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i2c: smbus: Support DDR5 and LPDDR5 SPD EEPROMs

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

Suggested-by: Thomas Weißschuh <linux@weissschuh.net>
Cc: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Armin Wolf <W_Armin@gmx.de>
Reviewed-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2024-06-01 06:44:47 -07:00
parent 25dff444c6
commit 84d477354b
1 changed files with 5 additions and 1 deletions
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6
drivers/i2c/i2c-smbus.c
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@ -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",