linux-kernel - [PATCH] pinctrl-msm: Support output-{high,low} configuration

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Message-Id: <1391572531-6610-1-git-send-email-bjorn.andersson@sonymobile.com>
Date:	Tue,  4 Feb 2014 19:55:31 -0800
From:	Bjorn Andersson <bjorn@...o.se>
To:	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH] pinctrl-msm: Support output-{high,low} configuration

Add support for configuring pins as output with value as from the
pinconf-generic interface.

Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
---
 drivers/pinctrl/pinctrl-msm.c |   27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-msm.c b/drivers/pinctrl/pinctrl-msm.c
index ef2bf31..2cfb1d4 100644
--- a/drivers/pinctrl/pinctrl-msm.c
+++ b/drivers/pinctrl/pinctrl-msm.c
@@ -228,6 +228,11 @@ static int msm_config_reg(struct msm_pinctrl *pctrl,
 		*bit = g->drv_bit;
 		*mask = 7;
 		break;
+	case PIN_CONFIG_OUTPUT:
+		*reg = g->ctl_reg;
+		*bit = g->oe_bit;
+		*mask = 1;
+		break;
 	default:
 		dev_err(pctrl->dev, "Invalid config param %04x\n", param);
 		return -ENOTSUPP;
@@ -301,6 +306,14 @@ static int msm_config_group_get(struct pinctrl_dev *pctldev,
 	case PIN_CONFIG_DRIVE_STRENGTH:
 		arg = msm_regval_to_drive[arg];
 		break;
+	case PIN_CONFIG_OUTPUT:
+		/* Pin is not output */
+		if (!arg)
+			return -EINVAL;
+
+		val = readl(pctrl->regs + g->io_reg);
+		arg = !!(val & BIT(g->in_bit));
+		break;
 	default:
 		dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
 			param);
@@ -357,6 +370,20 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev,
 			else
 				arg = msm_drive_to_regval[arg];
 			break;
+		case PIN_CONFIG_OUTPUT:
+			/* set output value */
+			spin_lock_irqsave(&pctrl->lock, flags);
+			val = readl(pctrl->regs + g->io_reg);
+			if (arg)
+				val |= BIT(g->out_bit);
+			else
+				val &= ~BIT(g->out_bit);
+			writel(val, pctrl->regs + g->io_reg);
+			spin_unlock_irqrestore(&pctrl->lock, flags);
+
+			/* enable output */
+			arg = 1;
+			break;
 		default:
 			dev_err(pctrl->dev, "Unsupported config parameter: %x\n",
 				param);
-- 
1.7.9.5

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