linux-kernel - Re: [PATCH 2/2] soc: mediatek: Add mtk-mmdvfs driver

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Date:   Wed, 15 Apr 2020 08:25:32 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Anthony Huang <anthony.huang@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wsd_upstream@...iatek.com
Subject: Re: [PATCH 2/2] soc: mediatek: Add mtk-mmdvfs driver

Hi--


On 4/15/20 4:18 AM, Anthony Huang wrote:
> Mediatek MMDVFS driver is used to set clk for Mediatek multimedia
> hardwares. The MMDVFS registers a regulator callback and multimedia

  hardware.

> hardwares set voltage by regulator API and then this callback will be

  hardware

> triggered. The MMDVFS will get current opp level from opp table according
> to the voltage, and then the MMDVFS sets all the clock MUXs to the clock
> sources according to the opp level.
> 
> On some platforms, both clock MUX and frequency hopping need to be used
> together. The MMDVFS supports these two clock setting methods and the
> execution sequence of them can be configured in DTS.
> 
> Signed-off-by: Anthony Huang <anthony.huang@...iatek.com>
> ---
>  drivers/soc/mediatek/Kconfig      |    9 ++
>  drivers/soc/mediatek/Makefile     |    1 +
>  drivers/soc/mediatek/mtk-mmdvfs.c |  312 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 322 insertions(+)
>  create mode 100644 drivers/soc/mediatek/mtk-mmdvfs.c
> 
> diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
> index 2114b56..e92762b 100644
> --- a/drivers/soc/mediatek/Kconfig
> +++ b/drivers/soc/mediatek/Kconfig
> @@ -44,4 +44,13 @@ config MTK_SCPSYS
>  	  Say yes here to add support for the MediaTek SCPSYS power domain
>  	  driver.
>  
> +config MTK_MMDVFS
> +	tristate "MediaTek MMDVFS Support"
> +	depends on ARCH_MEDIATEK || COMPILE_TEST
> +	help
> +	  Say yes here to add support for the MediaTek Multimedia DVFS (MMDVFS)
> +	  driver. The MMDVFS is used to set clk for Mediatek multimedia hardwares

	                                                                hardware,

> +	  , such as display, camera, mdp and video codec. Say no if your device

	  ^drop that comma.

> +	  does not need to do DVFS for Multimedia hardwares.

	                                          hardware.

> +
>  endmenu


thanks.
-- 
~Randy