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From:   Christophe Roullier <christophe.roullier@st.com>
To:     <robh@kernel.org>, <davem@davemloft.net>, <joabreu@synopsys.com>,
        <mark.rutland@arm.com>, <mcoquelin.stm32@gmail.com>,
        <alexandre.torgue@st.com>, <peppe.cavallaro@st.com>
CC:     <linux-stm32@st-md-mailman.stormreply.com>,
        <linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <netdev@vger.kernel.org>,
        <christophe.roullier@st.com>, <andrew@lunn.ch>
Subject: [PATCH V3 net-next 1/4] net: ethernet: stmmac: Add support for syscfg clock
Date:   Wed, 6 Nov 2019 11:12:17 +0100
Message-ID: <20191106101220.12693-2-christophe.roullier@st.com>
In-Reply-To: <20191106101220.12693-1-christophe.roullier@st.com>
References: <20191106101220.12693-1-christophe.roullier@st.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@st.com>
---
 .../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 28 +++++++++++--------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
index 4ef041bdf6a1..be7d58d83cfa 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -152,19 +152,24 @@ static int stm32mp1_clk_prepare(struct stm32_dwmac *dwmac, bool prepare)
 	int ret = 0;
 
 	if (prepare) {
-		ret = clk_prepare_enable(dwmac->syscfg_clk);
-		if (ret)
-			return ret;
-
+		if (dwmac->syscfg_clk) {
+			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);
+				if (dwmac->syscfg_clk)
+					clk_disable_unprepare
+						(dwmac->syscfg_clk);
 				return ret;
 			}
 		}
 	} else {
-		clk_disable_unprepare(dwmac->syscfg_clk);
+		if (dwmac->syscfg_clk)
+			clk_disable_unprepare(dwmac->syscfg_clk);
+
 		if (dwmac->clk_eth_ck)
 			clk_disable_unprepare(dwmac->clk_eth_ck);
 	}
@@ -320,12 +325,10 @@ 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.
@@ -436,7 +439,8 @@ static int stm32mp1_suspend(struct stm32_dwmac *dwmac)
 		return ret;
 
 	clk_disable_unprepare(dwmac->clk_tx);
-	clk_disable_unprepare(dwmac->syscfg_clk);
+	if (dwmac->syscfg_clk)
+		clk_disable_unprepare(dwmac->syscfg_clk);
 	if (dwmac->clk_eth_ck)
 		clk_disable_unprepare(dwmac->clk_eth_ck);
 
-- 
2.17.1