1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/net/dsa/microchip/ksz9477_spi.c b/drivers/net/dsa/microchip/ksz9477_spi.c
new file mode 100644
index 000000000..9bda83d06
--- /dev/null
+++ b/drivers/net/dsa/microchip/ksz9477_spi.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Microchip KSZ9477 series register access through SPI
+ *
+ * Copyright (C) 2017-2019 Microchip Technology Inc.
+ */
+
+#include <asm/unaligned.h>
+
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include "ksz_common.h"
+
+#define SPI_ADDR_SHIFT			24
+#define SPI_ADDR_ALIGN			3
+#define SPI_TURNAROUND_SHIFT		5
+
+KSZ_REGMAP_TABLE(ksz9477, 32, SPI_ADDR_SHIFT,
+		 SPI_TURNAROUND_SHIFT, SPI_ADDR_ALIGN);
+
+static int ksz9477_spi_probe(struct spi_device *spi)
+{
+	struct regmap_config rc;
+	struct ksz_device *dev;
+	int i, ret;
+
+	dev = ksz_switch_alloc(&spi->dev, spi);
+	if (!dev)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(ksz9477_regmap_config); i++) {
+		rc = ksz9477_regmap_config[i];
+		rc.lock_arg = &dev->regmap_mutex;
+		dev->regmap[i] = devm_regmap_init_spi(spi, &rc);
+		if (IS_ERR(dev->regmap[i])) {
+			ret = PTR_ERR(dev->regmap[i]);
+			dev_err(&spi->dev,
+				"Failed to initialize regmap%i: %d\n",
+				ksz9477_regmap_config[i].val_bits, ret);
+			return ret;
+		}
+	}
+
+	if (spi->dev.platform_data)
+		dev->pdata = spi->dev.platform_data;
+
+	ret = ksz9477_switch_register(dev);
+
+	/* Main DSA driver may not be started yet. */
+	if (ret)
+		return ret;
+
+	spi_set_drvdata(spi, dev);
+
+	return 0;
+}
+
+static int ksz9477_spi_remove(struct spi_device *spi)
+{
+	struct ksz_device *dev = spi_get_drvdata(spi);
+
+	if (dev)
+		ksz_switch_remove(dev);
+
+	return 0;
+}
+
+static void ksz9477_spi_shutdown(struct spi_device *spi)
+{
+	struct ksz_device *dev = spi_get_drvdata(spi);
+
+	if (dev && dev->dev_ops->shutdown)
+		dev->dev_ops->shutdown(dev);
+}
+
+static const struct of_device_id ksz9477_dt_ids[] = {
+	{ .compatible = "microchip,ksz9477" },
+	{ .compatible = "microchip,ksz9897" },
+	{ .compatible = "microchip,ksz9893" },
+	{ .compatible = "microchip,ksz9563" },
+	{ .compatible = "microchip,ksz8563" },
+	{ .compatible = "microchip,ksz9567" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
+
+static const struct spi_device_id ksz9477_spi_ids[] = {
+	{ "ksz9477" },
+	{ "ksz9897" },
+	{ "ksz9893" },
+	{ "ksz9563" },
+	{ "ksz8563" },
+	{ "ksz9567" },
+	{ },
+};
+MODULE_DEVICE_TABLE(spi, ksz9477_spi_ids);
+
+static struct spi_driver ksz9477_spi_driver = {
+	.driver = {
+		.name	= "ksz9477-switch",
+		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(ksz9477_dt_ids),
+	},
+	.id_table = ksz9477_spi_ids,
+	.probe	= ksz9477_spi_probe,
+	.remove	= ksz9477_spi_remove,
+	.shutdown = ksz9477_spi_shutdown,
+};
+
+module_spi_driver(ksz9477_spi_driver);
+
+MODULE_ALIAS("spi:ksz9477");
+MODULE_ALIAS("spi:ksz9897");
+MODULE_ALIAS("spi:ksz9893");
+MODULE_ALIAS("spi:ksz9563");
+MODULE_ALIAS("spi:ksz8563");
+MODULE_ALIAS("spi:ksz9567");
+MODULE_AUTHOR("Woojung Huh <Woojung.Huh@microchip.com>");
+MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch SPI access Driver");
+MODULE_LICENSE("GPL");