[RESEND PATCH v2 08/14] net: stmmac: dwmac-qcom-ethqos: add support for the optional serdes phy

Bartosz Golaszewski
2023-06-19T09:25:21Z

On sa8775p platforms, there's a SGMII SerDes PHY between the MAC and
external PHY that we need to enable and configure.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
.../stmicro/stmmac/dwmac-qcom-ethqos.c | 37 +++++++++++++++++++
1 file changed, 37 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index ec3bbd199501..042733b5e80b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -6,6 +6,7 @@
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/phy.h>
+#include <linux/phy/phy.h>
#include <linux/property.h>

#include "stmmac.h"
@@ -93,6 +94,7 @@ struct qcom_ethqos {

unsigned int rgmii_clk_rate;
struct clk *rgmii_clk;
+ struct phy *serdes_phy;
unsigned int speed;

const struct ethqos_emac_por *por;
@@ -565,6 +567,30 @@ static void ethqos_fix_mac_speed(void *priv, unsigned int speed)
ethqos_configure(ethqos);
}

+static int qcom_ethqos_serdes_powerup(struct net_device *ndev, void *priv)
+{
+ struct qcom_ethqos *ethqos = priv;
+ int ret;
+
+ ret = phy_init(ethqos->serdes_phy);
+ if (ret)
+ return ret;
+
+ ret = phy_power_on(ethqos->serdes_phy);
+ if (ret)
+ return ret;
+
+ return phy_set_speed(ethqos->serdes_phy, ethqos->speed);
+}
+
+static void qcom_ethqos_serdes_powerdown(struct net_device *ndev, void *priv)
+{
+ struct qcom_ethqos *ethqos = priv;
+
+ phy_power_off(ethqos->serdes_phy);
+ phy_exit(ethqos->serdes_phy);
+}
+
static int ethqos_clks_config(void *priv, bool enabled)
{
struct qcom_ethqos *ethqos = priv;
@@ -650,6 +676,12 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
if (ret)
goto out_config_dt;

+ ethqos->serdes_phy = devm_phy_optional_get(dev, "serdes");
+ if (IS_ERR(ethqos->serdes_phy)) {
+ ret = PTR_ERR(ethqos->serdes_phy);
+ goto out_config_dt;
+ }
+
ethqos->speed = SPEED_1000;
ethqos_update_rgmii_clk(ethqos, SPEED_1000);
ethqos_set_func_clk_en(ethqos);
@@ -665,6 +697,11 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
if (of_device_is_compatible(np, "qcom,qcs404-ethqos"))
plat_dat->rx_clk_runs_in_lpi = 1;

+ if (ethqos->serdes_phy) {
+ plat_dat->serdes_powerup = qcom_ethqos_serdes_powerup;
+ plat_dat->serdes_powerdown = qcom_ethqos_serdes_powerdown;
+ }
+
ret = stmmac_dvr_probe(dev, plat_dat, &stmmac_res);
if (ret)
goto out_config_dt;
--
2.39.2