linux-kernel - Re: [v2 11/24] clk: mediatek: Add MT8195 ccusys clock support

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Date:   Fri, 10 Sep 2021 18:52:21 +0800
From:   Chun-Jie Chen <chun-jie.chen@...iatek.com>
To:     Chen-Yu Tsai <wenst@...omium.org>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>, <linux-clk@...r.kernel.org>,
        "Devicetree List" <devicetree@...r.kernel.org>,
        srv_heupstream <srv_heupstream@...iatek.com>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [v2 11/24] clk: mediatek: Add MT8195 ccusys clock support

On Mon, 2021-08-23 at 20:13 +0800, Chen-Yu Tsai wrote:
> On Fri, Aug 20, 2021 at 7:23 PM Chun-Jie Chen
> <chun-jie.chen@...iatek.com> wrote:
> > 
> > Add MT8195 ccusys clock controller which provides clock gate
> > control in Camera Computing Unit.
> 
> Could you offer a bit more explanation about this unit? Is it an ISP?
> Or some other function that does computation on images?
> 

CCU could access ISP HW control register and could be used for ISP
pipeline control. The use case is like secure camera or doing post-
processing on ISP statistic data.

Thanks!
Best Regards,
Chun-Jie

> > Signed-off-by: Chun-Jie Chen <chun-jie.chen@...iatek.com>
> > Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>
> > ---
> >  drivers/clk/mediatek/Makefile         |  3 +-
> >  drivers/clk/mediatek/clk-mt8195-ccu.c | 50
> > +++++++++++++++++++++++++++
> >  2 files changed, 52 insertions(+), 1 deletion(-)
> >  create mode 100644 drivers/clk/mediatek/clk-mt8195-ccu.c
> > 
> > diff --git a/drivers/clk/mediatek/Makefile
> > b/drivers/clk/mediatek/Makefile
> > index 718bbb04191b..03fb020834f3 100644
> > --- a/drivers/clk/mediatek/Makefile
> > +++ b/drivers/clk/mediatek/Makefile
> > @@ -80,6 +80,7 @@ obj-$(CONFIG_COMMON_CLK_MT8192_MSDC) += clk-
> > mt8192-msdc.o
> >  obj-$(CONFIG_COMMON_CLK_MT8192_SCP_ADSP) += clk-mt8192-scp_adsp.o
> >  obj-$(CONFIG_COMMON_CLK_MT8192_VDECSYS) += clk-mt8192-vdec.o
> >  obj-$(CONFIG_COMMON_CLK_MT8192_VENCSYS) += clk-mt8192-venc.o
> > -obj-$(CONFIG_COMMON_CLK_MT8195) += clk-mt8195-apmixedsys.o clk-
> > mt8195-topckgen.o clk-mt8195-peri_ao.o clk-mt8195-infra_ao.o clk-
> > mt8195-cam.o
> > +obj-$(CONFIG_COMMON_CLK_MT8195) += clk-mt8195-apmixedsys.o clk-
> > mt8195-topckgen.o clk-mt8195-peri_ao.o clk-mt8195-infra_ao.o clk-
> > mt8195-cam.o \
> > +                                       clk-mt8195-ccu.o
> 
> When wrapping, please align with previous line. "clk-mt8195-ccu.o"
> should
> align with "clk-mt8195-apmixedsys.o".
> 
> 
> ChenYu