[PATCH] hwmon: (socfpga) add Agilex 5 channel mapping

[tze.yee.ng@altera.com]

From: Tze Yee Ng <tze.yee.ng@altera.com>

Add temperature channel mapping for Agilex 5 and bind it to the
"intel,agilex5-svc" compatible string. Reuse the Agilex voltage channels.
Agilex 5 omits temperature channel 2 (top-left corner) because that
sensor is not present; remaining sensors keep Agilex channel numbers.

Match intel,agilex5-svc before intel,agilex-svc so dual-compatible DT
nodes select the Agilex 5 board data.

Update the socfpga-hwmon documentation to list Agilex 5, the matching
compatible string, and the SDM temperature/voltage channel tables.

Signed-off-by: Tze Yee Ng <tze.yee.ng@altera.com>
---
 Documentation/hwmon/socfpga-hwmon.rst | 52 +++++++++++++++++++++++++++
 drivers/hwmon/socfpga-hwmon.c         | 27 ++++++++++++++
 2 files changed, 79 insertions(+)

diff --git a/Documentation/hwmon/socfpga-hwmon.rst b/Documentation/hwmon/socfpga-hwmon.rst
index e5da42556a62..664103a38195 100644
--- a/Documentation/hwmon/socfpga-hwmon.rst
+++ b/Documentation/hwmon/socfpga-hwmon.rst
@@ -7,6 +7,7 @@ Supported chips:
 
  * Altera Stratix 10 SoC FPGA
  * Altera Agilex SoC FPGA
+ * Altera Agilex 5 SoC FPGA
 
 Authors:
       - Nazim Amirul <muhammad.nazim.amirul.nazle.asmade@altera.com>
@@ -32,3 +33,54 @@ driver based on the service layer compatible string:
 
   * intel,stratix10-svc
   * intel,agilex-svc
+  * intel,agilex5-svc
+
+Channel mappings are fixed in the driver (not described in DT). The tables
+below list the SDM page/channel encodings used for each family.
+
+Temperature channels
+~~~~~~~~~~~~~~~~~~~~
+
+==========  ====  =======  =================================
+Family      Page  Channel  Label
+==========  ====  =======  =================================
+Stratix 10  0     0        Main Die SDM
+Agilex      0     0        Main Die SDM
+Agilex      1     0        Main Die corner bottom left max
+Agilex      2     0        Main Die corner top left max
+Agilex      3     0        Main Die corner bottom right max
+Agilex      4     0        Main Die corner top right max
+Agilex 5    0     0        Main Die SDM
+Agilex 5    1     0        Main Die corner bottom left max
+Agilex 5    3     0        Main Die corner bottom right max
+Agilex 5    4     0        Main Die corner top right max
+==========  ====  =======  =================================
+
+Agilex 5 omits SDM temperature channel 2 (top-left corner on Agilex)
+because that sensor is not present in hardware. The remaining sensors keep
+the same channel numbers as Agilex.
+
+Voltage channels
+~~~~~~~~~~~~~~~~
+
+==========  ====  =======  =================
+Family      Page  Channel  Label
+==========  ====  =======  =================
+Stratix 10  0     2        0.8V VCC
+Stratix 10  0     3        1.8V VCCIO_SDM
+Stratix 10  0     6        0.9V VCCERAM
+Agilex      0     2        0.8V VCC
+Agilex      0     3        1.8V VCCIO_SDM
+Agilex      0     4        1.8V VCCPT
+Agilex      0     5        1.2V VCCCRCORE
+Agilex      0     6        0.9V VCCH
+Agilex      0     7        0.8V VCCL
+Agilex 5    0     2        0.8V VCC
+Agilex 5    0     3        1.8V VCCIO_SDM
+Agilex 5    0     4        1.8V VCCPT
+Agilex 5    0     5        1.2V VCCCRCORE
+Agilex 5    0     6        0.9V VCCH
+Agilex 5    0     7        0.8V VCCL
+==========  ====  =======  =================
+
+Agilex 5 reuses the Agilex voltage SDM page/channel layout and labels.
diff --git a/drivers/hwmon/socfpga-hwmon.c b/drivers/hwmon/socfpga-hwmon.c
index 5b43274d0aa2..92bffc02e309 100644
--- a/drivers/hwmon/socfpga-hwmon.c
+++ b/drivers/hwmon/socfpga-hwmon.c
@@ -433,6 +433,30 @@ static const struct socfpga_hwmon_board_data agilex_hwmon_board = {
 	.num_volt = ARRAY_SIZE(agilex_hwmon_volt_channels),
 };
 
+/*
+ * Agilex 5 exposes the SDM and three corner temperature sensors. Channel 2
+ * (top-left corner on Agilex) is not present in hardware, so the SDM channel
+ * numbering keeps the gap (0, 1, 3, 4) rather than renumbering.
+ */
+static const struct socfpga_hwmon_channel agilex5_hwmon_temp_channels[] = {
+	{ SOCFPGA_HWMON_CHAN(0, 0), "Main Die SDM" },
+	{ SOCFPGA_HWMON_CHAN(1, 0), "Main Die corner bottom left max" },
+	{ SOCFPGA_HWMON_CHAN(3, 0), "Main Die corner bottom right max" },
+	{ SOCFPGA_HWMON_CHAN(4, 0), "Main Die corner top right max" },
+};
+
+/*
+ * Agilex 5 reuses the Agilex voltage SDM page/channel encoding and labels.
+ * Check more specific "intel,agilex5-svc" before "intel,agilex-svc" below so a
+ * node that lists both compatibles selects this board data.
+ */
+static const struct socfpga_hwmon_board_data agilex5_hwmon_board = {
+	.temp = agilex5_hwmon_temp_channels,
+	.num_temp = ARRAY_SIZE(agilex5_hwmon_temp_channels),
+	.volt = agilex_hwmon_volt_channels,
+	.num_volt = ARRAY_SIZE(agilex_hwmon_volt_channels),
+};
+
 static const struct socfpga_hwmon_board_data *
 socfpga_hwmon_get_board(struct device *dev)
 {
@@ -443,6 +467,9 @@ socfpga_hwmon_get_board(struct device *dev)
 
 	if (of_device_is_compatible(np, "intel,stratix10-svc"))
 		return &s10_hwmon_board;
+	/* Prefer the more specific Agilex 5 compatible over generic Agilex. */
+	if (of_device_is_compatible(np, "intel,agilex5-svc"))
+		return &agilex5_hwmon_board;
 	if (of_device_is_compatible(np, "intel,agilex-svc"))
 		return &agilex_hwmon_board;
 
-- 
2.43.7