linux-kernel - Re: [PATCH v2 1/2] thermal: Introduce CONFIG_QCOM

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Message-ID: <20220913185130.4eui3q2cvwjn4t7x@builder.lan>
Date:   Tue, 13 Sep 2022 13:51:30 -0500
From:   Bjorn Andersson <andersson@...nel.org>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        bhupesh.linux@...il.com, linux-arm-msm@...r.kernel.org,
        daniel.lezcano@...aro.org, rafael@...nel.org,
        dmitry.baryshkov@...aro.org, Amit Kucheria <amitk@...nel.org>,
        Thara Gopinath <thara.gopinath@...il.com>
Subject: Re: [PATCH v2 1/2] thermal: Introduce CONFIG_QCOM_THERMAL in
 Makefile and qcom/Kconfig

On Tue, Sep 13, 2022 at 01:10:27AM +0530, Bhupesh Sharma wrote:
> Introduce CONFIG_QCOM_THERMAL to allow better control
> over selection of various Qualcomm Thermal drivers
> available inside qcom/ directory.
> 
> This is a preparatory change to allow new drivers to
> be added inside qcom/ directory in a more structured
> fashion later-on.
> 
> Cc: Bjorn Andersson <andersson@...nel.org>
> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> Cc: Amit Kucheria <amitk@...nel.org>
> Cc: Thara Gopinath <thara.gopinath@...il.com>
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
> - v1 can be viewed here: https://www.spinics.net/lists/kernel/msg4510793.html
> - Fixed review comments from Dmitry received in v1.
> 
>  drivers/thermal/Makefile     |  2 +-
>  drivers/thermal/qcom/Kconfig | 12 ++++++++++++
>  2 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index def8e1a0399c..2506c6c8ca83 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -52,7 +52,7 @@ obj-$(CONFIG_DA9062_THERMAL)	+= da9062-thermal.o
>  obj-y				+= intel/
>  obj-$(CONFIG_TI_SOC_THERMAL)	+= ti-soc-thermal/
>  obj-y				+= st/
> -obj-$(CONFIG_QCOM_TSENS)	+= qcom/
> +obj-y				+= qcom/

This change makes sense to me. Please send this as a separate patch.

>  obj-y				+= tegra/
>  obj-$(CONFIG_HISI_THERMAL)     += hisi_thermal.o
>  obj-$(CONFIG_MTK_THERMAL)	+= mtk_thermal.o
> diff --git a/drivers/thermal/qcom/Kconfig b/drivers/thermal/qcom/Kconfig
> index 2c7f3f9a26eb..ccfd090273c1 100644
> --- a/drivers/thermal/qcom/Kconfig
> +++ b/drivers/thermal/qcom/Kconfig
> @@ -1,8 +1,17 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> +
> +config QCOM_THERMAL

As written here this would allow you to make things conditional on any
Qualcomm thermal code being enabled in any form. But I'm afraid I don't
understand the purpose of this.

Alternatively if you had made below additions depends on QCOM_THERMAL
this would have "cleaned up" the menuconfig slightly. But IMHO there
isn't a lot of benefit to this (and we'd end up with people running
without thermal drivers, as they forget to set CONFIG_QCOM_THERMAL).

> +	tristate "Thermal drivers on Qualcomm Snapdragon series of SoCs"
> +	help
> +	  Support for thermal drivers on Qualcomm Snapdragon series of SoCs.
> +	  There are several thermal sensors available on the Qualcomm Socs
> +	  which can be used for thermal mitigation purposes.

This help text indicates that the option actually changes something or
enables some support for something, but afaict it doesn't.

Regards,
Bjorn
> +
>  config QCOM_TSENS
>  	tristate "Qualcomm TSENS Temperature Alarm"
>  	depends on NVMEM_QCOM_QFPROM
>  	depends on ARCH_QCOM || COMPILE_TEST
> +	select QCOM_THERMAL
>  	help
>  	  This enables the thermal sysfs driver for the TSENS device. It shows
>  	  up in Sysfs as a thermal zone with multiple trip points. Disabling the
> @@ -15,6 +24,7 @@ config QCOM_SPMI_ADC_TM5
>  	depends on OF && SPMI && IIO
>  	select REGMAP_SPMI
>  	select QCOM_VADC_COMMON
> +	select QCOM_THERMAL
>  	help
>  	  This enables the thermal driver for the ADC thermal monitoring
>  	  device. It shows up as a thermal zone with multiple trip points.
> @@ -25,6 +35,7 @@ config QCOM_SPMI_TEMP_ALARM
>  	tristate "Qualcomm SPMI PMIC Temperature Alarm"
>  	depends on OF && SPMI && IIO
>  	select REGMAP_SPMI
> +	select QCOM_THERMAL
>  	help
>  	  This enables a thermal sysfs driver for Qualcomm plug-and-play (QPNP)
>  	  PMIC devices. It shows up in sysfs as a thermal sensor with multiple
> @@ -35,6 +46,7 @@ config QCOM_SPMI_TEMP_ALARM
>  config QCOM_LMH
>  	tristate "Qualcomm Limits Management Hardware"
>  	depends on ARCH_QCOM && QCOM_SCM
> +	select QCOM_THERMAL
>  	help
>  	  This enables initialization of Qualcomm limits management
>  	  hardware(LMh). LMh allows for hardware-enforced mitigation for cpus based on
> -- 
> 2.37.1
>