netdev - [PATCH net-next] net: stmmac: qcom-ethqos: use rgmii

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Message-Id: <E1tlRMK-004Vsx-Ss@rmk-PC.armlinux.org.uk>
Date: Fri, 21 Feb 2025 11:38:20 +0000
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>,
	Vinod Koul <vkoul@...nel.org>
Subject: [PATCH net-next] net: stmmac: qcom-ethqos: use rgmii_clock() to set
 the link clock

The link clock operates at twice the RGMII clock rate. Therefore, we
can use the rgmii_clock() helper to set this clock rate.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 .../stmicro/stmmac/dwmac-qcom-ethqos.c        | 23 ++++---------------
 1 file changed, 5 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index 192f270197c8..eafe637540b6 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -169,30 +169,17 @@ static void rgmii_dump(void *priv)
 		rgmii_readl(ethqos, EMAC_SYSTEM_LOW_POWER_DEBUG));
 }
 
-/* Clock rates */
-#define RGMII_1000_NOM_CLK_FREQ			(250 * 1000 * 1000UL)
-#define RGMII_ID_MODE_100_LOW_SVS_CLK_FREQ	 (50 * 1000 * 1000UL)
-#define RGMII_ID_MODE_10_LOW_SVS_CLK_FREQ	  (5 * 1000 * 1000UL)
-
 static void
 ethqos_update_link_clk(struct qcom_ethqos *ethqos, int speed)
 {
+	long rate;
+
 	if (!phy_interface_mode_is_rgmii(ethqos->phy_mode))
 		return;
 
-	switch (speed) {
-	case SPEED_1000:
-		ethqos->link_clk_rate =  RGMII_1000_NOM_CLK_FREQ;
-		break;
-
-	case SPEED_100:
-		ethqos->link_clk_rate =  RGMII_ID_MODE_100_LOW_SVS_CLK_FREQ;
-		break;
-
-	case SPEED_10:
-		ethqos->link_clk_rate =  RGMII_ID_MODE_10_LOW_SVS_CLK_FREQ;
-		break;
-	}
+	rate = rgmii_clock(speed);
+	if (rate > 0)
+		ethqos->link_clk_rate = rate * 2;
 
 	clk_set_rate(ethqos->link_clk, ethqos->link_clk_rate);
 }
-- 
2.30.2