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

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Date:   Thu, 26 Mar 2020 22:44:59 +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 3/3] soc: qcom: rpmhpd: Allow RPMHPD driver to be loaded as a module

This patch allow the rpmhpd 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?

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/rpmhpd.c | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index ac91eaf810f7..ffc04285840b 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -114,7 +114,7 @@ config QCOM_RPMH
 	  help apply the aggregated state on the resource.
 
 config QCOM_RPMHPD
-	bool "Qualcomm RPMh Power domain driver"
+	tristate "Qualcomm RPMh Power domain driver"
 	depends on QCOM_RPMH && QCOM_COMMAND_DB
 	help
 	  QCOM RPMh Power domain driver to support power-domains with
diff --git a/drivers/soc/qcom/rpmhpd.c b/drivers/soc/qcom/rpmhpd.c
index 4d264d0672c4..0bb12d5870a7 100644
--- a/drivers/soc/qcom/rpmhpd.c
+++ b/drivers/soc/qcom/rpmhpd.c
@@ -4,6 +4,7 @@
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/pm_domain.h>
 #include <linux/slab.h>
@@ -189,6 +190,7 @@ static const struct of_device_id rpmhpd_match_table[] = {
 	{ .compatible = "qcom,sm8150-rpmhpd", .data = &sm8150_desc },
 	{ }
 };
+MODULE_DEVICE_TABLE(of, rpmhpd_match_table);
 
 static int rpmhpd_send_corner(struct rpmhpd *pd, int state,
 			      unsigned int corner, bool sync)
@@ -460,3 +462,6 @@ static int __init rpmhpd_init(void)
 	return platform_driver_register(&rpmhpd_driver);
 }
 core_initcall(rpmhpd_init);
+
+MODULE_DESCRIPTION("Qualcomm Technologies, Inc. RPMh Power Domain Driver");
+MODULE_LICENSE("GPL v2");
-- 
2.17.1