Merge branch 'cznic/platform' of https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc into soc/drivers

These are updates from Marek Behún for the cznic platform drivers:

  This series adds support for generating ECDSA signatures with hardware
  stored private key on Turris Omnia and Turris MOX.
  This ability is exposed via the keyctl() syscall.

* 'cznic/platform' of https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc:
  platform: cznic: use ffs() instead of __bf_shf()
  firmware: turris-mox-rwtm: fix building without CONFIG_KEYS
  platform: cznic: fix function parameter names
  firmware: turris-mox-rwtm: Add support for ECDSA signatures with HW private key
  firmware: turris-mox-rwtm: Drop ECDSA signatures via debugfs
  platform: cznic: turris-omnia-mcu: Add support for digital message signing with HW private key
  platform: cznic: Add keyctl helpers for Turris platform
  platform: cznic: turris-omnia-mcu: Refactor requesting MCU interrupt

Signed-off-by: Arnd Bergmann <[email protected]>

Author: arndb

Documentation/ABI/testing/debugfs-turris-mox-rwtm

@@ -12,15 +12,6 @@ Contact:	Marek Behún <[email protected]>
 Description:	(Read) MAC addresses burned into eFuses of this Turris Mox board.
 		Format: %pM
 
-What:		/sys/firmware/turris-mox-rwtm/pubkey
-Date:		August 2019
-KernelVersion:	5.4
-Contact:	Marek Behún <[email protected]>
-Description:	(Read) ECDSA public key (in pubkey hex compressed form) computed
-		as pair to the ECDSA private key burned into eFuses of this
-		Turris Mox Board.
-		Format: string
-
 What:		/sys/firmware/turris-mox-rwtm/ram_size
 Date:		August 2019
 KernelVersion:	5.4

Documentation/ABI/testing/sysfs-firmware-turris-mox-rwtm

@@ -2491,6 +2491,7 @@ F:	include/dt-bindings/bus/moxtet.h
 F:	include/linux/armada-37xx-rwtm-mailbox.h
 F:	include/linux/moxtet.h
 F:	include/linux/turris-omnia-mcu-interface.h
+F:	include/linux/turris-signing-key.h
 
 ARM/FARADAY FA526 PORT
 M:	Hans Ulli Kroll <[email protected]>

MAINTAINERS

@@ -268,6 +268,23 @@ config TURRIS_MOX_RWTM
 	  other manufacturing data and also utilize the Entropy Bit Generator
 	  for hardware random number generation.
 
+if TURRIS_MOX_RWTM
+
+config TURRIS_MOX_RWTM_KEYCTL
+	bool "Turris Mox rWTM ECDSA message signing"
+	default y
+	depends on KEYS
+	depends on ASYMMETRIC_KEY_TYPE
+	select CZNIC_PLATFORMS
+	select TURRIS_SIGNING_KEY
+	help
+	  Say Y here to add support for ECDSA message signing with board private
+	  key (each Turris Mox has an ECDSA private key generated in the secure
+	  coprocessor when manufactured). This functionality is exposed via the
+	  keyctl() syscall.
+
+endif # TURRIS_MOX_RWTM
+
 source "drivers/firmware/arm_ffa/Kconfig"
 source "drivers/firmware/broadcom/Kconfig"
 source "drivers/firmware/cirrus/Kconfig"