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

["Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>]

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@armlinux.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");
-- 
2.30.2