target/linux/generic/backport-5.10/796-v5.14-net-phy-realtek-add-dt-property-to-disable-CLKOUT-cl.patch

   1 From 0a4355c2b7f8ecd5e61cc262ecdbd4a2cce1ea7e Mon Sep 17 00:00:00 2001
   2 From: Joakim Zhang <qiangqing.zhang@nxp.com>
   3 Date: Tue, 8 Jun 2021 11:15:33 +0800
   4 Subject: [PATCH] net: phy: realtek: add dt property to disable CLKOUT clock
   5
   6 CLKOUT is enabled by default after PHY hardware reset, this patch adds
   7 "realtek,clkout-disable" property for user to disable CLKOUT clock
   8 to save PHY power.
   9
  10 Per RTL8211F guide, a PHY reset should be issued after setting these
  11 bits in PHYCR2 register. After this patch, CLKOUT clock output to be
  12 disabled.
  13
  14 Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
  15 Signed-off-by: David S. Miller <davem@davemloft.net>
  16 ---
  17  drivers/net/phy/realtek.c | 42 ++++++++++++++++++++++++++++++++++++++-
  18  1 file changed, 41 insertions(+), 1 deletion(-)
  19
  20 --- a/drivers/net/phy/realtek.c
  21 +++ b/drivers/net/phy/realtek.c
  22 @@ -8,6 +8,7 @@
  23   * Copyright (c) 2004 Freescale Semiconductor, Inc.
  24   */
  25  #include <linux/bitops.h>
  26 +#include <linux/of.h>
  27  #include <linux/phy.h>
  28  #include <linux/module.h>
  29  #include <linux/delay.h>
  30 @@ -27,6 +28,7 @@
  31  #define RTL821x_PAGE_SELECT                    0x1f
  32
  33  #define RTL8211F_PHYCR1                                0x18
  34 +#define RTL8211F_PHYCR2                                0x19
  35  #define RTL8211F_INSR                          0x1d
  36
  37  #define RTL8211F_TX_DELAY                      BIT(8)
  38 @@ -40,6 +42,8 @@
  39  #define RTL8211E_TX_DELAY                      BIT(12)
  40  #define RTL8211E_RX_DELAY                      BIT(11)
  41
  42 +#define RTL8211F_CLKOUT_EN                     BIT(0)
  43 +
  44  #define RTL8201F_ISR                           0x1e
  45  #define RTL8201F_IER                           0x13
  46
  47 @@ -62,6 +66,10 @@ MODULE_DESCRIPTION("Realtek PHY driver")
  48  MODULE_AUTHOR("Johnson Leung");
  49  MODULE_LICENSE("GPL");
  50
  51 +struct rtl821x_priv {
  52 +       u16 phycr2;
  53 +};
  54 +
  55  static int rtl821x_read_page(struct phy_device *phydev)
  56  {
  57         return __phy_read(phydev, RTL821x_PAGE_SELECT);
  58 @@ -72,6 +80,28 @@ static int rtl821x_write_page(struct phy
  59         return __phy_write(phydev, RTL821x_PAGE_SELECT, page);
  60  }
  61
  62 +static int rtl821x_probe(struct phy_device *phydev)
  63 +{
  64 +       struct device *dev = &phydev->mdio.dev;
  65 +       struct rtl821x_priv *priv;
  66 +
  67 +       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  68 +       if (!priv)
  69 +               return -ENOMEM;
  70 +
  71 +       priv->phycr2 = phy_read_paged(phydev, 0xa43, RTL8211F_PHYCR2);
  72 +       if (priv->phycr2 < 0)
  73 +               return priv->phycr2;
  74 +
  75 +       priv->phycr2 &= RTL8211F_CLKOUT_EN;
  76 +       if (of_property_read_bool(dev->of_node, "realtek,clkout-disable"))
  77 +               priv->phycr2 &= ~RTL8211F_CLKOUT_EN;
  78 +
  79 +       phydev->priv = priv;
  80 +
  81 +       return 0;
  82 +}
  83 +
  84  static int rtl8201_ack_interrupt(struct phy_device *phydev)
  85  {
  86         int err;
  87 @@ -180,6 +210,7 @@ static int rtl8211c_config_init(struct p
  88
  89  static int rtl8211f_config_init(struct phy_device *phydev)
  90  {
  91 +       struct rtl821x_priv *priv = phydev->priv;
  92         struct device *dev = &phydev->mdio.dev;
  93         u16 val_txdly, val_rxdly;
  94         u16 val;
  95 @@ -243,7 +274,15 @@ static int rtl8211f_config_init(struct p
  96                         val_rxdly ? "enabled" : "disabled");
  97         }
  98
  99 -       return 0;
 100 +       ret = phy_modify_paged(phydev, 0xa43, RTL8211F_PHYCR2,
 101 +                              RTL8211F_CLKOUT_EN, priv->phycr2);
 102 +       if (ret < 0) {
 103 +               dev_err(dev, "clkout configuration failed: %pe\n",
 104 +                       ERR_PTR(ret));
 105 +               return ret;
 106 +       }
 107 +
 108 +       return genphy_soft_reset(phydev);
 109  }
 110
 111  static int rtl821x_resume(struct phy_device *phydev)
 112 @@ -633,6 +672,7 @@ static struct phy_driver realtek_drvs[]
 113         }, {
 114                 PHY_ID_MATCH_EXACT(0x001cc916),
 115                 .name           = "RTL8211F Gigabit Ethernet",
 116 +               .probe          = rtl821x_probe,
 117                 .config_init    = &rtl8211f_config_init,
 118                 .ack_interrupt  = &rtl8211f_ack_interrupt,
 119                 .config_intr    = &rtl8211f_config_intr,