linux-kernel - [PATCH v3 2/3] phy: ti: gmii-sel: Update methods for fetching and using qsgmii main port

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Date:   Wed, 26 Oct 2022 13:15:31 +0530
From:   Siddharth Vadapalli <s-vadapalli@...com>
To:     <robh+dt@...nel.org>, <lee@...nel.org>,
        <krzysztof.kozlowski@...aro.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <kishon@...nel.org>,
        <vkoul@...nel.org>, <dan.carpenter@...cle.com>, <rogerq@...nel.org>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-phy@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>, <s-vadapalli@...com>
Subject: [PATCH v3 2/3] phy: ti: gmii-sel: Update methods for fetching and using qsgmii main port

The number of QSGMII main ports are specific to the device. TI's J7200 for
which the QSGMII main port property is fetched from the device-tree has
only one QSGMII main port. However, devices like TI's J721e support up to
two QSGMII main ports. Thus, the existing methods for fetching and using
the QSGMII main port are not scalable.

Update the existing methods for handling the QSGMII main ports and its
associated requirements to make it scalable for future devices.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---
 drivers/phy/ti/phy-gmii-sel.c | 29 ++++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/drivers/phy/ti/phy-gmii-sel.c b/drivers/phy/ti/phy-gmii-sel.c
index 0bcfd6d96b4d..c8f30d2e1f46 100644
--- a/drivers/phy/ti/phy-gmii-sel.c
+++ b/drivers/phy/ti/phy-gmii-sel.c
@@ -50,6 +50,7 @@ struct phy_gmii_sel_soc_data {
 	const struct reg_field (*regfields)[PHY_GMII_SEL_LAST];
 	bool use_of_data;
 	u64 extra_modes;
+	u32 num_qsgmii_main_ports;
 };
 
 struct phy_gmii_sel_priv {
@@ -213,6 +214,8 @@ struct phy_gmii_sel_soc_data phy_gmii_sel_cpsw5g_soc_j7200 = {
 	.use_of_data = true,
 	.regfields = phy_gmii_sel_fields_am654,
 	.extra_modes = BIT(PHY_INTERFACE_MODE_QSGMII),
+	.num_ports = 4,
+	.num_qsgmii_main_ports = 1,
 };
 
 static const struct of_device_id phy_gmii_sel_id_table[] = {
@@ -378,11 +381,13 @@ static int phy_gmii_sel_init_ports(struct phy_gmii_sel_priv *priv)
 static int phy_gmii_sel_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	const struct phy_gmii_sel_soc_data *soc_data;
 	struct device_node *node = dev->of_node;
 	const struct of_device_id *of_id;
 	struct phy_gmii_sel_priv *priv;
 	u32 main_ports = 1;
 	int ret;
+	u32 i;
 
 	of_id = of_match_node(phy_gmii_sel_id_table, pdev->dev.of_node);
 	if (!of_id)
@@ -394,16 +399,26 @@ static int phy_gmii_sel_probe(struct platform_device *pdev)
 
 	priv->dev = &pdev->dev;
 	priv->soc_data = of_id->data;
+	soc_data = priv->soc_data;
 	priv->num_ports = priv->soc_data->num_ports;
-	of_property_read_u32(node, "ti,qsgmii-main-ports", &main_ports);
+	priv->qsgmii_main_ports = 0;
+
 	/*
-	 * Ensure that main_ports is within bounds. If the property
-	 * ti,qsgmii-main-ports is not mentioned, or the value mentioned
-	 * is out of bounds, default to 1.
+	 * Based on the compatible, try to read the appropriate number of
+	 * QSGMII main ports from the "ti,qsgmii-main-ports" property from
+	 * the device-tree node.
 	 */
-	if (main_ports < 1 || main_ports > 4)
-		main_ports = 1;
-	priv->qsgmii_main_ports = PHY_GMII_PORT(main_ports);
+	for (i = 0; i < soc_data->num_qsgmii_main_ports; i++) {
+		of_property_read_u32_index(node, "ti,qsgmii-main-ports", i, &main_ports);
+		/*
+		 * Ensure that main_ports is within bounds.
+		 */
+		if (main_ports < 1 || main_ports > soc_data->num_ports) {
+			dev_err(dev, "Invalid qsgmii main port provided\n");
+			return -EINVAL;
+		}
+		priv->qsgmii_main_ports |= PHY_GMII_PORT(main_ports);
+	}
 
 	priv->regmap = syscon_node_to_regmap(node->parent);
 	if (IS_ERR(priv->regmap)) {
-- 
2.25.1