linux-kernel - [PATCH v6 12/17] firmware: arm_scmi: Make shmem support optional for transports

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Date:   Mon, 12 Jul 2021 15:18:28 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        virtualization@...ts.linux-foundation.org,
        virtio-dev@...ts.oasis-open.org
Cc:     sudeep.holla@....com, james.quinlan@...adcom.com,
        Jonathan.Cameron@...wei.com, f.fainelli@...il.com,
        etienne.carriere@...aro.org, vincent.guittot@...aro.org,
        souvik.chakravarty@....com, cristian.marussi@....com,
        igor.skalkin@...nsynergy.com, peter.hilber@...nsynergy.com,
        alex.bennee@...aro.org, jean-philippe@...aro.org,
        mikhail.golubev@...nsynergy.com, anton.yakovlev@...nsynergy.com,
        Vasyl.Vavrychuk@...nsynergy.com,
        Andriy.Tryshnivskyy@...nsynergy.com
Subject: [PATCH v6 12/17] firmware: arm_scmi: Make shmem support optional for transports

From: Igor Skalkin <igor.skalkin@...nsynergy.com>

Upcoming new SCMI transports won't need any kind of shared memory support.
Compile shmem.c only if a shmem based transport is selected.

Signed-off-by: Igor Skalkin <igor.skalkin@...nsynergy.com>
[ Peter: Adapted patch for submission to upstream. ]
Co-developed-by: Peter Hilber <peter.hilber@...nsynergy.com>
Signed-off-by: Peter Hilber <peter.hilber@...nsynergy.com>
[ Cristian: Adapted patch/commit_msg to new SCMI Kconfig layout ]
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
v4 --> v5
- Adapted to new SCMI Kconfig layout
---
 drivers/firmware/arm_scmi/Kconfig  | 8 ++++++++
 drivers/firmware/arm_scmi/Makefile | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/arm_scmi/Kconfig b/drivers/firmware/arm_scmi/Kconfig
index 479fc8a3533e..ee6517b24080 100644
--- a/drivers/firmware/arm_scmi/Kconfig
+++ b/drivers/firmware/arm_scmi/Kconfig
@@ -28,10 +28,17 @@ config ARM_SCMI_HAVE_TRANSPORT
 	  Used to trigger a build bug when trying to build SCMI without any
 	  configured transport.
 
+config ARM_SCMI_HAVE_SHMEM
+	bool
+	help
+	  This declares whether a shared memory based transport for SCMI is
+	  available.
+
 config ARM_SCMI_TRANSPORT_MAILBOX
 	bool "SCMI transport based on Mailbox"
 	depends on ARM_SCMI_PROTOCOL && MAILBOX
 	select ARM_SCMI_HAVE_TRANSPORT
+	select ARM_SCMI_HAVE_SHMEM
 	default y
 	help
 	  Enable mailbox based transport for SCMI.
@@ -45,6 +52,7 @@ config ARM_SCMI_TRANSPORT_SMC
 	bool "SCMI transport based on SMC"
 	depends on ARM_SCMI_PROTOCOL && HAVE_ARM_SMCCC_DISCOVERY
 	select ARM_SCMI_HAVE_TRANSPORT
+	select ARM_SCMI_HAVE_SHMEM
 	default y
 	help
 	  Enable SMC based transport for SCMI.
diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile
index 38163d6991b3..e0e6bd3dba9e 100644
--- a/drivers/firmware/arm_scmi/Makefile
+++ b/drivers/firmware/arm_scmi/Makefile
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 scmi-bus-y = bus.o
 scmi-driver-y = driver.o notify.o
-scmi-transport-y = shmem.o
+scmi-transport-$(CONFIG_ARM_SCMI_HAVE_SHMEM) = shmem.o
 scmi-transport-$(CONFIG_ARM_SCMI_TRANSPORT_MAILBOX) += mailbox.o
 scmi-transport-$(CONFIG_ARM_SCMI_TRANSPORT_SMC) += smc.o
 scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o system.o voltage.o
-- 
2.17.1