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net: phy: realtek: add dt property to disable CLKOUT clock 

CLKOUT is enabled by default after PHY hardware reset, this patch adds
"realtek,clkout-disable" property for user to disable CLKOUT clock
to save PHY power.

Per RTL8211F guide, a PHY reset should be issued after setting these
bits in PHYCR2 register. After this patch, CLKOUT clock output to be
disabled.

Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Joakim Zhang 2021-06-08 11:15:33 +08:00 committed by David S. Miller
parent a9f15dc2b9
commit 0a4355c2b7
1 changed files with 41 additions and 1 deletions
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42
drivers/net/phy/realtek.c
View File

@ -8,6 +8,7 @@
* Copyright (c) 2004 Freescale Semiconductor, Inc.
*/
#include <linux/bitops.h>
#include <linux/of.h>
#include <linux/phy.h>
#include <linux/module.h>
#include <linux/delay.h>
@ -27,6 +28,7 @@
#define RTL821x_PAGE_SELECT 0x1f
#define RTL8211F_PHYCR1 0x18
#define RTL8211F_PHYCR2 0x19
#define RTL8211F_INSR 0x1d
#define RTL8211F_TX_DELAY BIT(8)
@ -40,6 +42,8 @@
#define RTL8211E_TX_DELAY BIT(12)
#define RTL8211E_RX_DELAY BIT(11)
#define RTL8211F_CLKOUT_EN BIT(0)
#define RTL8201F_ISR 0x1e
#define RTL8201F_ISR_ANERR BIT(15)
#define RTL8201F_ISR_DUPLEX BIT(13)
@ -71,6 +75,10 @@ MODULE_DESCRIPTION("Realtek PHY driver");
MODULE_AUTHOR("Johnson Leung");
MODULE_LICENSE("GPL");
struct rtl821x_priv {
u16 phycr2;
};
static int rtl821x_read_page(struct phy_device *phydev)
{
return __phy_read(phydev, RTL821x_PAGE_SELECT);
@ -81,6 +89,28 @@ static int rtl821x_write_page(struct phy_device *phydev, int page)
return __phy_write(phydev, RTL821x_PAGE_SELECT, page);
}
static int rtl821x_probe(struct phy_device *phydev)
{
struct device *dev = &phydev->mdio.dev;
struct rtl821x_priv *priv;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->phycr2 = phy_read_paged(phydev, 0xa43, RTL8211F_PHYCR2);
if (priv->phycr2 < 0)
return priv->phycr2;
priv->phycr2 &= RTL8211F_CLKOUT_EN;
if (of_property_read_bool(dev->of_node, "realtek,clkout-disable"))
priv->phycr2 &= ~RTL8211F_CLKOUT_EN;
phydev->priv = priv;
return 0;
}
static int rtl8201_ack_interrupt(struct phy_device *phydev)
{
int err;
@ -291,6 +321,7 @@ static int rtl8211c_config_init(struct phy_device *phydev)
static int rtl8211f_config_init(struct phy_device *phydev)
{
struct rtl821x_priv *priv = phydev->priv;
struct device *dev = &phydev->mdio.dev;
u16 val_txdly, val_rxdly;
u16 val;
@ -354,7 +385,15 @@ static int rtl8211f_config_init(struct phy_device *phydev)
val_rxdly ? "enabled" : "disabled");
}
return 0;
ret = phy_modify_paged(phydev, 0xa43, RTL8211F_PHYCR2,
RTL8211F_CLKOUT_EN, priv->phycr2);
if (ret < 0) {
dev_err(dev, "clkout configuration failed: %pe\n",
ERR_PTR(ret));
return ret;
}
return genphy_soft_reset(phydev);
}
static int rtl8211e_config_init(struct phy_device *phydev)
@ -847,6 +886,7 @@ static struct phy_driver realtek_drvs[] = {
}, {
PHY_ID_MATCH_EXACT(0x001cc916),
.name = "RTL8211F Gigabit Ethernet",
.probe = rtl821x_probe,
.config_init = &rtl8211f_config_init,
.read_status = rtlgen_read_status,
.config_intr = &rtl8211f_config_intr,