[PATCH 3/4] net: dsa: LAN9303: add I2C managed mode support

From: Juergen Borleis
Date: Wed Apr 05 2017 - 05:23:09 EST

In this mode the switch device and the internal phys will be managed via
I2C interface. The MDIO interface is still supported, but for the
(emulated) CPU port only.

Signed-off-by: Juergen Borleis <jbe@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/net/dsa/lan9303.txt | 74 ++++++++++++++
drivers/net/phy/Kconfig | 17 ++++
drivers/net/phy/Makefile | 5 +
drivers/net/phy/lan9303_i2c.c | 109 +++++++++++++++++++++
4 files changed, 205 insertions(+)
create mode 100644 Documentation/devicetree/bindings/net/dsa/lan9303.txt
create mode 100644 drivers/net/phy/lan9303_i2c.c

diff --git a/Documentation/devicetree/bindings/net/dsa/lan9303.txt b/Documentation/devicetree/bindings/net/dsa/lan9303.txt
new file mode 100644
index 0000000000000..2c8a466065a27
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/dsa/lan9303.txt
@@ -0,0 +1,74 @@
+SMSC/MicroChip LAN9303 three port ethernet switch
+-------------------------------------------------
+
+Required properties:
+
+- compatible: should be "smsc,lan9303"
+- #size-cells: must be 0
+- #address-cells: must be 1
+
+Optional properties:
+
+- phy-reset-gpios: GPIO to be used to reset the whole device, always low active
+- phy-reset-duration: reset duration, defaults to 200 ms
+
+Subnodes:
+
+The integrated switch subnode should be specified according to the binding
+described in dsa/dsa.txt. The CPU port of this switch is always port 0.
+
+Example:
+
+I2C managed mode:
+
+ master: masterdevice@X {
+ phy-handle = <&ethphy>;
+ status = "okay";
+
+ mdio {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ ethphy: ethernet-phy@0 {
+ compatible = "ethernet-phy-ieee802.3-c22";
+ reg = <0>;
+ max-speed = <100>;
+ };
+ };
+
+ };
+
+ switch: switch@a {
+ compatible = "smsc,lan9303";
+ reg = <0xa>;
+ status = "okay";
+ interrupts-extended = <&gpio2 7 IRQ_TYPE_LEVEL_LOW>;
+ phy-reset-gpios = <&gpio7 6 GPIO_ACTIVE_LOW>;
+ phy-reset-duration = <200>;
+
+ dsa,member = <0 0>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port@0 { /* RMII fixed link to master */
+ reg = <0>;
+ label = "cpu";
+ ethernet = <&master>;
+ max-speed = <100>;
+ };
+
+ port@1 { /* external port 1 */
+ compatible = "ethernet-phy-ieee802.3-c22";
+ reg = <1>;
+ label = "lan1;
+ };
+
+ port@2 { /* external port 2 */
+ compatible = "ethernet-phy-ieee802.3-c22";
+ reg = <2>;
+ label = "lan2";
+ };
+ };
+ };
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 8dbd59baa34d5..acbc73adbf8c3 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -345,3 +345,20 @@ endif # PHYLIB
config MICREL_KS8995MA
tristate "Micrel KS8995MA 5-ports 10/100 managed Ethernet switch"
depends on SPI
+
+config SMSC_LAN9303
+ tristate "SMSC LAN9303 3-ports 10/100 ethernet switch"
+ depends on NET_DSA
+ select NET_DSA_TAG_LAN9303
+ help
+ This module provides a driver for SMSC LAN9303 3 port ethernet
+ switch.
+
+config SMSC_LAN9303_I2C
+ bool "I2C managed mode"
+ depends on SMSC_LAN9303
+ depends on I2C && OF
+ select REGMAP_I2C
+ help
+ Provide access functions if the SMSC LAN9303 is configured for I2C
+ managed mode.
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 407b0b601ea82..4313adec2e8b6 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -7,6 +7,10 @@ libphy-$(CONFIG_LED_TRIGGER_PHY) += phy_led_triggers.o

obj-$(CONFIG_PHYLIB) += libphy.o

+lan9303-objs-y := lan9303-core.o
+lan9303-objs-$(CONFIG_SMSC_LAN9303_I2C) += lan9303_i2c.o
+lan9303-objs := $(lan9303-objs-y)
+
obj-$(CONFIG_MDIO_BCM_IPROC) += mdio-bcm-iproc.o
obj-$(CONFIG_MDIO_BCM_UNIMAC) += mdio-bcm-unimac.o
obj-$(CONFIG_MDIO_BITBANG) += mdio-bitbang.o
@@ -52,6 +56,7 @@ obj-$(CONFIG_NATIONAL_PHY) += national.o
obj-$(CONFIG_QSEMI_PHY) += qsemi.o
obj-$(CONFIG_REALTEK_PHY) += realtek.o
obj-$(CONFIG_SMSC_PHY) += smsc.o
+obj-$(CONFIG_SMSC_LAN9303) += lan9303.o
obj-$(CONFIG_STE10XP) += ste10Xp.o
obj-$(CONFIG_TERANETICS_PHY) += teranetics.o
obj-$(CONFIG_VITESSE_PHY) += vitesse.o
diff --git a/drivers/net/phy/lan9303_i2c.c b/drivers/net/phy/lan9303_i2c.c
new file mode 100644
index 0000000000000..d8d0e592ccd8d
--- /dev/null
+++ b/drivers/net/phy/lan9303_i2c.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@xxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/of.h>
+
+#include "lan9303.h"
+
+struct lan9303_i2c {
+ struct i2c_client *device;
+ struct lan9303 chip;
+};
+
+static const struct regmap_config lan9303_i2c_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 32,
+ .reg_stride = 1,
+ .can_multi_write = true,
+ .max_register = 0x0ff, /* address bits 0..1 are not used */
+ .reg_format_endian = REGMAP_ENDIAN_LITTLE,
+
+ .volatile_table = &lan9303_register_set,
+ .wr_table = &lan9303_register_set,
+ .rd_table = &lan9303_register_set,
+
+ .cache_type = REGCACHE_NONE,
+};
+
+static int lan9303_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct lan9303_i2c *sw_dev;
+ int ret;
+
+ sw_dev = devm_kzalloc(&client->dev, sizeof(struct lan9303_i2c),
+ GFP_KERNEL);
+ if (!sw_dev)
+ return -ENOMEM;
+
+ sw_dev->chip.regmap = devm_regmap_init_i2c(client,
+ &lan9303_i2c_regmap_config);
+ if (IS_ERR(sw_dev->chip.regmap)) {
+ ret = PTR_ERR(sw_dev->chip.regmap);
+ dev_err(&client->dev, "Failed to allocate register map: %d\n",
+ ret);
+ return ret;
+ }
+
+ /* link forward and backward */
+ sw_dev->device = client;
+ i2c_set_clientdata(client, sw_dev);
+ sw_dev->chip.dev = &client->dev;
+
+ ret = lan9303_probe(&sw_dev->chip, client->dev.of_node);
+ if (ret != 0)
+ return ret;
+
+ dev_info(&client->dev, "LAN9303 I2C driver loaded successfully\n");
+
+ return 0;
+}
+
+static int lan9303_i2c_remove(struct i2c_client *client)
+{
+ struct lan9303_i2c *sw_dev;
+
+ sw_dev = i2c_get_clientdata(client);
+ if (!sw_dev)
+ return -ENODEV;
+
+ return lan9303_remove(&sw_dev->chip);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static const struct i2c_device_id lan9303_i2c_id[] = {
+ { "lan9303", 0 },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id);
+
+static const struct of_device_id lan9303_i2c_of_match[] = {
+ { .compatible = "smsc,lan9303", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match);
+
+static struct i2c_driver lan9303_i2c_driver = {
+ .driver = {
+ .name = "LAN9303_I2C",
+ .of_match_table = of_match_ptr(lan9303_i2c_of_match),
+ },
+ .probe = lan9303_i2c_probe,
+ .remove = lan9303_i2c_remove,
+ .id_table = lan9303_i2c_id,
+};
+module_i2c_driver(lan9303_i2c_driver);
--
2.11.0