linux-kernel - [PATCH v8 11/14] net: phy: at803x: add qca808x initial config sequence

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Message-ID: <20231215074005.26976-12-quic_luoj@quicinc.com>
Date: Fri, 15 Dec 2023 15:40:01 +0800
From: Luo Jie <quic_luoj@...cinc.com>
To: <andrew@...n.ch>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <hkallweit1@...il.com>, <linux@...linux.org.uk>, <corbet@....net>,
        <p.zabel@...gutronix.de>, <f.fainelli@...il.com>
CC: <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>
Subject: [PATCH v8 11/14] net: phy: at803x: add qca808x initial config sequence

After GPIO reset, these Ethernet clock sequence needs to be
configured before reading the features of PHY, the Ethernet
system clock works on 25MHZ.

Signed-off-by: Luo Jie <quic_luoj@...cinc.com>
---
 drivers/net/phy/at803x.c | 84 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 83 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index 4c884d6b60bc..9885a728c72a 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -897,6 +897,84 @@ static int qca8084_parse_dt(struct phy_device *phydev)
 	return 0;
 }
 
+static int qca8084_clock_config(struct phy_device *phydev)
+{
+	struct at803x_priv *priv;
+	int ret = 0;
+
+	/* The ethernet clock IDs are only defined in one PHY device
+	 * tree node, and these ethernet clocks only needs to be configured
+	 * one time, which work on the clock rate 25MHZ.
+	 */
+	priv = phydev->priv;
+	if (!priv->clk[SRDS0_SYS_CLK])
+		return 0;
+
+	ret = clk_set_rate(priv->clk[SRDS0_SYS_CLK], 25000000);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(priv->clk[SRDS0_SYS_CLK]);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(priv->clk[SRDS1_SYS_CLK]);
+	if (ret)
+		return ret;
+
+	/* Reset PCS system clocks */
+	reset_control_assert(priv->reset[SRDS0_SYS_RESET]);
+	reset_control_assert(priv->reset[SRDS1_SYS_RESET]);
+	fsleep(20000);
+
+	reset_control_deassert(priv->reset[SRDS0_SYS_RESET]);
+	reset_control_deassert(priv->reset[SRDS1_SYS_RESET]);
+
+	ret = clk_prepare_enable(priv->clk[GEPHY0_SYS_CLK]);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(priv->clk[GEPHY1_SYS_CLK]);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(priv->clk[GEPHY2_SYS_CLK]);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(priv->clk[GEPHY3_SYS_CLK]);
+	if (ret)
+		return ret;
+
+	/* Reset ethernet system clocks */
+	reset_control_assert(priv->reset[GEPHY0_SYS_RESET]);
+	reset_control_assert(priv->reset[GEPHY1_SYS_RESET]);
+	reset_control_assert(priv->reset[GEPHY2_SYS_RESET]);
+	reset_control_assert(priv->reset[GEPHY3_SYS_RESET]);
+	fsleep(20000);
+
+	reset_control_deassert(priv->reset[GEPHY0_SYS_RESET]);
+	reset_control_deassert(priv->reset[GEPHY1_SYS_RESET]);
+	reset_control_deassert(priv->reset[GEPHY2_SYS_RESET]);
+	reset_control_deassert(priv->reset[GEPHY3_SYS_RESET]);
+
+	/* Release ethernet DSP reset */
+	reset_control_deassert(priv->reset[GEPHY0_RESET]);
+	reset_control_deassert(priv->reset[GEPHY1_RESET]);
+	reset_control_deassert(priv->reset[GEPHY2_RESET]);
+	reset_control_deassert(priv->reset[GEPHY3_RESET]);
+	reset_control_deassert(priv->reset[GEPHY_DSP_RESET]);
+
+	/* Enable efuse loading into analog circuit */
+	ret = qca8084_mii_modify(phydev, QCA8084_EPHY_CFG,
+				 QCA8084_EPHY_LDO_EN, 0);
+	if (ret)
+		return ret;
+
+	fsleep(10000);
+	return 0;
+}
+
 static int qca8084_probe(struct phy_device *phydev)
 {
 	int ret;
@@ -905,7 +983,11 @@ static int qca8084_probe(struct phy_device *phydev)
 	if (ret)
 		return ret;
 
-	return qca8084_parse_and_set_phyaddr(phydev);
+	ret = qca8084_parse_and_set_phyaddr(phydev);
+	if (ret)
+		return ret;
+
+	return qca8084_clock_config(phydev);
 }
 
 static int at803x_probe(struct phy_device *phydev)
-- 
2.42.0