linux-kernel - [PATCHv2 1/2] net: ethernet: stmmac: dwmac-rk: rework optional clock handling

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Message-Id: <20230405161043.46190-2-sebastian.reichel@collabora.com>
Date:   Wed,  5 Apr 2023 18:10:42 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>
Cc:     "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>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        kernel@...labora.com
Subject: [PATCHv2 1/2] net: ethernet: stmmac: dwmac-rk: rework optional clock handling

The clock requesting code is quite repetitive. Fix this by requesting
the clocks in a loop. Also use devm_clk_get_optional instead of
devm_clk_get, since the old code effectively handles them as optional
clocks. This removes error messages about missing clocks for platforms
not using them and correct -EPROBE_DEFER handling.

The new code also tries to get "clk_mac_ref" and "clk_mac_refout" when
the PHY is not configured as PHY_INTERFACE_MODE_RMII to keep the code
simple. This is possible since we use devm_clk_get_optional() for the
clock lookup anyways.

Suggested-by: Jakub Kicinski <kuba@...nel.org>
Fixes: 7ad269ea1a2b7 ("GMAC: add driver for Rockchip RK3288 SoCs integrated GMAC")
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
---
 .../net/ethernet/stmicro/stmmac/dwmac-rk.c    | 63 ++++++-------------
 1 file changed, 20 insertions(+), 43 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index 4b8fd11563e4..6fdad0f10d6f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -1475,54 +1475,31 @@ static int rk_gmac_clk_init(struct plat_stmmacenet_data *plat)
 {
 	struct rk_priv_data *bsp_priv = plat->bsp_priv;
 	struct device *dev = &bsp_priv->pdev->dev;
-	int ret;
+	int i, ret;
+	struct {
+		struct clk **ptr;
+		const char *name;
+	} clocks[] = {
+		{ &bsp_priv->mac_clk_rx, "mac_clk_rx" },
+		{ &bsp_priv->mac_clk_tx, "mac_clk_tx" },
+		{ &bsp_priv->aclk_mac, "aclk_mac" },
+		{ &bsp_priv->pclk_mac, "pclk_mac" },
+		{ &bsp_priv->clk_mac, "stmmaceth" },
+		{ &bsp_priv->clk_mac_ref, "clk_mac_ref" },
+		{ &bsp_priv->clk_mac_refout, "clk_mac_refout" },
+		{ &bsp_priv->clk_mac_speed, "clk_mac_speed" },
+	};
 
 	bsp_priv->clk_enabled = false;
 
-	bsp_priv->mac_clk_rx = devm_clk_get(dev, "mac_clk_rx");
-	if (IS_ERR(bsp_priv->mac_clk_rx))
-		dev_err(dev, "cannot get clock %s\n",
-			"mac_clk_rx");
-
-	bsp_priv->mac_clk_tx = devm_clk_get(dev, "mac_clk_tx");
-	if (IS_ERR(bsp_priv->mac_clk_tx))
-		dev_err(dev, "cannot get clock %s\n",
-			"mac_clk_tx");
-
-	bsp_priv->aclk_mac = devm_clk_get(dev, "aclk_mac");
-	if (IS_ERR(bsp_priv->aclk_mac))
-		dev_err(dev, "cannot get clock %s\n",
-			"aclk_mac");
-
-	bsp_priv->pclk_mac = devm_clk_get(dev, "pclk_mac");
-	if (IS_ERR(bsp_priv->pclk_mac))
-		dev_err(dev, "cannot get clock %s\n",
-			"pclk_mac");
-
-	bsp_priv->clk_mac = devm_clk_get(dev, "stmmaceth");
-	if (IS_ERR(bsp_priv->clk_mac))
-		dev_err(dev, "cannot get clock %s\n",
-			"stmmaceth");
-
-	if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII) {
-		bsp_priv->clk_mac_ref = devm_clk_get(dev, "clk_mac_ref");
-		if (IS_ERR(bsp_priv->clk_mac_ref))
-			dev_err(dev, "cannot get clock %s\n",
-				"clk_mac_ref");
-
-		if (!bsp_priv->clock_input) {
-			bsp_priv->clk_mac_refout =
-				devm_clk_get(dev, "clk_mac_refout");
-			if (IS_ERR(bsp_priv->clk_mac_refout))
-				dev_err(dev, "cannot get clock %s\n",
-					"clk_mac_refout");
-		}
+	for (i=0; i < ARRAY_SIZE(clocks); i++) {
+		*clocks[i].ptr = devm_clk_get_optional(dev, clocks[i].name);
+		if (IS_ERR(*clocks[i].ptr))
+			return dev_err_probe(dev, PTR_ERR(*clocks[i].ptr),
+					     "cannot get clock %s\n",
+					     clocks[i].name);
 	}
 
-	bsp_priv->clk_mac_speed = devm_clk_get(dev, "clk_mac_speed");
-	if (IS_ERR(bsp_priv->clk_mac_speed))
-		dev_err(dev, "cannot get clock %s\n", "clk_mac_speed");
-
 	if (bsp_priv->clock_input) {
 		dev_info(dev, "clock input from PHY\n");
 	} else {
-- 
2.39.2