linux-kernel - [PATCH v5 5/6] i2c: smbus: Support DDR5 and LPDDR5 SPD EEPROMs

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Message-Id: <20240610144103.1970359-6-linux@roeck-us.net>
Date: Mon, 10 Jun 2024 07:41:02 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: linux-hwmon@...r.kernel.org
Cc: linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	René Rebe <rene@...ctcode.de>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	Armin Wolf <W_Armin@....de>,
	Stephen Horvath <s.horvath@...look.com.au>,
	Paul Menzel <pmenzel@...gen.mpg.de>,
	Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH v5 5/6] i2c: smbus: Support DDR5 and LPDDR5 SPD EEPROMs

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

Suggested-by: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>
Acked-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Reviewed-by: Armin Wolf <W_Armin@....de>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
v5: Added reference to LPDDR5 to subject and description
    Updated comments associated with i2c_register_spd()
    to include support for (LP)DDR5

v4: New patch

 drivers/i2c/i2c-smbus.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-smbus.c b/drivers/i2c/i2c-smbus.c
index 97f338b123b1..f809f0ef2004 100644
--- a/drivers/i2c/i2c-smbus.c
+++ b/drivers/i2c/i2c-smbus.c
@@ -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",
-- 
2.39.2