Re: [PATCH v3 1/3] cpufreq: mediatek: Add support of cpufreq to MT2701/MT7623 SoC

[Jean Delvare]

Hi Sean,

On ven., 2017-07-07 at 11:56 +0800, sean.wang@xxxxxxxxxxxx wrote:
> From: Sean Wang <sean.wang@xxxxxxxxxxxx>
> 
> MT2701/MT7623 is a 32-bit ARMv7 based quad-core (4 * Cortex-A7) with
> single cluster and this hardware is also compatible with the existing
> driver through enabling CPU frequency feature with operating-points-v2
> bindings. Also, this driver actually supports all MediaTek SoCs, the
> Kconfig menu entry and file name itself should be updated with more
> generic name to drop "MT8173"
> 
> Signed-off-by: Sean Wang <sean.wang@xxxxxxxxxxxx>
> Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
> ---
>  drivers/cpufreq/Kconfig.arm                         | 8 ++++----
>  drivers/cpufreq/Makefile                            | 2 +-
>  drivers/cpufreq/{mt8173-cpufreq.c => mtk-cpufreq.c} | 2 ++
>  3 files changed, 7 insertions(+), 5 deletions(-)
>  rename drivers/cpufreq/{mt8173-cpufreq.c => mtk-cpufreq.c} (99%)
> 
> diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
> index 74ed7e9..79aece7 100644
> --- a/drivers/cpufreq/Kconfig.arm
> +++ b/drivers/cpufreq/Kconfig.arm
> @@ -87,14 +87,14 @@ config ARM_KIRKWOOD_CPUFREQ
>  	  This adds the CPUFreq driver for Marvell Kirkwood
>  	  SoCs.
>  
> -config ARM_MT8173_CPUFREQ
> -	tristate "Mediatek MT8173 CPUFreq support"
> +config ARM_MEDIATEK_CPUFREQ
> +	tristate "CPU Frequency scaling support for MediaTek SoCs"
>  	depends on ARCH_MEDIATEK && REGULATOR
> -	depends on ARM64 || (ARM_CPU_TOPOLOGY && COMPILE_TEST)
> +	depends on ARM || ARM64 || COMPILE_TEST

This statement no longer serves any purpose. The whole Kconfig.arm file
depends on ARM || ARM64, so you can drop it. As a matter of fact no
other entry in this file has the dependency.

>  	depends on !CPU_THERMAL || THERMAL
>  	select PM_OPP
>  	help
> -	  This adds the CPUFreq driver support for Mediatek MT8173 SoC.
> +	  This adds the CPUFreq driver support for MediaTek SoCs.
>  
>  config ARM_OMAP2PLUS_CPUFREQ
>  	bool "TI OMAP2+"
> diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
> index b7e78f0..4956f5d 100644
> --- a/drivers/cpufreq/Makefile
> +++ b/drivers/cpufreq/Makefile
> @@ -58,7 +58,7 @@ obj-$(CONFIG_ARM_EXYNOS5440_CPUFREQ)	+= exynos5440-cpufreq.o
>  obj-$(CONFIG_ARM_HIGHBANK_CPUFREQ)	+= highbank-cpufreq.o
>  obj-$(CONFIG_ARM_IMX6Q_CPUFREQ)		+= imx6q-cpufreq.o
>  obj-$(CONFIG_ARM_KIRKWOOD_CPUFREQ)	+= kirkwood-cpufreq.o
> -obj-$(CONFIG_ARM_MT8173_CPUFREQ)	+= mt8173-cpufreq.o
> +obj-$(CONFIG_ARM_MEDIATEK_CPUFREQ)	+= mtk-cpufreq.o

I would have preferred mediatek-cpufreq. 3-letter abbreviations are
likely to collide and cause confusion at some point in time. However it
seems I am late to the party, I see that there are already many files
named mtk-* or *-mtk.*... So, so be it.

Also the file describing the bindings is namedÂcpufreq-mediatek.txt,
which is inconsistent... But the situation is the same for a few other
cpufreq drivers already, so I suppose this is acceptable.

>  obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ)	+= omap-cpufreq.o
>  obj-$(CONFIG_ARM_PXA2xx_CPUFREQ)	+= pxa2xx-cpufreq.o
>  obj-$(CONFIG_PXA3xx)			+= pxa3xx-cpufreq.o
> diff --git a/drivers/cpufreq/mt8173-cpufreq.c b/drivers/cpufreq/mtk-cpufreq.c
> similarity index 99%
> rename from drivers/cpufreq/mt8173-cpufreq.c
> rename to drivers/cpufreq/mtk-cpufreq.c
> index fd1886f..481ec77 100644
> --- a/drivers/cpufreq/mt8173-cpufreq.c
> +++ b/drivers/cpufreq/mtk-cpufreq.c
> @@ -575,6 +575,8 @@ static struct platform_driver mt8173_cpufreq_platdrv = {
>  
>  /* List of machines supported by this driver */
>  static const struct of_device_id mt8173_cpufreq_machines[] __initconst = {
> +	{ .compatible = "mediatek,mt2701", },
> +	{ .compatible = "mediatek,mt7623", },
>  	{ .compatible = "mediatek,mt817x", },
>  	{ .compatible = "mediatek,mt8173", },
>  	{ .compatible = "mediatek,mt8176", },

Reviewed-by: Jean Delvare <jdelvare@xxxxxxx>

-- 
Jean Delvare
SUSE L3 Support