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

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Date:   Wed, 4 Mar 2020 22:32:54 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>, Todd Kjos <tkjos@...gle.com>,
        Saravana Kannan <saravanak@...gle.com>,
        Andy Gross <agross@...nel.org>, linux-arm-msm@...r.kernel.org
Subject: Re: [RFC][PATCH] soc: qcom: rpmpd: Allow RPMPD driver to be loaded
 as a module

On Wed 04 Mar 21:42 PST 2020, John Stultz wrote:

> Allow the rpmpd driver to be loaded as a module.
> 
> 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: linux-arm-msm@...r.kernel.org
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> ---
>  drivers/soc/qcom/Kconfig | 4 ++--
>  drivers/soc/qcom/rpmpd.c | 5 ++++-
>  2 files changed, 6 insertions(+), 3 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..9c0834913f3f 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)
>  {
> @@ -421,4 +423,5 @@ static int __init rpmpd_init(void)
>  {
>  	return platform_driver_register(&rpmpd_driver);
>  }
> -core_initcall(rpmpd_init);
> +module_init(rpmpd_init);

Can't you keep this as core_initcall(), for the times when its builtin?

Additionally I believe you should add a call to unregister the driver,
and drop the suppress_bind_attrs.

> +MODULE_LICENSE("GPL");

"GPL v2" per the SPDX?

Regards,
Bjorn

> -- 
> 2.17.1
>