linux-kernel - [PATCH net-next 5/5] net: stmmac: stm32: Use syscon_regmap_lookup_by_phandle

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Message-Id: <20250112-syscon-phandle-args-net-v1-5-3423889935f7@linaro.org>
Date: Sun, 12 Jan 2025 14:32:47 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: MD Danish Anwar <danishanwar@...com>, Roger Quadros <rogerq@...nel.org>, 
 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>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Jose Abreu <joabreu@...opsys.com>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, 
 imx@...ts.linux.dev, Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH net-next 5/5] net: stmmac: stm32: Use
 syscon_regmap_lookup_by_phandle_args

Use syscon_regmap_lookup_by_phandle_args() which is a wrapper over
syscon_regmap_lookup_by_phandle() combined with getting the syscon
argument.  Except simpler code this annotates within one line that given
phandle has arguments, so grepping for code would be easier.

There is also no real benefit in printing errors on missing syscon
argument, because this is done just too late: runtime check on
static/build-time data.  Dtschema and Devicetree bindings offer the
static/build-time check for this already.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
index 1e8bac665cc9bc95c3aa96e87a8e95d9c63ba8e1..1fcb74e9e3ffacdc7581b267febb55d015a83aed 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -419,16 +419,11 @@ static int stm32_dwmac_parse_data(struct stm32_dwmac *dwmac,
 	}

 	/* Get mode register */
-	dwmac->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscon");
+	dwmac->regmap = syscon_regmap_lookup_by_phandle_args(np, "st,syscon",
+							     1, &dwmac->mode_reg);
 	if (IS_ERR(dwmac->regmap))
 		return PTR_ERR(dwmac->regmap);

-	err = of_property_read_u32_index(np, "st,syscon", 1, &dwmac->mode_reg);
-	if (err) {
-		dev_err(dev, "Can't get sysconfig mode offset (%d)\n", err);
-		return err;
-	}
-
 	if (dwmac->ops->is_mp2)
 		return 0;

-- 
2.43.0