netdev - [PATCH V2 4/4] net: ethernet: ravb: Enable optional refclk

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Date:   Fri, 15 Jan 2021 14:19:51 -0600
From:   Adam Ford <aford173@...il.com>
To:     linux-renesas-soc@...r.kernel.org
Cc:     aford@...conembedded.com, Adam Ford <aford173@...il.com>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V2 4/4] net: ethernet: ravb: Enable optional refclk

For devices that use a programmable clock for the avb reference clock,
the driver may need to enable them.  Add code to find the optional clock
and enable it when available.

Signed-off-by: Adam Ford <aford173@...il.com>
---
 drivers/net/ethernet/renesas/ravb.h      | 1 +
 drivers/net/ethernet/renesas/ravb_main.c | 8 ++++++++
 2 files changed, 9 insertions(+)

V2:  The previous patch to fetch the fclk was dropped.  In its place
     is code to enable the refclk

diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 7453b17a37a2..ff363797bd2b 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -994,6 +994,7 @@ struct ravb_private {
 	struct platform_device *pdev;
 	void __iomem *addr;
 	struct clk *clk;
+	struct clk *refclk;
 	struct mdiobb_ctrl mdiobb;
 	u32 num_rx_ring[NUM_RX_QUEUE];
 	u32 num_tx_ring[NUM_TX_QUEUE];
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index bd30505fbc57..739e30f45daa 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2148,6 +2148,14 @@ static int ravb_probe(struct platform_device *pdev)
 		goto out_release;
 	}
 
+	priv->refclk = devm_clk_get_optional(&pdev->dev, "refclk");
+	if (IS_ERR(priv->refclk)) {
+		error = PTR_ERR(priv->refclk);
+		goto out_release;
+	} else {
+		(void)clk_prepare_enable(priv->refclk);
+	}
+
 	ndev->max_mtu = 2048 - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN);
 	ndev->min_mtu = ETH_MIN_MTU;
 
-- 
2.25.1