netdev - [PATCH 2/4] lan78xx: Read initial EEE setting from Device Tree

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Message-Id: <1523541336-145953-3-git-send-email-phil@raspberrypi.org>
Date:   Thu, 12 Apr 2018 14:55:34 +0100
From:   Phil Elwell <phil@...pberrypi.org>
To:     Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Cc:     Phil Elwell <phil@...pberrypi.org>
Subject: [PATCH 2/4] lan78xx: Read initial EEE setting from Device Tree

Add two new Device Tree properties:
* microchip,eee-enabled  - a boolean to enable EEE
* microchip,tx-lpi-timer - time in microseconds to wait after TX goes
                           idle before entering the low power state
                           (default 600)

Signed-off-by: Phil Elwell <phil@...pberrypi.org>
---
 drivers/net/usb/lan78xx.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index d2727b5..d98397b 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -2080,6 +2080,23 @@ static int lan78xx_phy_init(struct lan78xx_net *dev)
 	mii_adv = (u32)mii_advertise_flowctrl(dev->fc_request_control);
 	phydev->advertising |= mii_adv_to_ethtool_adv_t(mii_adv);
 
+	if (of_property_read_bool(dev->udev->dev.of_node,
+				  "microchip,eee-enabled")) {
+		struct ethtool_eee edata;
+
+		memset(&edata, 0, sizeof(edata));
+		edata.cmd = ETHTOOL_SEEE;
+		edata.advertised = ADVERTISED_1000baseT_Full |
+				   ADVERTISED_100baseT_Full;
+		edata.eee_enabled = true;
+		edata.tx_lpi_enabled = true;
+		if (of_property_read_u32(dev->udev->dev.of_node,
+					 "microchip,tx-lpi-timer",
+					 &edata.tx_lpi_timer))
+			edata.tx_lpi_timer = 600; /* non-aggressive */
+		(void)lan78xx_set_eee(dev->net, &edata);
+	}
+
 	genphy_config_aneg(phydev);
 
 	dev->fc_autoneg = phydev->autoneg;
-- 
2.7.4