On Wed, Jul 28, 2021 at 03:50:33PM +0100, Sudeep Holla wrote:

On Mon, Jul 12, 2021 at 03:18:27PM +0100, Cristian Marussi wrote:

quoted

Add configuration options to be able to select which SCMI transports have
to be compiled into the SCMI stack.

Mailbox and SMC are by default enabled if their related dependencies are
satisfied.

While doing that move all SCMI related config options in their own
dedicated submenu.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
---
Used a BUILD_BUG_ON() to avoid the scenario where SCMI is configured
without any transport. Coul dnot do in any other way in Kconfig due to
circular dependencies.

This will be neeed later on to add new Virtio based transport and
optionally exclude other transports.
---

Hi Sudeep,

quoted

 drivers/firmware/Kconfig           | 34 +--------------
 drivers/firmware/arm_scmi/Kconfig  | 70 ++++++++++++++++++++++++++++++
 drivers/firmware/arm_scmi/Makefile |  4 +-
 drivers/firmware/arm_scmi/common.h |  4 +-
 drivers/firmware/arm_scmi/driver.c |  6 ++-
 5 files changed, 80 insertions(+), 38 deletions(-)
 create mode 100644 drivers/firmware/arm_scmi/Kconfig

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 1db738d5b301..8d41f73f5395 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig

@@ -6,39 +6,7 @@
 
 menu "Firmware Drivers"
 
-config ARM_SCMI_PROTOCOL
-	tristate "ARM System Control and Management Interface (SCMI) Message Protocol"
-	depends on ARM || ARM64 || COMPILE_TEST
-	depends on MAILBOX || HAVE_ARM_SMCCC_DISCOVERY
-	help
-	  ARM System Control and Management Interface (SCMI) protocol is a
-	  set of operating system-independent software interfaces that are
-	  used in system management. SCMI is extensible and currently provides
-	  interfaces for: Discovery and self-description of the interfaces
-	  it supports, Power domain management which is the ability to place
-	  a given device or domain into the various power-saving states that
-	  it supports, Performance management which is the ability to control
-	  the performance of a domain that is composed of compute engines
-	  such as application processors and other accelerators, Clock
-	  management which is the ability to set and inquire rates on platform
-	  managed clocks and Sensor management which is the ability to read
-	  sensor data, and be notified of sensor value.
-
-	  This protocol library provides interface for all the client drivers
-	  making use of the features offered by the SCMI.
-
-config ARM_SCMI_POWER_DOMAIN
-	tristate "SCMI power domain driver"
-	depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF)
-	default y
-	select PM_GENERIC_DOMAINS if PM
-	help
-	  This enables support for the SCMI power domains which can be
-	  enabled or disabled via the SCP firmware
-
-	  This driver can also be built as a module.  If so, the module
-	  will be called scmi_pm_domain. Note this may needed early in boot
-	  before rootfs may be available.
+source "drivers/firmware/arm_scmi/Kconfig"
 
 config ARM_SCPI_PROTOCOL
 	tristate "ARM System Control and Power Interface (SCPI) Message Protocol"

diff --git a/drivers/firmware/arm_scmi/Kconfig b/drivers/firmware/arm_scmi/Kconfig
new file mode 100644
index 000000000000..479fc8a3533e
--- /dev/null
+++ b/drivers/firmware/arm_scmi/Kconfig

@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menu "ARM System Control and Management Interface Protocol"
+
+config ARM_SCMI_PROTOCOL
+	tristate "ARM System Control and Management Interface (SCMI) Message Protocol"
+	depends on ARM || ARM64 || COMPILE_TEST
+	help
+	  ARM System Control and Management Interface (SCMI) protocol is a
+	  set of operating system-independent software interfaces that are
+	  used in system management. SCMI is extensible and currently provides
+	  interfaces for: Discovery and self-description of the interfaces
+	  it supports, Power domain management which is the ability to place
+	  a given device or domain into the various power-saving states that
+	  it supports, Performance management which is the ability to control
+	  the performance of a domain that is composed of compute engines
+	  such as application processors and other accelerators, Clock
+	  management which is the ability to set and inquire rates on platform
+	  managed clocks and Sensor management which is the ability to read
+	  sensor data, and be notified of sensor value.
+
+	  This protocol library provides interface for all the client drivers
+	  making use of the features offered by the SCMI.
+

May be you can add if condition here to remove the depends on ARM_SCMI_PROTOCOL

if ARM_SCMI_PROTOCOL

I'll do.

quoted

+config ARM_SCMI_HAVE_TRANSPORT
+	bool
+	help
+	  This declares whether at least one SCMI transport has been configured.
+	  Used to trigger a build bug when trying to build SCMI without any
+	  configured transport.
+
+config ARM_SCMI_TRANSPORT_MAILBOX
+	bool "SCMI transport based on Mailbox"
+	depends on ARM_SCMI_PROTOCOL && MAILBOX

And drop ARM_SCMI_PROTOCOL above

Ditto

quoted

+	select ARM_SCMI_HAVE_TRANSPORT
+	default y

Do we need a user visible choice if it is always default on ?

I'll leave for now as said offline to be able to not build unsupported
transport.

quoted

+	help
+	  Enable mailbox based transport for SCMI.
+
+	  If you want the ARM SCMI PROTOCOL stack to include support for a
+	  transport based on mailboxes, answer Y.
+	  A matching DT entry will also be needed to indicate the effective
+	  presence of this kind of transport.
+

I would drop the above comment on matching DT.

Yes right, I was in doubt in fact if it was sensible place for that
comment.

quoted

+config ARM_SCMI_TRANSPORT_SMC
+	bool "SCMI transport based on SMC"
+	depends on ARM_SCMI_PROTOCOL && HAVE_ARM_SMCCC_DISCOVERY

Ditto

DittoAck :D

quoted

+	select ARM_SCMI_HAVE_TRANSPORT
+	default y
+	help
+	  Enable SMC based transport for SCMI.
+
+	  If you want the ARM SCMI PROTOCOL stack to include support for a
+	  transport based on SMC, answer Y.
+	  A matching DT entry will also be needed to indicate the effective
+	  presence of this kind of transport.
+

endif #ARM_SCMI_PROTOCOL

Thanks,
Cristian

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