netdev - [net-next PATCH 12/13] drivers: net: dsa: qca8k: add support for pws config reg

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Date:   Thu,  7 Oct 2021 00:36:02 +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>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Ansuel Smith <ansuelsmth@...il.com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [net-next PATCH 12/13] drivers: net: dsa: qca8k: add support for pws config reg

Some qca8327 switch require the power_on_sel enabled for the pws_reg or
sets the led to open drain.
Also qca8327 switch have a special mode to declare reduced 48pin layout.
This special mode is only present in qca8327 as qca8337 have a different
pws_reg table.
Introduce a new binding and support these special configuration.

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 drivers/net/dsa/qca8k.c | 26 ++++++++++++++++++++++++++
 drivers/net/dsa/qca8k.h |  3 +++
 2 files changed, 29 insertions(+)

diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c
index 01b05dfeae2b..209f8d3c9ea8 100644
--- a/drivers/net/dsa/qca8k.c
+++ b/drivers/net/dsa/qca8k.c
@@ -1014,6 +1014,28 @@ qca8k_setup_port0_pad_ctrl_reg(struct qca8k_priv *priv)
 	return ret;
 }
 
+static int
+qca8k_setup_of_pws_reg(struct qca8k_priv *priv)
+{
+	struct device_node *node = priv->dev->of_node;
+	u32 val = 0;
+
+	if (priv->switch_id == QCA8K_ID_QCA8327)
+		if (of_property_read_bool(node, "qca,package48"))
+			val |= QCA8327_PWS_PACKAGE48_EN;
+
+	if (of_property_read_bool(node, "qca,power-on-sel"))
+		val |= QCA8K_PWS_POWER_ON_SEL;
+
+	if (of_property_read_bool(node, "qca,led-open-drain"))
+		/* POWER_ON_SEL needs to be set when configuring led to open drain */
+		val |= QCA8K_PWS_LED_OPEN_EN_CSR | QCA8K_PWS_POWER_ON_SEL;
+
+	return qca8k_rmw(priv, QCA8K_REG_PWS,
+			QCA8K_PWS_LED_OPEN_EN_CSR | QCA8K_PWS_POWER_ON_SEL,
+			val);
+}
+
 static int
 qca8k_setup(struct dsa_switch *ds)
 {
@@ -1039,6 +1061,10 @@ qca8k_setup(struct dsa_switch *ds)
 	if (ret)
 		return ret;
 
+	ret = qca8k_setup_of_pws_reg(priv);
+	if (ret)
+		return ret;
+
 	ret = qca8k_setup_of_rgmii_delay(priv);
 	if (ret)
 		return ret;
diff --git a/drivers/net/dsa/qca8k.h b/drivers/net/dsa/qca8k.h
index 3fded69a6839..90f4616c33f1 100644
--- a/drivers/net/dsa/qca8k.h
+++ b/drivers/net/dsa/qca8k.h
@@ -48,6 +48,9 @@
 #define   QCA8K_MAX_DELAY				3
 #define   QCA8K_PORT_PAD_SGMII_EN			BIT(7)
 #define QCA8K_REG_PWS					0x010
+#define   QCA8K_PWS_POWER_ON_SEL			BIT(31)
+#define   QCA8327_PWS_PACKAGE48_EN			BIT(30)
+#define   QCA8K_PWS_LED_OPEN_EN_CSR			BIT(24)
 #define   QCA8K_PWS_SERDES_AEN_DIS			BIT(7)
 #define QCA8K_REG_MODULE_EN				0x030
 #define   QCA8K_MODULE_EN_MIB				BIT(0)
-- 
2.32.0