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

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Date:   Tue, 14 Apr 2020 15:25:17 -0700
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>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v3 3/3] soc: qcom: rpmhpd: Allow RPMHPD driver to be
 loaded as a module

On Thu 26 Mar 15:44 PDT 2020, John Stultz wrote:

> 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>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

and applied.

Regards,
Bjorn

> ---
>  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
>