netdev - [PATCH net-next 3/7] net: stmmac: stm32: use PHY capability for TX clock stop

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Message-Id: <E1trIAA-005ntW-OZ@rmk-PC.armlinux.org.uk>
Date: Sun, 09 Mar 2025 15:01:58 +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>,
	Christophe Roullier <christophe.roullier@...com>,
	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>
Subject: [PATCH net-next 3/7] net: stmmac: stm32: 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: Christophe Roullier <christophe.roullier@...com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
index 1fcb74e9e3ff..c3d321192581 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -538,6 +538,7 @@ static int stm32_dwmac_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	plat_dat->flags |= STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP;
 	plat_dat->bsp_priv = dwmac;
 
 	ret = stm32_dwmac_init(plat_dat, false);
-- 
2.30.2