linux-kernel - [PATCH 2/3] hwmon: (peci/dimmtemp) add Intel Emerald Rapids platform support

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Message-ID: <20251006215321.5036-3-fr0st61te@gmail.com>
Date: Tue,  7 Oct 2025 00:53:20 +0300
From: Ivan Mikhaylov <fr0st61te@...il.com>
To: Iwona Winiarska <iwona.winiarska@...el.com>,
	Guenter Roeck <linux@...ck-us.net>
Cc: linux-hwmon@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	openbmc@...ts.ozlabs.org,
	Ivan Mikhaylov <fr0st61te@...il.com>
Subject: [PATCH 2/3] hwmon: (peci/dimmtemp) add Intel Emerald Rapids platform support

Extend the functionality of hwmon (peci/dimmtemp) for Emerald Rapids
platform.

The patch has been tested on a 5S system with 16 DIMMs installed.
Verified read of DIMM temperature thresholds & temperature.

Using Sapphire's callbacks about getting thresholds because it's same
platform/socket.

Signed-off-by: Ivan Mikhaylov <fr0st61te@...il.com>
---
 drivers/hwmon/peci/dimmtemp.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/hwmon/peci/dimmtemp.c b/drivers/hwmon/peci/dimmtemp.c
index fbe82d9852e0..a281476c7a31 100644
--- a/drivers/hwmon/peci/dimmtemp.c
+++ b/drivers/hwmon/peci/dimmtemp.c
@@ -32,6 +32,8 @@
 #define DIMM_IDX_MAX_ON_ICXD	2
 #define CHAN_RANK_MAX_ON_SPR	8
 #define DIMM_IDX_MAX_ON_SPR	2
+#define CHAN_RANK_MAX_ON_EMR	8
+#define DIMM_IDX_MAX_ON_EMR	2
 
 #define CHAN_RANK_MAX		CHAN_RANK_MAX_ON_HSX
 #define DIMM_IDX_MAX		DIMM_IDX_MAX_ON_HSX
@@ -571,6 +573,12 @@ read_thresholds_spr(struct peci_dimmtemp *priv, int dimm_order, int chan_rank, u
 	return 0;
 }
 
+static int read_thresholds_emr(struct peci_dimmtemp *priv, int dimm_order,
+			       int chan_rank, u32 *data)
+{
+	return read_thresholds_spr(priv, dimm_order, chan_rank, data);
+}
+
 static const struct dimm_info dimm_hsx = {
 	.chan_rank_max	= CHAN_RANK_MAX_ON_HSX,
 	.dimm_idx_max	= DIMM_IDX_MAX_ON_HSX,
@@ -620,6 +628,13 @@ static const struct dimm_info dimm_spr = {
 	.read_thresholds = &read_thresholds_spr,
 };
 
+static const struct dimm_info dimm_emr = {
+	.chan_rank_max  = CHAN_RANK_MAX_ON_EMR,
+	.dimm_idx_max  = DIMM_IDX_MAX_ON_EMR,
+	.min_peci_revision = 0x40,
+	.read_thresholds = &read_thresholds_emr,
+};
+
 static const struct auxiliary_device_id peci_dimmtemp_ids[] = {
 	{
 		.name = "peci_cpu.dimmtemp.hsx",
@@ -649,6 +664,10 @@ static const struct auxiliary_device_id peci_dimmtemp_ids[] = {
 		.name = "peci_cpu.dimmtemp.spr",
 		.driver_data = (kernel_ulong_t)&dimm_spr,
 	},
+	{
+		.name = "peci_cpu.dimmtemp.emr",
+		.driver_data = (kernel_ulong_t)&dimm_emr,
+	},
 	{ }
 };
 MODULE_DEVICE_TABLE(auxiliary, peci_dimmtemp_ids);
-- 
2.49.0