linux-kernel - [PATCH 12/26] net: stmmac: dwmac-qcom-ethqos: add support for the optional serdes phy

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Message-Id: <20230612092355.87937-13-brgl@bgdev.pl>
Date:   Mon, 12 Jun 2023 11:23:41 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Vinod Koul <vkoul@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>
Cc:     netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 12/26] net: stmmac: dwmac-qcom-ethqos: add support for the optional serdes phy

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

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@...aro.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 8ed05f29fe8b..3438b6229351 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;
@@ -566,6 +568,30 @@ 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_set_speed(ethqos->serdes_phy, ethqos->speed);
+	if (ret)
+		return ret;
+
+	ret = phy_init(ethqos->serdes_phy);
+	if (ret)
+		return ret;
+
+	return phy_power_on(ethqos->serdes_phy);
+}
+
+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;
@@ -651,6 +677,12 @@ 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);
@@ -666,6 +698,11 @@ 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