linux-kernel - [PATCH RFC v2 4/8] pinctrl: zynq: Support IO standard property

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Date:	Thu, 16 Oct 2014 10:11:31 -0700
From:	Soren Brinkmann <soren.brinkmann@...inx.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Sören Brinkmann <soren.brinkmann@...inx.com>,
	Michal Simek <michal.simek@...inx.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>
Subject: [PATCH RFC v2 4/8] pinctrl: zynq: Support IO standard property

Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
---
 drivers/pinctrl/pinctrl-zynq.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-zynq.c b/drivers/pinctrl/pinctrl-zynq.c
index a32fac61cba0..f3fce76c8390 100644
--- a/drivers/pinctrl/pinctrl-zynq.c
+++ b/drivers/pinctrl/pinctrl-zynq.c
@@ -883,6 +883,18 @@ static const struct pinmux_ops zynq_pinmux_ops = {
 #define ZYNQ_PINCONF_SPEED	BIT(8)
 #define ZYNQ_PINCONF_PULLUP	BIT(12)
 
+#define ZYNQ_PINCONF_IOTYPE_SHIFT	9
+#define ZYNQ_PINCONF_IOTYPE_MASK	(7 << ZYNQ_PINCONF_IOTYPE_SHIFT)
+
+enum zynq_io_standards {
+	zynq_iostd_min,
+	zynq_iostd_lvcmos18,
+	zynq_iostd_lvcmos25,
+	zynq_iostd_lvcmos33,
+	zynq_iostd_hstl,
+	zynq_iostd_max
+};
+
 static int zynq_pinconf_cfg_get(struct pinctrl_dev *pctldev,
 				unsigned pin,
 				unsigned long *config)
@@ -918,6 +930,10 @@ static int zynq_pinconf_cfg_get(struct pinctrl_dev *pctldev,
 	case PIN_CONFIG_SLEW_RATE:
 		arg = !!(reg & ZYNQ_PINCONF_SPEED);
 		break;
+	case PIN_CONFIG_IOSTANDARD:
+		arg = reg & ZYNQ_PINCONF_IOTYPE_MASK;
+		arg >>= ZYNQ_PINCONF_IOTYPE_SHIFT;
+		break;
 	default:
 		return -ENOTSUPP;
 	}
@@ -969,6 +985,15 @@ static int zynq_pinconf_cfg_set(struct pinctrl_dev *pctldev,
 				reg &= ~ZYNQ_PINCONF_SPEED;
 
 			break;
+		case PIN_CONFIG_IOSTANDARD:
+			if (arg <= zynq_iostd_min || arg >= zynq_iostd_max) {
+				dev_warn(pctldev->dev,
+					 "unsupported IO standard '%u'\n",
+					 param);
+				break;
+			}
+			reg |= arg << ZYNQ_PINCONF_IOTYPE_SHIFT;
+			break;
 		default:
 			dev_warn(pctldev->dev,
 				 "unsupported configuration parameter '%u'\n",
-- 
2.1.2.1.g5e69ed6

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