1 files changed, 115 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-mcp23s08_i2c.c b/drivers/pinctrl/pinctrl-mcp23s08_i2c.c
new file mode 100644
index 000000000000..94e1add6ddd7
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-mcp23s08_i2c.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* MCP23S08 I2C GPIO driver */
+
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "pinctrl-mcp23s08.h"
+
+static int mcp230xx_probe(struct i2c_client *client)
+{
+	const struct mcp23s08_info *info;
+	struct device *dev = &client->dev;
+	struct mcp23s08 *mcp;
+	int ret;
+
+	mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL);
+	if (!mcp)
+		return -ENOMEM;
+
+	info = i2c_get_match_data(client);
+	if (!info)
+		return dev_err_probe(dev, -EINVAL, "invalid device type\n");
+
+	mcp->reg_shift = info->reg_shift;
+	mcp->chip.ngpio = info->ngpio;
+	mcp->chip.label = info->label;
+	mcp->regmap = devm_regmap_init_i2c(client, info->regmap);
+	if (IS_ERR(mcp->regmap))
+		return PTR_ERR(mcp->regmap);
+
+	mcp->irq = client->irq;
+	mcp->pinctrl_desc.name = "mcp23xxx-pinctrl";
+
+	ret = mcp23s08_probe_one(mcp, dev, client->addr, info->type, -1);
+	if (ret)
+		return ret;
+
+	i2c_set_clientdata(client, mcp);
+
+	return 0;
+}
+
+static const struct mcp23s08_info mcp23008_i2c = {
+	.regmap = &mcp23x08_regmap,
+	.label = "mcp23008",
+	.type = MCP_TYPE_008,
+	.ngpio = 8,
+	.reg_shift = 0,
+};
+
+static const struct mcp23s08_info mcp23017_i2c = {
+	.regmap = &mcp23x17_regmap,
+	.label = "mcp23017",
+	.type = MCP_TYPE_017,
+	.ngpio = 16,
+	.reg_shift = 1,
+};
+
+static const struct mcp23s08_info  mcp23018_i2c = {
+	.regmap = &mcp23x17_regmap,
+	.label = "mcp23018",
+	.type = MCP_TYPE_018,
+	.ngpio = 16,
+	.reg_shift = 1,
+};
+
+static const struct i2c_device_id mcp230xx_id[] = {
+	{ "mcp23008", (kernel_ulong_t)&mcp23008_i2c },
+	{ "mcp23017", (kernel_ulong_t)&mcp23017_i2c },
+	{ "mcp23018", (kernel_ulong_t)&mcp23018_i2c },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
+
+static const struct of_device_id mcp23s08_i2c_of_match[] = {
+	{ .compatible = "microchip,mcp23008", .data = &mcp23008_i2c },
+	{ .compatible = "microchip,mcp23017", .data = &mcp23017_i2c },
+	{ .compatible = "microchip,mcp23018", .data = &mcp23018_i2c },
+/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
+	{ .compatible = "mcp,mcp23008", .data = &mcp23008_i2c },
+	{ .compatible = "mcp,mcp23017", .data = &mcp23017_i2c },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
+
+static struct i2c_driver mcp230xx_driver = {
+	.driver = {
+		.name	= "mcp230xx",
+		.of_match_table = mcp23s08_i2c_of_match,
+	},
+	.probe		= mcp230xx_probe,
+	.id_table	= mcp230xx_id,
+};
+
+static int __init mcp23s08_i2c_init(void)
+{
+	return i2c_add_driver(&mcp230xx_driver);
+}
+
+/*
+ * Register after I²C postcore initcall and before
+ * subsys initcalls that may rely on these GPIOs.
+ */
+subsys_initcall(mcp23s08_i2c_init);
+
+static void mcp23s08_i2c_exit(void)
+{
+	i2c_del_driver(&mcp230xx_driver);
+}
+module_exit(mcp23s08_i2c_exit);
+
+MODULE_DESCRIPTION("MCP23S08 I2C GPIO driver");
+MODULE_LICENSE("GPL");