linux-kernel - Re: [PATCH v9,1/7] thermal: mediatek: Relocate driver to mediatek folder

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Message-ID: <48cb4f47-754c-9994-2489-7ffabfc1b3b9@collabora.com>
Date:   Wed, 14 Sep 2022 13:58:32 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     bchihi@...libre.com, rafael@...nel.org, rui.zhang@...el.com,
        daniel.lezcano@...aro.org, amitk@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        khilman@...libre.com, mka@...omium.org, robh+dt@...nel.org,
        krzk+dt@...nel.org, matthias.bgg@...il.com, p.zabel@...gutronix.de,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, james.lo@...iatek.com,
        fan.chen@...iatek.com, louis.yu@...iatek.com,
        rex-bc.chen@...iatek.com, abailon@...libre.com
Subject: Re: [PATCH v9,1/7] thermal: mediatek: Relocate driver to mediatek
 folder

Il 17/08/22 10:07, bchihi@...libre.com ha scritto:
> From: Michael Kao <michael.kao@...iatek.com>
> 
> Add MediaTek proprietary folder to upstream more thermal zone and cooler
> drivers, relocate the original thermal controller driver to it, and rename it
> as "auxadc_thermal.c" to show its purpose more clearly.
> 
> Signed-off-by: Michael Kao <michael.kao@...iatek.com>
> Co-developed-by: Ben Tseng <ben.tseng@...iatek.com>
> Signed-off-by: Ben Tseng <ben.tseng@...iatek.com>
> Co-developed-by: Balsam CHIHI <bchihi@...libre.com>
> Signed-off-by: Balsam CHIHI <bchihi@...libre.com>
> ---
>   drivers/thermal/Kconfig                       | 14 ++++--------
>   drivers/thermal/Makefile                      |  2 +-
>   drivers/thermal/mediatek/Kconfig              | 22 +++++++++++++++++++
>   drivers/thermal/mediatek/Makefile             |  1 +
>   .../auxadc_thermal.c}                         |  2 +-
>   5 files changed, 29 insertions(+), 12 deletions(-)
>   create mode 100644 drivers/thermal/mediatek/Kconfig
>   create mode 100644 drivers/thermal/mediatek/Makefile
>   rename drivers/thermal/{mtk_thermal.c => mediatek/auxadc_thermal.c} (99%)
> 
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index e052dae614eb..d35f63daca3b 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -412,16 +412,10 @@ config DA9062_THERMAL
>   	  zone.
>   	  Compatible with the DA9062 and DA9061 PMICs.
>   
> -config MTK_THERMAL
> -	tristate "Temperature sensor driver for mediatek SoCs"
> -	depends on ARCH_MEDIATEK || COMPILE_TEST
> -	depends on HAS_IOMEM
> -	depends on NVMEM || NVMEM=n
> -	depends on RESET_CONTROLLER
> -	default y
> -	help
> -	  Enable this option if you want to have support for thermal management
> -	  controller present in Mediatek SoCs
> +menu "Mediatek thermal drivers"
> +depends on ARCH_MEDIATEK || COMPILE_TEST
> +source "drivers/thermal/mediatek/Kconfig"
> +endmenu
>   
>   config AMLOGIC_THERMAL
>   	tristate "Amlogic Thermal Support"
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index def8e1a0399c..f7daeb8056c4 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -55,7 +55,7 @@ obj-y				+= st/
>   obj-$(CONFIG_QCOM_TSENS)	+= qcom/
>   obj-y				+= tegra/
>   obj-$(CONFIG_HISI_THERMAL)     += hisi_thermal.o
> -obj-$(CONFIG_MTK_THERMAL)	+= mtk_thermal.o
> +obj-y				+= mediatek/
>   obj-$(CONFIG_GENERIC_ADC_THERMAL)	+= thermal-generic-adc.o
>   obj-$(CONFIG_UNIPHIER_THERMAL)	+= uniphier_thermal.o
>   obj-$(CONFIG_AMLOGIC_THERMAL)     += amlogic_thermal.o
> diff --git a/drivers/thermal/mediatek/Kconfig b/drivers/thermal/mediatek/Kconfig
> new file mode 100644
> index 000000000000..8ff32370b591
> --- /dev/null
> +++ b/drivers/thermal/mediatek/Kconfig
> @@ -0,0 +1,22 @@
> +config MTK_THERMAL
> +	tristate "MediaTek thermal drivers"
> +	depends on THERMAL_OF
> +	help
> +	  This is the option for MediaTek thermal software solutions.
> +	  Please enable corresponding options to get temperature
> +	  information from thermal sensors or turn on throttle
> +	  mechaisms for thermal mitigation.
> +
> +if MTK_THERMAL
> +
> +config MTK_SOC_THERMAL
> +	tristate "AUXADC temperature sensor driver for MediaTek SoCs"
> +	depends on HAS_IOMEM
> +	depends on NVMEM

That's not true. This driver doesn't depend on NVMEM, as in function
mtk_thermal_get_calibration_data(), the calibration params are initialized
with default values and if no "calibration-data" cell was found, it will
return 0 and simply go on with probing... and this is because not all SoCs
need calibration data from eFuses.
If you check carefully, the original entry says "NVMEM || NVMEM=n".

Please drop the NVMEM dependency from this config entirely.

> +	depends on RESET_CONTROLLER

While at it, can you please also drop the dependency for RESET_CONTROLLER?
I know it was present on the original config entry, but that's wrong, as
the driver doesn't strictly require resets, as it uses device_reset_optional().


Regards,
Angelo