From 7994fe55a4a2009d9e9153ded4ac4369d1adaaa3 Mon Sep 17 00:00:00 2001
From: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Date: Thu, 15 Jan 2015 10:12:26 +0000
Subject: [PATCH] dm9000: Add regulator and reset support to dm9000

In boards, the dm9000 chip's power and reset can be controlled by gpio.

It makes sense to add them to the dm9000 driver and let dt be used to
enable power and reset the phy.

Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 .../bindings/net/davicom-dm9000.txt           |  4 ++
 drivers/net/ethernet/davicom/dm9000.c         | 40 +++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/davicom-dm9000.txt b/Documentation/devicetree/bindings/net/davicom-dm9000.txt
index 28767ed7c1bd..5224bf05f6f8 100644
--- a/Documentation/devicetree/bindings/net/davicom-dm9000.txt
+++ b/Documentation/devicetree/bindings/net/davicom-dm9000.txt
@@ -11,6 +11,8 @@ Required properties:
 Optional properties:
 - davicom,no-eeprom : Configuration EEPROM is not available
 - davicom,ext-phy : Use external PHY
+- reset-gpios : phandle of gpio that will be used to reset chip during probe
+- vcc-supply : phandle of regulator that will be used to enable power to chip
 
 Example:
 
@@ -21,4 +23,6 @@ Example:
 		interrupts = <7 4>;
 		local-mac-address = [00 00 de ad be ef];
 		davicom,no-eeprom;
+		reset-gpios = <&gpf 12 GPIO_ACTIVE_LOW>;
+		vcc-supply = <&eth0_power>;
 	};
diff --git a/drivers/net/ethernet/davicom/dm9000.c b/drivers/net/ethernet/davicom/dm9000.c
index ef0bb58750e6..c0a7813603c3 100644
--- a/drivers/net/ethernet/davicom/dm9000.c
+++ b/drivers/net/ethernet/davicom/dm9000.c
@@ -36,6 +36,9 @@
 #include <linux/platform_device.h>
 #include <linux/irq.h>
 #include <linux/slab.h>
+#include <linux/regulator/consumer.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
 
 #include <asm/delay.h>
 #include <asm/irq.h>
@@ -1426,11 +1429,48 @@ dm9000_probe(struct platform_device *pdev)
 	struct dm9000_plat_data *pdata = dev_get_platdata(&pdev->dev);
 	struct board_info *db;	/* Point a board information structure */
 	struct net_device *ndev;
+	struct device *dev = &pdev->dev;
 	const unsigned char *mac_src;
 	int ret = 0;
 	int iosize;
 	int i;
 	u32 id_val;
+	int reset_gpios;
+	enum of_gpio_flags flags;
+	struct regulator *power;
+
+	power = devm_regulator_get(dev, "vcc");
+	if (IS_ERR(power)) {
+		if (PTR_ERR(power) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+		dev_dbg(dev, "no regulator provided\n");
+	} else {
+		ret = regulator_enable(power);
+		if (ret != 0) {
+			dev_err(dev,
+				"Failed to enable power regulator: %d\n", ret);
+			return ret;
+		}
+		dev_dbg(dev, "regulator enabled\n");
+	}
+
+	reset_gpios = of_get_named_gpio_flags(dev->of_node, "reset-gpios", 0,
+					      &flags);
+	if (gpio_is_valid(reset_gpios)) {
+		ret = devm_gpio_request_one(dev, reset_gpios, flags,
+					    "dm9000_reset");
+		if (ret) {
+			dev_err(dev, "failed to request reset gpio %d: %d\n",
+				reset_gpios, ret);
+			return -ENODEV;
+		}
+
+		/* According to manual PWRST# Low Period Min 1ms */
+		msleep(2);
+		gpio_set_value(reset_gpios, 1);
+		/* Needs 3ms to read eeprom when PWRST is deasserted */
+		msleep(4);
+	}
 
 	if (!pdata) {
 		pdata = dm9000_parse_dt(&pdev->dev);
-- 
2.34.1