netdev - [PATCH v4 7/8] net: stmmac: qcom-ethqos: define a callback for setting the serdes speed

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Message-Id: <20251104-qcom-sa8255p-emac-v4-7-f76660087cea@linaro.org>
Date: Tue, 04 Nov 2025 14:08:58 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Richard Cochran <richardcochran@...il.com>, 
 Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Vinod Koul <vkoul@...nel.org>, Giuseppe Cavallaro <peppe.cavallaro@...com>, 
 Jose Abreu <joabreu@...opsys.com>, Chen-Yu Tsai <wens@...nel.org>, 
 Jernej Skrabec <jernej.skrabec@...il.com>, 
 Samuel Holland <samuel@...lland.org>, 
 Matthew Gerlach <matthew.gerlach@...era.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>, 
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>, 
 Keguang Zhang <keguang.zhang@...il.com>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Jan Petrous <jan.petrous@....nxp.com>, 
 s32@....com, Romain Gantois <romain.gantois@...tlin.com>, 
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 Heiko Stuebner <heiko@...ech.de>, Chen Wang <unicorn_wang@...look.com>, 
 Inochi Amaoto <inochiama@...il.com>, Emil Renner Berthing <kernel@...il.dk>, 
 Minda Chen <minda.chen@...rfivetech.com>, Drew Fustini <fustini@...nel.org>, 
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 Geert Uytterhoeven <geert+renesas@...der.be>, 
 Magnus Damm <magnus.damm@...il.com>, Maxime Ripard <mripard@...nel.org>, 
 Shuang Liang <liangshuang@...incomputing.com>, 
 Zhi Li <lizhi2@...incomputing.com>, 
 Shangjuan Wei <weishangjuan@...incomputing.com>, 
 "G. Jaya Kumaran" <vineetha.g.jaya.kumaran@...el.com>, 
 Clark Wang <xiaoning.wang@....com>, Linux Team <linux-imx@....com>, 
 Frank Li <Frank.Li@....com>, David Wu <david.wu@...k-chips.com>, 
 Samin Guo <samin.guo@...rfivetech.com>, 
 Christophe Roullier <christophe.roullier@...s.st.com>, 
 Swathi K S <swathi.ks@...sung.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
 linux-stm32@...md-mailman.stormreply.com, 
 linux-arm-kernel@...ts.infradead.org, 
 Drew Fustini <dfustini@...storrent.com>, linux-sunxi@...ts.linux.dev, 
 linux-amlogic@...ts.infradead.org, linux-mips@...r.kernel.org, 
 imx@...ts.linux.dev, linux-renesas-soc@...r.kernel.org, 
 linux-rockchip@...ts.infradead.org, sophgo@...ts.linux.dev, 
 linux-riscv@...ts.infradead.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v4 7/8] net: stmmac: qcom-ethqos: define a callback for
 setting the serdes speed

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

Ahead of adding support for firmware driven power management, let's
allow different ways of setting the PHY speed. To that end create a
callback with a single implementation for now, that will be extended
later.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index 09f122062dec87aa11804af2769ddff4964e6596..446f06b591a0b70992c7a431b56cf88c1b6718fd 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -120,6 +120,7 @@ struct qcom_ethqos {
 	struct ethqos_emac_pm_ctx pm;
 	phy_interface_t phy_mode;
 	int serdes_speed;
+	int (*set_serdes_speed)(struct qcom_ethqos *ethqos);

 	const struct ethqos_emac_por *por;
 	unsigned int num_por;
@@ -640,11 +641,16 @@ static int ethqos_configure_rgmii(struct qcom_ethqos *ethqos, int speed)
 	return 0;
 }

+static int ethqos_set_serdes_speed_phy(struct qcom_ethqos *ethqos)
+{
+	return phy_set_speed(ethqos->pm.serdes_phy, ethqos->serdes_speed);
+}
+
 static void ethqos_set_serdes_speed(struct qcom_ethqos *ethqos, int speed)
 {
 	if (ethqos->serdes_speed != speed) {
-		phy_set_speed(ethqos->pm.serdes_phy, speed);
 		ethqos->serdes_speed = speed;
+		ethqos->set_serdes_speed(ethqos);
 	}
 }

@@ -865,6 +871,7 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, PTR_ERR(ethqos->pm.serdes_phy),
 				     "Failed to get serdes phy\n");

+	ethqos->set_serdes_speed = ethqos_set_serdes_speed_phy;
 	ethqos->serdes_speed = SPEED_1000;
 	ethqos_update_link_clk(ethqos, SPEED_1000);
 	ethqos_set_func_clk_en(ethqos);

-- 
2.51.0