misc: eeprom_93xx46: Add new 93c56 and 93c66 compatible strings

These two devices have respectively 2048 and 4096 bits of storage,
compared to 1024 for the 93c46.

Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Link: https://lore.kernel.org/r/20210511210727.24895-3-linkmauve@linkmauve.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/eeprom/eeprom_93xx46.c

@@ -29,14 +29,29 @@
 
 struct eeprom_93xx46_devtype_data {
 	unsigned int quirks;
+	unsigned char flags;
+};
+
+static const struct eeprom_93xx46_devtype_data at93c46_data = {
+	.flags = EE_SIZE1K,
+};
+
+static const struct eeprom_93xx46_devtype_data at93c56_data = {
+	.flags = EE_SIZE2K,
+};
+
+static const struct eeprom_93xx46_devtype_data at93c66_data = {
+	.flags = EE_SIZE4K,
 };
 
 static const struct eeprom_93xx46_devtype_data atmel_at93c46d_data = {
+	.flags = EE_SIZE1K,
 	.quirks = EEPROM_93XX46_QUIRK_SINGLE_WORD_READ |
 		  EEPROM_93XX46_QUIRK_INSTRUCTION_LENGTH,
 };
 
 static const struct eeprom_93xx46_devtype_data microchip_93lc46b_data = {
+	.flags = EE_SIZE1K,
 	.quirks = EEPROM_93XX46_QUIRK_EXTRA_READ_CYCLE,
 };
 
@@ -381,8 +396,11 @@ static void select_deassert(void *context)
 }
 
 static const struct of_device_id eeprom_93xx46_of_table[] = {
-	{ .compatible = "eeprom-93xx46", },
+	{ .compatible = "eeprom-93xx46", .data = &at93c46_data, },
+	{ .compatible = "atmel,at93c46", .data = &at93c46_data, },
 	{ .compatible = "atmel,at93c46d", .data = &atmel_at93c46d_data, },
+	{ .compatible = "atmel,at93c56", .data = &at93c56_data, },
+	{ .compatible = "atmel,at93c66", .data = &at93c66_data, },
 	{ .compatible = "microchip,93lc46b", .data = &microchip_93lc46b_data, },
 	{}
 };
@@ -432,6 +450,7 @@ static int eeprom_93xx46_probe_dt(struct spi_device *spi)
 		const struct eeprom_93xx46_devtype_data *data = of_id->data;
 
 		pd->quirks = data->quirks;
+		pd->flags |= data->flags;
 	}
 
 	spi->dev.platform_data = pd;
@@ -461,7 +480,16 @@ static int eeprom_93xx46_probe(struct spi_device *spi)
 	if (!edev)
 		return -ENOMEM;
 
-	edev->size = 128;
+	if (pd->flags & EE_SIZE1K)
+		edev->size = 128;
+	else if (pd->flags & EE_SIZE2K)
+		edev->size = 256;
+	else if (pd->flags & EE_SIZE4K)
+		edev->size = 512;
+	else {
+		dev_err(&spi->dev, "unspecified size\n");
+		return -EINVAL;
+	}
 
 	if (pd->flags & EE_ADDR8)
 		edev->addrlen = ilog2(edev->size);
@@ -496,8 +524,9 @@ static int eeprom_93xx46_probe(struct spi_device *spi)
 	if (IS_ERR(edev->nvmem))
 		return PTR_ERR(edev->nvmem);
 
-	dev_info(&spi->dev, "%d-bit eeprom %s\n",
+	dev_info(&spi->dev, "%d-bit eeprom containing %d bytes %s\n",
 		(pd->flags & EE_ADDR8) ? 8 : 16,
+		edev->size,
 		(pd->flags & EE_READONLY) ? "(readonly)" : "");
 
 	if (!(pd->flags & EE_READONLY)) {

include/linux/eeprom_93xx46.h

@@ -10,6 +10,9 @@ struct eeprom_93xx46_platform_data {
 #define EE_ADDR8	0x01		/*  8 bit addr. cfg */
 #define EE_ADDR16	0x02		/* 16 bit addr. cfg */
 #define EE_READONLY	0x08		/* forbid writing */
+#define EE_SIZE1K	0x10		/* 1 kb of data, that is a 93xx46 */
+#define EE_SIZE2K	0x20		/* 2 kb of data, that is a 93xx56 */
+#define EE_SIZE4K	0x40		/* 4 kb of data, that is a 93xx66 */
 
 	unsigned int	quirks;
 /* Single word read transfers only; no sequential read. */