linux-kernel - [PATCH v3 7/7] net: phy: realtek: configure RTL8211E LEDs

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Date:   Mon,  8 Jul 2019 12:24:59 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     "David S . Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH v3 7/7] net: phy: realtek: configure RTL8211E LEDs

Configure the RTL8211E LEDs behavior when the device tree property
'realtek,led-modes' is specified.

Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---
TODO: DT validation

Changes in v3:
- sanity check led-modes values
- set LACR bits in a more readable way
- use phydev_err() instead of dev_err()
- log an error if LED configuration fails

Changes in v2:
- patch added to the series
---
 drivers/net/phy/realtek.c | 72 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 70 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index 5854412403b5..e9fb67654c4e 100644
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -9,10 +9,12 @@
  * Copyright (c) 2004 Freescale Semiconductor, Inc.
  */
 #include <linux/bitops.h>
+#include <linux/bits.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/phy.h>
+#include <dt-bindings/net/realtek.h>
 
 #define RTL821x_PHYSR				0x11
 #define RTL821x_PHYSR_DUPLEX			BIT(13)
@@ -34,6 +36,15 @@
 #define RTL8211E_EEE_LED_MODE1			0x05
 #define RTL8211E_EEE_LED_MODE2			0x06
 
+/* RTL8211E extension page 44 */
+#define RTL8211E_LACR				0x1a
+#define RLT8211E_LACR_LEDACTCTRL_SHIFT		4
+#define RLT8211E_LACR_LEDACTCTRL_MASK		GENMASK(6, 4)
+#define RTL8211E_LCR				0x1c
+#define RTL8211E_LCR_LEDCTRL_MASK		(GENMASK(2, 0) | \
+						 GENMASK(6, 4) | \
+						 GENMASK(10, 8))
+
 /* RTL8211E extension page 160 */
 #define RTL8211E_SCR				0x1a
 #define RTL8211E_SCR_DISABLE_RXC_SSC		BIT(2)
@@ -123,6 +134,62 @@ static void rtl8211e_disable_eee_led_mode(struct phy_device *phydev)
 	phy_restore_page(phydev, oldpage, err);
 }
 
+static int rtl8211e_config_leds(struct phy_device *phydev)
+{
+	struct device *dev = &phydev->mdio.dev;
+	int count, i, oldpage, ret;
+	u16 lacr_bits = 0, lcr_bits = 0;
+
+	if (!dev->of_node)
+		return 0;
+
+	if (of_property_read_bool(dev->of_node, "realtek,eee-led-mode-disable"))
+		rtl8211e_disable_eee_led_mode(phydev);
+
+	count = of_property_count_elems_of_size(dev->of_node,
+						"realtek,led-modes",
+						sizeof(u32));
+	if (count < 0 || count > 3)
+		return -EINVAL;
+
+	for (i = 0; i < count; i++) {
+		u32 val;
+
+		of_property_read_u32_index(dev->of_node,
+					   "realtek,led-modes", i, &val);
+		if ((val > RTL8211E_LINK_10_100_1000 &&
+		    val < RTL8211E_LINK_ACTIVITY) ||
+		    val > (RTL8211E_LINK_ACTIVITY | RTL8211E_LINK_10_100_1000))
+			return -EINVAL;
+
+		if (val & RTL8211E_LINK_ACTIVITY)
+			lacr_bits |= BIT(RLT8211E_LACR_LEDACTCTRL_SHIFT + i);
+
+		lcr_bits |= (u16)(val & 0xf) << (i * 4);
+	}
+
+	oldpage = rtl8211e_select_ext_page(phydev, 44);
+	if (oldpage < 0) {
+		phydev_err(phydev, "failed to select extended page: %d\n", oldpage);
+		goto err;
+	}
+
+	ret = __phy_modify(phydev, RTL8211E_LACR,
+			   RLT8211E_LACR_LEDACTCTRL_MASK, lacr_bits);
+	if (ret) {
+		phydev_err(phydev, "failed to write LACR reg: %d\n", ret);
+		goto err;
+	}
+
+	ret = __phy_modify(phydev, RTL8211E_LCR,
+			   RTL8211E_LCR_LEDCTRL_MASK, lcr_bits);
+	if (ret)
+		phydev_err(phydev, "failed to write LCR reg: %d\n", ret);
+
+err:
+	return phy_restore_page(phydev, oldpage, ret);
+}
+
 static int rtl8201_ack_interrupt(struct phy_device *phydev)
 {
 	int err;
@@ -267,8 +334,9 @@ static int rtl8211e_config_init(struct phy_device *phydev)
 				   ret);
 	}
 
-	if (of_property_read_bool(dev->of_node, "realtek,eee-led-mode-disable"))
-		rtl8211e_disable_eee_led_mode(phydev);
+	ret = rtl8211e_config_leds(phydev);
+	if (ret)
+		phydev_err(phydev, "LED configuration failed: %d\n", ret);
 
 	/* enable TX/RX delay for rgmii-* modes, and disable them for rgmii. */
 	switch (phydev->interface) {
-- 
2.22.0.410.gd8fdbe21b5-goog