linux-kernel - Re: [PATCH net-next] net: stmmac: dwc-qos: clean up clock initialisation

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Message-Id: <20250226102634.4584-1-swathi.ks@samsung.com>
Date: Wed, 26 Feb 2025 15:56:34 +0530
From: Swathi K S <swathi.ks@...sung.com>
To: rmk+kernel@...linux.org.uk
Cc: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, mcoquelin.stm32@...il.com,
	alexandre.torgue@...s.st.com, krzk+dt@...nel.org, swathi.ks@...sung.com,
	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	pankaj.dubey@...sung.com, ravi.patel@...sung.com, gost.dev@...sung.com
Subject: Re: [PATCH net-next] net: stmmac: dwc-qos: clean up clock
 initialisation

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>Message-Id: <E1tlRMP-004Vt5-W1@...-PC.armlinux.org.uk>
>Sender: Russell King <rmk@...linux.org.uk>
>Date: Fri, 21 Feb 2025 11:38:25 +0000
>
>Clean up the clock initialisation by providing a helper to find a
>named clock in the bulk clocks, and provide the name of the stmmac
>clock in match data so we can locate the stmmac clock in generic
>code.
>
>Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
>---
>dwc_eth_find_clk() should probably become a generic helper given that
>plat_dat->clks is part of the core platform support code, but that
>can be done later when converting more drivers - which I will get
>around to once I've got the set_clk_tx_rate() patch series out that
>someone else needs to make progress.
>
> .../stmicro/stmmac/dwmac-dwc-qos-eth.c        | 32 +++++++++++--------
> 1 file changed, 18 insertions(+), 14 deletions(-)
>
>diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
>index 392574bdd4a4..9e2035d1fb86 100644
>--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
>+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
>@@ -35,6 +35,16 @@ struct tegra_eqos {
> 	struct gpio_desc *reset;
> };
> 
>+static struct clk *dwc_eth_find_clk(struct plat_stmmacenet_data *plat_dat,
>+				    const char *name)
>+{
>+	for (int i = 0; i < plat_dat->num_clks; i++)
>+		if (strcmp(plat_dat->clks[i].id, name) == 0)
>+			return plat_dat->clks[i].clk;
>+
>+	return 0;
>+}
>+
> static int dwc_eth_dwmac_config_dt(struct platform_device *pdev,
> 				   struct plat_stmmacenet_data *plat_dat)
> {
>@@ -121,12 +131,7 @@ static int dwc_qos_probe(struct platform_device *pdev,
> 			 struct plat_stmmacenet_data *plat_dat,
> 			 struct stmmac_resources *stmmac_res)
> {
>-	for (int i = 0; i < plat_dat->num_clks; i++) {
>-		if (strcmp(plat_dat->clks[i].id, "apb_pclk") == 0)
>-			plat_dat->stmmac_clk = plat_dat->clks[i].clk;
>-		else if (strcmp(plat_dat->clks[i].id, "phy_ref_clk") == 0)
>-			plat_dat->pclk = plat_dat->clks[i].clk;
>-	}
>+	plat_dat->pclk = dwc_eth_find_clk(plat_dat, "phy_ref_clk");
> 
> 	return 0;
> }
>@@ -237,18 +242,12 @@ static int tegra_eqos_probe(struct platform_device *pdev,
> 
> 	eqos->dev = &pdev->dev;
> 	eqos->regs = res->addr;
>+	eqos->clk_slave = data->stmmac_clk;
> 
> 	if (!is_of_node(dev->fwnode))
> 		goto bypass_clk_reset_gpio;
> 
>-	for (int i = 0; i < data->num_clks; i++) {
>-		if (strcmp(data->clks[i].id, "slave_bus") == 0) {
>-			eqos->clk_slave = data->clks[i].clk;
>-			data->stmmac_clk = eqos->clk_slave;
>-		} else if (strcmp(data->clks[i].id, "tx") == 0) {
>-			eqos->clk_tx = data->clks[i].clk;
>-		}
>-	}
>+	eqos->clk_tx = dwc_eth_find_clk(data, "tx");
> 
> 	eqos->reset = devm_gpiod_get(&pdev->dev, "phy-reset", GPIOD_OUT_HIGH);
> 	if (IS_ERR(eqos->reset)) {
>@@ -312,15 +311,18 @@ struct dwc_eth_dwmac_data {
> 		     struct plat_stmmacenet_data *data,
> 		     struct stmmac_resources *res);
> 	void (*remove)(struct platform_device *pdev);
>+	const char *stmmac_clk_name;
> };
> 
> static const struct dwc_eth_dwmac_data dwc_qos_data = {
> 	.probe = dwc_qos_probe,
>+	.stmmac_clk_name = "apb_pclk",
> };
> 
> static const struct dwc_eth_dwmac_data tegra_eqos_data = {
> 	.probe = tegra_eqos_probe,
> 	.remove = tegra_eqos_remove,
>+	.stmmac_clk_name = "slave_bus",
> };
> 
> static int dwc_eth_dwmac_probe(struct platform_device *pdev)
>@@ -360,6 +362,8 @@ static int dwc_eth_dwmac_probe(struct platform_device *pdev)
> 	if (ret)
> 		return dev_err_probe(&pdev->dev, ret, "Failed to enable clocks\n");
> 
>+	data->stmmac_clk = dwc_eth_find_clk(plat_dat, data->stmmac_clk_name);
>+
> 	ret = data->probe(pdev, plat_dat, &stmmac_res);
> 	if (ret < 0) {
> 		dev_err_probe(&pdev->dev, ret, "failed to probe subdriver\n");

Hi Russell,
Tested this patch on FSD platform and it works.
Please feel free to add Tested-by: Swathi K S <swathi.ks@...sung.com>

-Swathi

>-- 
>2.30.2