linux-kernel - [net-next PATCH v6 08/16] net: dsa: qca8k: add explicit SGMII PLL enable

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Date:   Wed, 13 Oct 2021 03:16:14 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        John Crispin <john@...ozen.org>,
        Ansuel Smith <ansuelsmth@...il.com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: [net-next PATCH v6 08/16] net: dsa: qca8k: add explicit SGMII PLL enable

Support enabling PLL on the SGMII CPU port. Some device require this
special configuration or no traffic is transmitted and the switch
doesn't work at all. A dedicated binding is added to the CPU node
port to apply the correct reg on mac config.
Fail to correctly configure sgmii with qca8327 switch and warn if pll is
used on qca8337 with a revision greater than 1.

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/dsa/qca8k.c | 19 +++++++++++++++++--
 drivers/net/dsa/qca8k.h |  1 +
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index 3b1874bf5d7d..486e8a3d9af5 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -1002,6 +1002,18 @@ qca8k_parse_port_config(struct qca8k_priv *priv)
 			if (of_property_read_bool(port_dn, "qca,sgmii-rxclk-falling-edge"))
 				priv->sgmii_rx_clk_falling_edge = true;
 
+			if (of_property_read_bool(port_dn, "qca,sgmii-enable-pll")) {
+				priv->sgmii_enable_pll = true;
+
+				if (priv->switch_id == QCA8K_ID_QCA8327) {
+					dev_err(priv->dev, "SGMII PLL should NOT be enabled for qca8327. Aborting enabling");
+					priv->sgmii_enable_pll = false;
+				}
+
+				if (priv->switch_revision < 2)
+					dev_warn(priv->dev, "SGMII PLL should NOT be enabled for qca8337 with revision 2 or more.");
+			}
+
 			break;
 		default:
 			continue;
@@ -1313,8 +1325,11 @@ qca8k_phylink_mac_config(struct dsa_switch *ds, int port, unsigned int mode,
 		if (ret)
 			return;
 
-		val |= QCA8K_SGMII_EN_PLL | QCA8K_SGMII_EN_RX |
-			QCA8K_SGMII_EN_TX | QCA8K_SGMII_EN_SD;
+		val |= QCA8K_SGMII_EN_SD;
+
+		if (priv->sgmii_enable_pll)
+			val |= QCA8K_SGMII_EN_PLL | QCA8K_SGMII_EN_RX |
+			       QCA8K_SGMII_EN_TX;
 
 		if (dsa_is_cpu_port(ds, port)) {
 			/* CPU port, we're talking to the CPU MAC, be a PHY */
diff --git a/drivers/net/dsa/qca8k.h b/drivers/net/dsa/qca8k.h
index 5eb0c890dfe4..77b1677edafa 100644
--- a/drivers/net/dsa/qca8k.h
+++ b/drivers/net/dsa/qca8k.h
@@ -266,6 +266,7 @@ struct qca8k_priv {
 	u8 switch_revision;
 	bool sgmii_rx_clk_falling_edge;
 	bool sgmii_tx_clk_falling_edge;
+	bool sgmii_enable_pll;
 	u8 rgmii_rx_delay[QCA8K_NUM_CPU_PORTS]; /* 0: CPU port0, 1: CPU port6 */
 	u8 rgmii_tx_delay[QCA8K_NUM_CPU_PORTS]; /* 0: CPU port0, 1: CPU port6 */
 	bool legacy_phy_port_mapping;
-- 
2.32.0