linux-kernel - [PATCH v2] soc: qcom: rpmpd: Allow RPMPD driver to be loaded as a module

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Message-Id: <20200319194954.39853-1-john.stultz@linaro.org>
Date:   Thu, 19 Mar 2020 19:49:54 +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 v2] soc: qcom: rpmpd: Allow RPMPD driver to be loaded as a module

This patch allow the rpmpd 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
apparently the genpd code isn't able to track usage and cleaning
things up? (See: https://lkml.org/lkml/2019/1/24/38)

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>
---
v2:
* Fix MODULE_LICENSE to be GPL v2 as suggested by Bjorn
* Leave initcall as core_initcall, since that switches to module_initcall
  only when built as a module, also suggested by Bjorn
* Add module tags taken from Rajendra's earlier patch
---
 drivers/soc/qcom/Kconfig | 4 ++--
 drivers/soc/qcom/rpmpd.c | 6 ++++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index d0a73e76d563..af774555b9d2 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -123,8 +123,8 @@ config QCOM_RPMHPD
 	  for the voltage rail.
 
 config QCOM_RPMPD
-	bool "Qualcomm RPM Power domain driver"
-	depends on QCOM_SMD_RPM=y
+	tristate "Qualcomm RPM Power domain driver"
+	depends on QCOM_SMD_RPM
 	help
 	  QCOM RPM Power domain driver to support power-domains with
 	  performance states. The driver communicates a performance state
diff --git a/drivers/soc/qcom/rpmpd.c b/drivers/soc/qcom/rpmpd.c
index 2b1834c5609a..22fe94c03e79 100644
--- a/drivers/soc/qcom/rpmpd.c
+++ b/drivers/soc/qcom/rpmpd.c
@@ -5,6 +5,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/mutex.h>
+#include <linux/module.h>
 #include <linux/pm_domain.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
@@ -226,6 +227,7 @@ static const struct of_device_id rpmpd_match_table[] = {
 	{ .compatible = "qcom,qcs404-rpmpd", .data = &qcs404_desc },
 	{ }
 };
+MODULE_DEVICE_TABLE(of, rpmpd_match_table);
 
 static int rpmpd_send_enable(struct rpmpd *pd, bool enable)
 {
@@ -422,3 +424,7 @@ static int __init rpmpd_init(void)
 	return platform_driver_register(&rpmpd_driver);
 }
 core_initcall(rpmpd_init);
+
+MODULE_DESCRIPTION("Qualcomm Technologies, Inc. RPM Power Domain Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:qcom-rpmpd");
-- 
2.17.1