netdev - [PATCH net-next 2/7] net: stmmac: starfive: use PHY capability for TX clock stop

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Message-Id: <E1trIA5-005ntQ-KM@rmk-PC.armlinux.org.uk>
Date: Sun, 09 Mar 2025 15:01:53 +0000
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Conor Dooley <conor+dt@...nel.org>,
	Conor Dooley <conor@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	devicetree@...r.kernel.org,
	Emil Renner Berthing <kernel@...il.dk>,
	Eric Dumazet <edumazet@...gle.com>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jose Abreu <joabreu@...opsys.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-riscv@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Minda Chen <minda.chen@...rfivetech.com>,
	netdev@...r.kernel.org,
	Palmer Dabbelt <palmer@...belt.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Rob Herring <robh@...nel.org>,
	Samin Guo <samin.guo@...rfivetech.com>
Subject: [PATCH net-next 2/7] net: stmmac: starfive: use PHY capability for TX
 clock stop

Whether the MII transmit clock can be stopped is primarily a property
of the PHY (there is a capability bit that should be checked first.)
Whether the MAC is capable of stopping the transmit clock is a separate
issue, but this is already handled by the core DesignWare MAC code.

Add the flag to allow the stmmac core to use the PHY capability.

Cc: Samin Guo <samin.guo@...rfivetech.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
index 5e31cb3bb4b8..2013d7477eb7 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
@@ -124,6 +124,7 @@ static int starfive_dwmac_probe(struct platform_device *pdev)
 		plat_dat->set_clk_tx_rate = stmmac_set_clk_tx_rate;
 
 	dwmac->dev = &pdev->dev;
+	plat_dat->flags |= STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP;
 	plat_dat->bsp_priv = dwmac;
 	plat_dat->dma_cfg->dche = true;
 
-- 
2.30.2