linux-kernel - [RFC Patch net-next 01/10] net: dsa: microchip: lan937x: read rgmii delay from device tree

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Message-ID: <20220712160308.13253-2-arun.ramadoss@microchip.com>
Date:   Tue, 12 Jul 2022 21:32:59 +0530
From:   Arun Ramadoss <arun.ramadoss@...rochip.com>
To:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     Woojung Huh <woojung.huh@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>, 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>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Russell King" <linux@...linux.org.uk>
Subject: [RFC Patch net-next 01/10] net: dsa: microchip: lan937x: read rgmii delay from device tree

This patch read the rgmii tx and rx delay from device tree and stored it
in the ksz_port.

Signed-off-by: Arun Ramadoss <arun.ramadoss@...rochip.com>
---
 drivers/net/dsa/microchip/ksz_common.c | 16 ++++++++++++++++
 drivers/net/dsa/microchip/ksz_common.h |  2 ++
 2 files changed, 18 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 28d7cb2ce98f..4bc6277b4361 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -1499,6 +1499,7 @@ int ksz_switch_register(struct ksz_device *dev)
 	struct device_node *port, *ports;
 	phy_interface_t interface;
 	unsigned int port_num;
+	u32 *value;
 	int ret;
 	int i;
 
@@ -1589,6 +1590,21 @@ int ksz_switch_register(struct ksz_device *dev)
 				}
 				of_get_phy_mode(port,
 						&dev->ports[port_num].interface);
+
+				if (!dev->info->supports_rgmii[port_num])
+					continue;
+
+				value = &dev->ports[port_num].rgmii_rx_val;
+				if (of_property_read_u32(port,
+							 "rx-internal-delay-ps",
+							 value))
+					*value = 0;
+
+				value = &dev->ports[port_num].rgmii_tx_val;
+				if (of_property_read_u32(port,
+							 "tx-internal-delay-ps",
+							 value))
+					*value = 0;
 			}
 		dev->synclko_125 = of_property_read_bool(dev->dev->of_node,
 							 "microchip,synclko-125");
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index d5dddb7ec045..41fe6388af9e 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -77,6 +77,8 @@ struct ksz_port {
 	struct ksz_port_mib mib;
 	phy_interface_t interface;
 	u16 max_frame;
+	u32 rgmii_tx_val;
+	u32 rgmii_rx_val;
 };
 
 struct ksz_device {
-- 
2.36.1