[PATCH 2/4] net: designware: eqos: reset phy

[Sascha Hauer]

The designware eqos DT binding has support for specifying reset GPIOs.
Add support for them. This binding is deprecated for new boards, but
there are still some upstream dts files using it.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 drivers/net/designware_eqos.c | 28 ++++++++++++++++++++++++++++
 drivers/of/of_gpio.c          |  7 +++++++
 2 files changed, 35 insertions(+)

diff --git a/drivers/net/designware_eqos.c b/drivers/net/designware_eqos.c
index d2baaeaf63..e6248d408e 100644
--- a/drivers/net/designware_eqos.c
+++ b/drivers/net/designware_eqos.c
@@ -8,9 +8,12 @@
 
 #include <common.h>
 #include <init.h>
+#include <gpio.h>
+#include <gpiod.h>
 #include <dma.h>
 #include <net.h>
 #include <of_net.h>
+#include <of_gpio.h>
 #include <linux/iopoll.h>
 #include <linux/time.h>
 #include <linux/sizes.h>
@@ -189,6 +192,27 @@ struct eqos_desc {
 
 #define MII_BUSY		(1 << 0)
 
+static int eqos_phy_reset(struct device_d *dev, struct eqos *eqos)
+{
+	int phy_reset;
+	u32 delays[3] = { 0, 0, 0 };
+
+	phy_reset = gpiod_get(dev, "snps,reset", GPIOF_OUT_INIT_ACTIVE);
+
+	if (!gpio_is_valid(phy_reset))
+		return 0;
+
+	of_property_read_u32_array(dev->device_node,
+				   "snps,reset-delays-us",
+				   delays, ARRAY_SIZE(delays));
+
+	udelay(delays[1]);
+	gpio_set_active(phy_reset, false);
+	udelay(delays[2]);
+
+	return 0;
+}
+
 static int eqos_mdio_wait_idle(struct eqos *eqos)
 {
 	u32 idle;
@@ -843,6 +867,10 @@ int eqos_probe(struct device_d *dev, const struct eqos_ops *ops, void *priv)
 	if (ret)
 		return ret;
 
+	ret = eqos_phy_reset(dev, eqos);
+	if (ret)
+		return ret;
+
 	ret = mdiobus_register(miibus);
 	if (ret)
 		return ret;
diff --git a/drivers/of/of_gpio.c b/drivers/of/of_gpio.c
index 7cbeeaf69e..e1cafdc848 100644
--- a/drivers/of/of_gpio.c
+++ b/drivers/of/of_gpio.c
@@ -35,6 +35,13 @@ static void of_gpio_flags_quirks(struct device_node *np,
 		if (active_low)
 			*flags |= OF_GPIO_ACTIVE_LOW;
 	}
+
+	/* Legacy handling of stmmac's active-low PHY reset line */
+	if (IS_ENABLED(CONFIG_DRIVER_NET_DESIGNWARE_EQOS) &&
+	    !strcmp(propname, "snps,reset-gpio") &&
+	    of_property_read_bool(np, "snps,reset-active-low"))
+		*flags |= OF_GPIO_ACTIVE_LOW;
+
 }
 
 /**
-- 
2.29.2