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Date: Wed, 16 Jan 2019 19:24:22 -0800
From: <Tristram.Ha@...rochip.com>
To: Sergio Paracuellos <sergio.paracuellos@...il.com>,
Marek Vasut <marex@...x.de>, Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Pavel Machek <pavel@....cz>,
Dan Carpenter <dan.carpenter@...cle.com>
CC: Tristram Ha <Tristram.Ha@...rochip.com>,
<vivien.didelot@...oirfairelinux.com>,
<UNGLinuxDriver@...rochip.com>, <netdev@...r.kernel.org>
Subject: [PATCH RFC v1] net: dsa: microchip: add KSZ9477 I2C driver
From: Tristram Ha <Tristram.Ha@...rochip.com>
Add KSZ9477 I2C driver support. The code ksz9477.c and ksz_common.c are
used together to generate the I2C driver.
Signed-off-by: Tristram Ha <Tristram.Ha@...rochip.com>
---
drivers/net/dsa/microchip/Kconfig | 7 ++
drivers/net/dsa/microchip/Makefile | 1 +
drivers/net/dsa/microchip/ksz9477_i2c.c | 120 ++++++++++++++++++++++++++++++++
3 files changed, 128 insertions(+)
create mode 100644 drivers/net/dsa/microchip/ksz9477_i2c.c
diff --git a/drivers/net/dsa/microchip/Kconfig b/drivers/net/dsa/microchip/Kconfig
index 385b93f..1798755 100644
--- a/drivers/net/dsa/microchip/Kconfig
+++ b/drivers/net/dsa/microchip/Kconfig
@@ -9,6 +9,13 @@ menuconfig NET_DSA_MICROCHIP_KSZ9477
help
This driver adds support for Microchip KSZ9477 switch chips.
+config NET_DSA_MICROCHIP_KSZ9477_I2C
+ tristate "KSZ9477 series I2C connected switch driver"
+ depends on NET_DSA_MICROCHIP_KSZ9477 && I2C
+ select REGMAP_I2C
+ help
+ Select to enable support for registering switches configured through I2C.
+
config NET_DSA_MICROCHIP_KSZ9477_SPI
tristate "KSZ9477 series SPI connected switch driver"
depends on NET_DSA_MICROCHIP_KSZ9477 && SPI
diff --git a/drivers/net/dsa/microchip/Makefile b/drivers/net/dsa/microchip/Makefile
index 3142c18..dbcc5db 100644
--- a/drivers/net/dsa/microchip/Makefile
+++ b/drivers/net/dsa/microchip/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ_COMMON) += ksz_common.o
obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ9477) += ksz9477.o
+obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ9477_I2C) += ksz9477_i2c.o
obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ9477_SPI) += ksz9477_spi.o
diff --git a/drivers/net/dsa/microchip/ksz9477_i2c.c b/drivers/net/dsa/microchip/ksz9477_i2c.c
new file mode 100644
index 0000000..d8720ff
--- /dev/null
+++ b/drivers/net/dsa/microchip/ksz9477_i2c.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Microchip KSZ9477 series register access through I2C
+ *
+ * Copyright (C) 2018-2019 Microchip Technology Inc.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+
+#include "ksz_priv.h"
+
+#define REG_SIZE 0x8000
+
+#define I2C_REGMAP_VAL 8
+#define I2C_REGMAP_REG 16
+
+#define KSZ_REGMAP_COMMON(n, width) \
+{ \
+ .name = n, \
+ .max_register = REG_SIZE - (width), \
+ .reg_bits = I2C_REGMAP_REG, \
+ .val_bits = I2C_REGMAP_VAL * (width), \
+ .reg_stride = (width), \
+ .reg_format_endian = REGMAP_ENDIAN_BIG, \
+ .val_format_endian = REGMAP_ENDIAN_BIG, \
+}
+
+static const struct regmap_config ksz9477_regmap_cfg[] = {
+ KSZ_REGMAP_COMMON("8", 1),
+ KSZ_REGMAP_COMMON("16", 2),
+ KSZ_REGMAP_COMMON("32", 4),
+};
+
+static int ksz9477_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *i2c_id)
+{
+ struct ksz_device *dev;
+ int i;
+ int ret;
+
+ dev = ksz_switch_alloc(&i2c->dev);
+ if (!dev)
+ return -ENOMEM;
+
+ for (i = 0; i < ARRAY_SIZE(ksz9477_regmap_cfg); i++) {
+ dev->regmap[i] = devm_regmap_init_i2c(i2c,
+ &ksz9477_regmap_cfg[i]);
+ if (IS_ERR(dev->regmap[i])) {
+ ret = PTR_ERR(dev->regmap[i]);
+ dev_err(&i2c->dev, "Failed to initialize regmap: %d\n",
+ ret);
+ return ret;
+ }
+ }
+
+ if (i2c->dev.platform_data)
+ dev->pdata = i2c->dev.platform_data;
+
+ ret = ksz9477_switch_register(dev);
+
+ /* Main DSA driver may not be started yet. */
+ if (ret)
+ return ret;
+
+ i2c_set_clientdata(i2c, dev);
+
+ return 0;
+}
+
+static int ksz9477_i2c_remove(struct i2c_client *i2c)
+{
+ struct ksz_device *dev = i2c_get_clientdata(i2c);
+
+ if (dev)
+ ksz_switch_remove(dev);
+
+ return 0;
+}
+
+static void ksz9477_i2c_shutdown(struct i2c_client *i2c)
+{
+ struct ksz_device *dev = i2c_get_clientdata(i2c);
+
+ if (dev && dev->dev_ops->shutdown)
+ dev->dev_ops->shutdown(dev);
+}
+
+static const struct i2c_device_id ksz9477_i2c_id[] = {
+ { "ksz9477-switch", 0 },
+ {},
+};
+
+MODULE_DEVICE_TABLE(i2c, ksz9477_i2c_id);
+
+static const struct of_device_id ksz9477_dt_ids[] = {
+ { .compatible = "microchip,ksz9477" },
+ { .compatible = "microchip,ksz9897" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
+
+static struct i2c_driver ksz9477_i2c_driver = {
+ .driver = {
+ .name = "ksz9477-switch",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(ksz9477_dt_ids),
+ },
+ .probe = ksz9477_i2c_probe,
+ .remove = ksz9477_i2c_remove,
+ .shutdown = ksz9477_i2c_shutdown,
+ .id_table = ksz9477_i2c_id,
+};
+
+module_i2c_driver(ksz9477_i2c_driver);
+
+MODULE_AUTHOR("Tristram Ha <Tristram.Ha@...rochip.com>");
+MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch I2C Driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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