Merge tag 'hisi-drivers-for-6.13' of https://github.com/hisilicon/linux-hisi into arm/drivers

HiSilicon driver updates for v6.13

- Add the sysfs to show all HCCS types used on the platform
- Add the low power feature for HCCS by adjusting the lane number
- Few cleanups and improvements: correct a PCC typo, verify the die, port
information, base address and size, update the lane_mode to max_lane_num

* tag 'hisi-drivers-for-6.13' of https://github.com/hisilicon/linux-hisi:
  soc: hisilicon: kunpeng_hccs: Support low power feature for the specified HCCS type
  soc: hisilicon: kunpeng_hccs: Add used HCCS types sysfs
  soc: hisilicon: kunpeng_hccs: Fix the 'lane_mode' field name in port info structure to 'max_lane_num'
  soc: hisilicon: kunpeng_hccs: Add the check for base address and size of shared memory
  soc: hisilicon: kunpeng_hccs: Return failure on having not die or port information
  soc: hisilicon: kunpeng_hccs: Fix a PCC typo

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnd Bergmann <[email protected]>

Author: arndb

Documentation/ABI/testing/sysfs-devices-platform-kunpeng_hccs

@@ -79,3 +79,48 @@ Description:
 			           indicates a lane.
 		crc_err_cnt:  (RO) CRC err count on this port.
 		============= ==== =============================================
+
+What:		/sys/devices/platform/HISI04Bx:00/used_types
+Date:		August 2024
+KernelVersion:	6.12
+Contact:	Huisong Li <[email protected]>
+Description:
+		This interface is used to show all HCCS types used on the
+		platform, like, HCCS-v1, HCCS-v2 and so on.
+
+What:		/sys/devices/platform/HISI04Bx:00/available_inc_dec_lane_types
+What:		/sys/devices/platform/HISI04Bx:00/dec_lane_of_type
+What:		/sys/devices/platform/HISI04Bx:00/inc_lane_of_type
+Date:		August 2024
+KernelVersion:	6.12
+Contact:	Huisong Li <[email protected]>
+Description:
+		These interfaces under /sys/devices/platform/HISI04Bx/ are
+		used to support the low power consumption feature of some
+		HCCS types by changing the number of lanes used. The interfaces
+		changing the number of lanes used are 'dec_lane_of_type' and
+		'inc_lane_of_type' which require root privileges. These
+		interfaces aren't exposed if no HCCS type on platform support
+		this feature. Please note that decreasing lane number is only
+		allowed if all the specified HCCS ports are not busy.
+
+		The low power consumption interfaces are as follows:
+
+		============================= ==== ================================
+		available_inc_dec_lane_types: (RO) available HCCS types (string) to
+						   increase and decrease the number
+						   of lane used, e.g. HCCS-v2.
+		dec_lane_of_type:             (WO) input HCCS type supported
+						   decreasing lane to decrease the
+						   used lane number of all specified
+						   HCCS type ports on platform to
+						   the minimum.
+						   You can query the 'cur_lane_num'
+						   to get the minimum lane number
+						   after executing successfully.
+		inc_lane_of_type:             (WO) input HCCS type supported
+						   increasing lane to increase the
+						   used lane number of all specified
+						   HCCS type ports on platform to
+						   the full lane state.
+		============================= ==== ================================

drivers/soc/hisilicon/Kconfig

@@ -13,9 +13,12 @@ config KUNPENG_HCCS
 	  interconnection bus protocol.
 	  The performance of application may be affected if some HCCS
 	  ports are not in full lane status, have a large number of CRC
-	  errors and so on.
+	  errors and so on. This may support for reducing system power
+	  consumption if there are HCCS ports supported low power feature
+	  on platform.
 
 	  Say M here if you want to include support for querying the
-	  health status and port information of HCCS on Kunpeng SoC.
+	  health status and port information of HCCS, or reducing system
+	  power consumption on Kunpeng SoC.
 
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