linux-kernel - [PATCH v3 2/3] soc: qcom: rpmh: Allow RPMH driver to be loaded as a module

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Date:   Thu, 26 Mar 2020 22:44:58 +0000
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>, Todd Kjos <tkjos@...gle.com>,
        Saravana Kannan <saravanak@...gle.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm@...r.kernel.org
Subject: [PATCH v3 2/3] soc: qcom: rpmh: Allow RPMH driver to be loaded as a module

This patch allow the rpmh driver to be loaded as a permenent
module. Meaning it can be loaded from a module, but then cannot
be unloaded.

Ideally, it would include a remove hook and related logic, but
the rpmh driver is fairly core to the system, so once its loaded
with almost anythign else to get the system to go, the dependencies
are not likely to ever also be removed.

So making it a permenent module at least improves things slightly
over requiring it to be a built in driver.

Feedback would be appreciated!

Cc: Todd Kjos <tkjos@...gle.com>
Cc: Saravana Kannan <saravanak@...gle.com>
Cc: Andy Gross <agross@...nel.org>
Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Rajendra Nayak <rnayak@...eaurora.org>
Cc: linux-arm-msm@...r.kernel.org
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 drivers/soc/qcom/Kconfig    | 2 +-
 drivers/soc/qcom/rpmh-rsc.c | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index af774555b9d2..ac91eaf810f7 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -104,7 +104,7 @@ config QCOM_RMTFS_MEM
 	  Say y here if you intend to boot the modem remoteproc.
 
 config QCOM_RPMH
-	bool "Qualcomm RPM-Hardened (RPMH) Communication"
+	tristate "Qualcomm RPM-Hardened (RPMH) Communication"
 	depends on ARCH_QCOM && ARM64 || COMPILE_TEST
 	help
 	  Support for communication with the hardened-RPM blocks in
diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index e278fc11fe5c..30585d98fdf1 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -11,6 +11,7 @@
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
+#include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
@@ -679,6 +680,8 @@ static const struct of_device_id rpmh_drv_match[] = {
 	{ .compatible = "qcom,rpmh-rsc", },
 	{ }
 };
+MODULE_DEVICE_TABLE(of, rpmh_drv_match);
+
 
 static struct platform_driver rpmh_driver = {
 	.probe = rpmh_rsc_probe,
@@ -693,3 +696,6 @@ static int __init rpmh_driver_init(void)
 	return platform_driver_register(&rpmh_driver);
 }
 arch_initcall(rpmh_driver_init);
+
+MODULE_DESCRIPTION("Qualcomm Technologies, Inc. RPMh Driver");
+MODULE_LICENSE("GPL v2");
-- 
2.17.1