Merge branch 'net-dsa-microchip-add-ksz8463-switch-support'ipvs-next/mainipvs-next/HEAD

Tristram Ha says:

====================
net: dsa: microchip: Add KSZ8463 switch support

This series of patches is to add KSZ8463 switch support to the KSZ DSA
driver.
====================

Link: https://patch.msgid.link/20250725001753.6330-1-Tristram.Ha@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 104 insertions, 0 deletions

diff --git a/drivers/net/dsa/microchip/ksz_spi.c b/drivers/net/dsa/microchip/ksz_spi.c
index b633d263098c..d8001734b057 100644
--- a/drivers/net/dsa/microchip/ksz_spi.c
+++ b/drivers/net/dsa/microchip/ksz_spi.c
@@ -16,6 +16,10 @@
 
 #include "ksz_common.h"
 
+#define KSZ8463_SPI_ADDR_SHIFT			13
+#define KSZ8463_SPI_ADDR_ALIGN			3
+#define KSZ8463_SPI_TURNAROUND_SHIFT		2
+
 #define KSZ8795_SPI_ADDR_SHIFT			12
 #define KSZ8795_SPI_ADDR_ALIGN			3
 #define KSZ8795_SPI_TURNAROUND_SHIFT		1
@@ -37,6 +41,99 @@ KSZ_REGMAP_TABLE(ksz8863, 16, KSZ8863_SPI_ADDR_SHIFT,
 KSZ_REGMAP_TABLE(ksz9477, 32, KSZ9477_SPI_ADDR_SHIFT,
 		 KSZ9477_SPI_TURNAROUND_SHIFT, KSZ9477_SPI_ADDR_ALIGN);
 
+static u16 ksz8463_reg(u16 reg, size_t size)
+{
+	switch (size) {
+	case 1:
+		reg = ((reg >> 2) << 4) | (1 << (reg & 3));
+		break;
+	case 2:
+		reg = ((reg >> 2) << 4) | (reg & 2 ? 0x0c : 0x03);
+		break;
+	default:
+		reg = ((reg >> 2) << 4) | 0xf;
+		break;
+	}
+	reg <<= KSZ8463_SPI_TURNAROUND_SHIFT;
+	return reg;
+}
+
+static int ksz8463_spi_read(void *context,
+			    const void *reg, size_t reg_size,
+			    void *val, size_t val_size)
+{
+	struct device *dev = context;
+	struct spi_device *spi = to_spi_device(dev);
+	u8 bytes[2];
+	u16 cmd;
+	int rc;
+
+	if (reg_size > 2 || val_size > 4)
+		return -EINVAL;
+	memcpy(&cmd, reg, sizeof(u16));
+	cmd = ksz8463_reg(cmd, val_size);
+	/* SPI command uses big-endian format. */
+	put_unaligned_be16(cmd, bytes);
+	rc = spi_write_then_read(spi, bytes, reg_size, val, val_size);
+#if defined(__BIG_ENDIAN)
+	/* Register value uses little-endian format so need to convert when
+	 * running in big-endian system.
+	 */
+	if (!rc && val_size > 1) {
+		if (val_size == 2) {
+			u16 v = get_unaligned_le16(val);
+
+			memcpy(val, &v, sizeof(v));
+		} else if (val_size == 4) {
+			u32 v = get_unaligned_le32(val);
+
+			memcpy(val, &v, sizeof(v));
+		}
+	}
+#endif
+	return rc;
+}
+
+static int ksz8463_spi_write(void *context, const void *data, size_t count)
+{
+	struct device *dev = context;
+	struct spi_device *spi = to_spi_device(dev);
+	size_t val_size = count - 2;
+	u8 bytes[6];
+	u16 cmd;
+
+	if (count <= 2 || count > 6)
+		return -EINVAL;
+	memcpy(bytes, data, count);
+	memcpy(&cmd, data, sizeof(u16));
+	cmd = ksz8463_reg(cmd, val_size);
+	cmd |= (1 << (KSZ8463_SPI_ADDR_SHIFT + KSZ8463_SPI_TURNAROUND_SHIFT));
+	/* SPI command uses big-endian format. */
+	put_unaligned_be16(cmd, bytes);
+#if defined(__BIG_ENDIAN)
+	/* Register value uses little-endian format so need to convert when
+	 * running in big-endian system.
+	 */
+	if (val_size == 2) {
+		u8 *val = &bytes[2];
+		u16 v;
+
+		memcpy(&v, val, sizeof(v));
+		put_unaligned_le16(v, val);
+	} else if (val_size == 4) {
+		u8 *val = &bytes[2];
+		u32 v;
+
+		memcpy(&v, val, sizeof(v));
+		put_unaligned_le32(v, val);
+	}
+#endif
+	return spi_write(spi, bytes, count);
+}
+
+KSZ8463_REGMAP_TABLE(ksz8463, KSZ8463_SPI_ADDR_SHIFT, 0,
+		     KSZ8463_SPI_ADDR_ALIGN);
+
 static int ksz_spi_probe(struct spi_device *spi)
 {
 	const struct regmap_config *regmap_config;
@@ -58,6 +155,8 @@ static int ksz_spi_probe(struct spi_device *spi)
 	dev->chip_id = chip->chip_id;
 	if (chip->chip_id == KSZ88X3_CHIP_ID)
 		regmap_config = ksz8863_regmap_config;
+	else if (chip->chip_id == KSZ8463_CHIP_ID)
+		regmap_config = ksz8463_regmap_config;
 	else if (chip->chip_id == KSZ8795_CHIP_ID ||
 		 chip->chip_id == KSZ8794_CHIP_ID ||
 		 chip->chip_id == KSZ8765_CHIP_ID)
@@ -126,6 +225,10 @@ static void ksz_spi_shutdown(struct spi_device *spi)
 
 static const struct of_device_id ksz_dt_ids[] = {
 	{
+		.compatible = "microchip,ksz8463",
+		.data = &ksz_switch_chips[KSZ8463]
+	},
+	{
 		.compatible = "microchip,ksz8765",
 		.data = &ksz_switch_chips[KSZ8765]
 	},
@@ -214,6 +317,7 @@ static const struct of_device_id ksz_dt_ids[] = {
 MODULE_DEVICE_TABLE(of, ksz_dt_ids);
 
 static const struct spi_device_id ksz_spi_ids[] = {
+	{ "ksz8463" },
 	{ "ksz8765" },
 	{ "ksz8794" },
 	{ "ksz8795" },