linux-kernel - [PATCH V4 net-next 1/4] net: ethernet: stmmac: Add support for syscfg clock

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Date:   Thu, 7 Nov 2019 09:47:54 +0100
From:   Christophe Roullier <christophe.roullier@...com>
To:     <robh@...nel.org>, <davem@...emloft.net>, <joabreu@...opsys.com>,
        <mark.rutland@....com>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...com>, <peppe.cavallaro@...com>
CC:     <linux-stm32@...md-mailman.stormreply.com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <netdev@...r.kernel.org>,
        <christophe.roullier@...com>, <andrew@...n.ch>
Subject: [PATCH V4 net-next 1/4] net: ethernet: stmmac: Add support for syscfg clock

Add optional support for syscfg clock in dwmac-stm32.c
Now Syscfg clock is activated automatically when syscfg
registers are used

Signed-off-by: Christophe Roullier <christophe.roullier@...com>
---
 .../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 23 +++++++------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
index 4ef041bdf6a1..9e4180e1683f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -155,18 +155,14 @@ static int stm32mp1_clk_prepare(struct stm32_dwmac *dwmac, bool prepare)
 		ret = clk_prepare_enable(dwmac->syscfg_clk);
 		if (ret)
 			return ret;
-
-		if (dwmac->clk_eth_ck) {
-			ret = clk_prepare_enable(dwmac->clk_eth_ck);
-			if (ret) {
-				clk_disable_unprepare(dwmac->syscfg_clk);
+		ret = clk_prepare_enable(dwmac->clk_eth_ck);
+		if (ret) {
+			clk_disable_unprepare(dwmac->syscfg_clk);
 				return ret;
-			}
 		}
 	} else {
 		clk_disable_unprepare(dwmac->syscfg_clk);
-		if (dwmac->clk_eth_ck)
-			clk_disable_unprepare(dwmac->clk_eth_ck);
+		clk_disable_unprepare(dwmac->clk_eth_ck);
 	}
 	return ret;
 }
@@ -320,12 +316,10 @@ static int stm32mp1_parse_data(struct stm32_dwmac *dwmac,
 		return PTR_ERR(dwmac->clk_ethstp);
 	}
 
-	/*  Clock for sysconfig */
+	/*  Optional Clock for sysconfig */
 	dwmac->syscfg_clk = devm_clk_get(dev, "syscfg-clk");
-	if (IS_ERR(dwmac->syscfg_clk)) {
-		dev_err(dev, "No syscfg clock provided...\n");
-		return PTR_ERR(dwmac->syscfg_clk);
-	}
+	if (IS_ERR(dwmac->syscfg_clk))
+		dwmac->syscfg_clk = NULL;
 
 	/* Get IRQ information early to have an ability to ask for deferred
 	 * probe if needed before we went too far with resource allocation.
@@ -437,8 +431,7 @@ static int stm32mp1_suspend(struct stm32_dwmac *dwmac)
 
 	clk_disable_unprepare(dwmac->clk_tx);
 	clk_disable_unprepare(dwmac->syscfg_clk);
-	if (dwmac->clk_eth_ck)
-		clk_disable_unprepare(dwmac->clk_eth_ck);
+	clk_disable_unprepare(dwmac->clk_eth_ck);
 
 	return ret;
 }
-- 
2.17.1