Commit 84d47735 authored by Guenter Roeck's avatar Guenter Roeck
Browse files

i2c: smbus: Support DDR5 and LPDDR5 SPD EEPROMs 



Detect (LP)DDR5 memory and instantiate the SPD5118 driver automatically.

Suggested-by: default avatarThomas Weißschuh <linux@weissschuh.net>
Cc: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: default avatarArmin Wolf <W_Armin@gmx.de>
Reviewed-by: default avatarThomas Weißschuh <linux@weissschuh.net>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 25dff444

drivers/i2c/i2c-smbus.c

+5 −1
Original line number Diff line number Diff line
@@ -308,7 +308,7 @@ EXPORT_SYMBOL_GPL(i2c_free_slave_host_notify_device); 
 * target systems are the same.

 * Restrictions to automatic SPD instantiation:

 *  - Only works if all filled slots have the same memory type

 *  - Only works for DDR, DDR2, DDR3 and DDR4 for now

 *  - Only works for (LP)DDR memory types up to DDR5

 *  - Only works on systems with 1 to 8 memory slots

 */

#if IS_ENABLED(CONFIG_DMI)
@@ -382,6 +382,10 @@ void i2c_register_spd(struct i2c_adapter *adap) 
	case 0x1E:	/* LPDDR4 */

		name = "ee1004";

		break;

	case 0x22:	/* DDR5 */

	case 0x23:	/* LPDDR5 */

		name = "spd5118";

		break;

	default:

		dev_info(&adap->dev,

			 "Memory type 0x%02x not supported yet, not instantiating SPD\n",