@ static int msm_config_reg(struct msm_pinctrl *pctrl,
 	return 0;
 }
 
-#define MSM_NO_PULL	0
-#define MSM_PULL_DOWN	1
-#define MSM_KEEPER	2
-#define MSM_PULL_UP	3
+#define MSM_NO_PULL		0
+#define MSM_PULL_DOWN		1
+#define MSM_KEEPER		2
+#define MSM_PULL_UP_NO_KEEPER	2
+#define MSM_PULL_UP		3
 
 static unsigned msm_regval_to_drive(u32 val)
 {
@@ -243,10 +244,16 @@ static int msm_config_group_get(struct pinctrl_dev *pctldev,
 		arg = arg == MSM_PULL_DOWN;
 		break;
 	case PIN_CONFIG_BIAS_BUS_HOLD:
+		if (pctrl->soc->pull_no_keeper)
+			return -ENOTSUPP;
+
 		arg = arg == MSM_KEEPER;
 		break;
 	case PIN_CONFIG_BIAS_PULL_UP:
-		arg = arg == MSM_PULL_UP;
+		if (pctrl->soc->pull_no_keeper)
+			arg = arg == MSM_PULL_UP_NO_KEEPER;
+		else
+			arg = arg == MSM_PULL_UP;
 		break;
 	case PIN_CONFIG_DRIVE_STRENGTH:
 		arg = msm_regval_to_drive(arg);
@@ -309,10 +316,16 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev,
 			arg = MSM_PULL_DOWN;
 			break;
 		case PIN_CONFIG_BIAS_BUS_HOLD:
+			if (pctrl->soc->pull_no_keeper)
+				return -ENOTSUPP;
+
 			arg = MSM_KEEPER;
 			break;
 		case PIN_CONFIG_BIAS_PULL_UP:
-			arg = MSM_PULL_UP;
+			if (pctrl->soc->pull_no_keeper)
+				arg = MSM_PULL_UP_NO_KEEPER;
+			else
+				arg = MSM_PULL_UP;
 			break;
 		case PIN_CONFIG_DRIVE_STRENGTH:
 			/* Check for invalid values */

drivers/pinctrl/qcom/pinctrl-msm.h

@@ -99,13 +99,14 @@ struct msm_pingroup {
 
 /**
  * struct msm_pinctrl_soc_data - Qualcomm pin controller driver configuration
- * @pins:       An array describing all pins the pin controller affects.
- * @npins:      The number of entries in @pins.
- * @functions:  An array describing all mux functions the SoC supports.
- * @nfunctions: The number of entries in @functions.
- * @groups:     An array describing all pin groups the pin SoC supports.
- * @ngroups:    The numbmer of entries in @groups.
- * @ngpio:      The number of pingroups the driver should expose as GPIOs.
+ * @pins:	    An array describing all pins the pin controller affects.
+ * @npins:	    The number of entries in @pins.
+ * @functions:	    An array describing all mux functions the SoC supports.
+ * @nfunctions:	    The number of entries in @functions.
+ * @groups:	    An array describing all pin groups the pin SoC supports.
+ * @ngroups:	    The numbmer of entries in @groups.
+ * @ngpio:	    The number of pingroups the driver should expose as GPIOs.
+ * @pull_no_keeper: The SoC does not support keeper bias.
  */
 struct msm_pinctrl_soc_data {
 	const struct pinctrl_pin_desc *pins;
@@ -115,6 +116,7 @@ struct msm_pinctrl_soc_data {
 	const struct msm_pingroup *groups;
 	unsigned ngroups;
 	unsigned ngpios;
+	bool pull_no_keeper;
 };
 
 int msm_pinctrl_probe(struct platform_device *pdev,