linux-kernel - Re: [PATCH v2 2/2] soc: qcom: rpmh: Allow RPMH driver to be loaded as a module

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Date:   Wed, 26 Aug 2020 20:58:24 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Maulik Shah <mkshah@...eaurora.org>
Cc:     andy.gross@...aro.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, ulf.hansson@...aro.org,
        swboyd@...omium.org, dianders@...omium.org, rnayak@...eaurora.org,
        ilina@...eaurora.org, lsrao@...eaurora.org,
        John Stultz <john.stultz@...aro.org>,
        Todd Kjos <tkjos@...gle.com>,
        Saravana Kannan <saravanak@...gle.com>,
        Andy Gross <agross@...nel.org>
Subject: Re: [PATCH v2 2/2] soc: qcom: rpmh: Allow RPMH driver to be loaded
 as a module

On Tue 25 Aug 06:21 CDT 2020, Maulik Shah wrote:

> From: John Stultz <john.stultz@...aro.org>
> 
> 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 anything else to get the system to go, the dependencies
> are not likely to ever also be removed.
> 
> So making it a permanent module at least improves things slightly
> over requiring it to be a built in driver.
> 
> 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>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> [mkshah: Fix typos in commit message, send after removing _rcuidle trace]
> Signed-off-by: Maulik Shah <mkshah@...eaurora.org>

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

Regards,
Bjorn

> ---
>  drivers/soc/qcom/Kconfig    | 2 +-
>  drivers/soc/qcom/rpmh-rsc.c | 5 +++++
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
> index 3dc3e3d..892bdc7 100644
> --- a/drivers/soc/qcom/Kconfig
> +++ b/drivers/soc/qcom/Kconfig
> @@ -92,7 +92,7 @@ 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 || 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 fabe390d..5fce87c 100644
> --- a/drivers/soc/qcom/rpmh-rsc.c
> +++ b/drivers/soc/qcom/rpmh-rsc.c
> @@ -13,6 +13,7 @@
>  #include <linux/iopoll.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>
> @@ -1025,6 +1026,7 @@ 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,
> @@ -1040,3 +1042,6 @@ 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");
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>