linux-gbmc: 5.15: Add TPS53679 linear mode, TPS53685, and TPS53686

Split TPS53679 enhancements into two patches:
1. Dynamic linear mode detection in tps53679_identify_mode() based on
   VOUT_MODE register (PB_VOUT_MODE_LINEAR).
2. Global support for TPS53685 and TPS53686 controllers:
   - Enable PMBUS_HAVE_TEMP2 (temp3) on page 0 for controller die temperature.
   - Enable dual-page VIN/IIN/PIN/STATUS_INPUT telemetry on page 1.
   - Add chip ID and device tree compatible entries for TPS53685 and TPS53686.

Google-Bug-Id: 467801199
Signed-off-by: William A. Kennington III <wak@google.com>
Tested: Built image and verified TPS53686 telemetry live on hardware.
Change-Id: Ia89544b7330efeb5a84eba66603fba6dc6f5b64f

recipes-kernel/linux/5.15/0001-hwmon-pmbus-tps53679-Add-linear-mode-support.patch

diff --git a/recipes-kernel/linux/5.15/0001-hwmon-pmbus-tps53679-Add-linear-mode-support.patch b/recipes-kernel/linux/5.15/0001-hwmon-pmbus-tps53679-Add-linear-mode-support.patch
new file mode 100644
index 0000000..aaec900
--- /dev/null
+++ b/recipes-kernel/linux/5.15/0001-hwmon-pmbus-tps53679-Add-linear-mode-support.patch
@@ -0,0 +1,24 @@
+From: William A. Kennington III <wak@google.com>
+Subject: [PATCH] hwmon: (pmbus/tps53679) Add linear mode support
+
+Support linear output voltage format dynamically in
+tps53679_identify_mode() based on the VOUT_MODE register
+(PB_VOUT_MODE_LINEAR).
+
+Upstream-Status: Pending
+Signed-off-by: William A. Kennington III <wak@google.com>
+---
+--- a/drivers/hwmon/pmbus/tps53679.c
++++ b/drivers/hwmon/pmbus/tps53679.c
+@@ -50,6 +50,11 @@
+ 		ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
+ 		if (ret < 0)
+ 			return ret;
++
++		if ((ret & PB_VOUT_MODE_MODE_MASK) == PB_VOUT_MODE_LINEAR) {
++			info->format[PSC_VOLTAGE_OUT] = linear;
++			continue;
++		}
+ 
+ 		vout_params = ret & GENMASK(4, 0);
+ 

recipes-kernel/linux/5.15/0002-hwmon-pmbus-tps53679-Add-TPS53685-and-TPS53686-support.patch

diff --git a/recipes-kernel/linux/5.15/0002-hwmon-pmbus-tps53679-Add-TPS53685-and-TPS53686-support.patch b/recipes-kernel/linux/5.15/0002-hwmon-pmbus-tps53679-Add-TPS53685-and-TPS53686-support.patch
new file mode 100644
index 0000000..ce0cad8
--- /dev/null
+++ b/recipes-kernel/linux/5.15/0002-hwmon-pmbus-tps53679-Add-TPS53685-and-TPS53686-support.patch
@@ -0,0 +1,58 @@
+From: William A. Kennington III <wak@google.com>
+Subject: [PATCH] hwmon: (pmbus/tps53679) Add TPS53685 and TPS53686 support
+
+Add support for Texas Instruments TPS53685 and TPS53686 dual-channel
+step-down controllers with per-channel input telemetry (VIN, IIN, PIN)
+and controller die temperature (temp3).
+
+Upstream-Status: Pending
+Signed-off-by: William A. Kennington III <wak@google.com>
+---
+--- a/drivers/hwmon/pmbus/tps53679.c
++++ b/drivers/hwmon/pmbus/tps53679.c
+@@ -16,7 +16,7 @@
+ #include "pmbus.h"
+ 
+ enum chips {
+-	tps53647, tps53667, tps53676, tps53679, tps53681, tps53688
++	tps53647, tps53667, tps53676, tps53679, tps53681, tps53685, tps53686, tps53688
+ };
+ 
+ #define TPS53647_PAGE_NUM		1
+@@ -140,6 +140,9 @@
+ static int tps53679_identify(struct i2c_client *client,
+ 			     struct pmbus_driver_info *info)
+ {
++	info->func[0] |= PMBUS_HAVE_TEMP2;
++	info->func[1] |= PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
++			 PMBUS_HAVE_STATUS_INPUT;
+ 	return tps53679_identify_mode(client, info);
+ }
+ 
+@@ -258,6 +261,8 @@
+ 		info->identify = tps53676_identify;
+ 		break;
+ 	case tps53679:
++	case tps53685:
++	case tps53686:
+ 	case tps53688:
+ 		info->pages = TPS53679_PAGE_NUM;
+ 		info->identify = tps53679_identify;
+@@ -282,6 +287,8 @@
+ 	{"tps53676", tps53676},
+ 	{"tps53679", tps53679},
+ 	{"tps53681", tps53681},
++	{"tps53685", tps53685},
++	{"tps53686", tps53686},
+ 	{"tps53688", tps53688},
+ 	{}
+ };
+@@ -294,6 +301,8 @@
+ 	{.compatible = "ti,tps53676", .data = (void *)tps53676},
+ 	{.compatible = "ti,tps53679", .data = (void *)tps53679},
+ 	{.compatible = "ti,tps53681", .data = (void *)tps53681},
++	{.compatible = "ti,tps53685", .data = (void *)tps53685},
++	{.compatible = "ti,tps53686", .data = (void *)tps53686},
+ 	{.compatible = "ti,tps53688", .data = (void *)tps53688},
+ 	{}
+ };

recipes-kernel/linux/linux-gbmc_5.15.bb

diff --git a/recipes-kernel/linux/linux-gbmc_5.15.bb b/recipes-kernel/linux/linux-gbmc_5.15.bb
index 53b307a..573499d 100644
--- a/recipes-kernel/linux/linux-gbmc_5.15.bb
+++ b/recipes-kernel/linux/linux-gbmc_5.15.bb
@@ -34,6 +34,8 @@
   file://0001-add-tda38740-driver.patch \
   file://0001-add-xdp730-driver.patch \
   file://0001-Add-STEF48H28-driver.patch \
+  file://0001-hwmon-pmbus-tps53679-Add-linear-mode-support.patch \
+  file://0002-hwmon-pmbus-tps53679-Add-TPS53685-and-TPS53686-support.patch \
   "
 
 SRC_URI:append:aspeed-g6 = " \