linux-kernel - Re: [PATCH v6 5/9] media: staging: rkisp1: remove unecessary clocks

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Date:   Thu, 29 Oct 2020 15:04:16 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Helen Koike <helen.koike@...labora.com>
Cc:     Linux Media Mailing List <linux-media@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
        "heiko@...ech.de" <heiko@...ech.de>,
        Collabora Kernel ML <kernel@...labora.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Mark Rutland <mark.rutland@....com>, karthik.poduval@...il.com,
        Eddie Cai <eddie.cai.linux@...il.com>,
        Johan Jonker <jbx6244@...il.com>,
        Shunqian Zheng <zhengsq@...k-chips.com>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v6 5/9] media: staging: rkisp1: remove unecessary clocks

On Tue, Oct 20, 2020 at 2:39 PM Helen Koike <helen.koike@...labora.com> wrote:
>
> aclk_isp_wrap is a child of aclk_isp, and hclk_isp_wrap is a child of
> hclk_isp, thus we can remove parents from the list.
>
> Also, for the isp0, we only need the ISP clock, ACLK and HCLK.
> In the future we'll need a pixel clock for RK3288 and RK3399, and a JPEG
> clock for RK3288.
>
> So with the goal to cleanup the dt-bindings and remove it from staging,
> simplify clock names to isp, aclk and hclk.
>
> Assigned clocks are meant to refer to the full path in the clock tree,
> i.e. the leaf in the tree.
> For instance, in RK3399, the clock responsible for ACLK (ISP AXI CLOCK)
> is aclk_isp0_wrapper.
>
> For reference, this is the isp clock topology on RK3399:
>
>  xin24m
>     pll_npll
>        npll
>           clk_isp1
>           clk_isp0
>     pll_cpll
>        cpll
>           aclk_isp1
>              aclk_isp1_noc
>              hclk_isp1
>                 aclk_isp1_wrapper
>                 hclk_isp1_noc
>           aclk_isp0
>              hclk_isp1_wrapper
>              aclk_isp0_wrapper
>              aclk_isp0_noc
>              hclk_isp0
>                 hclk_isp0_wrapper
>                 hclk_isp0_noc
>  pclkin_isp1_wrapper
>
> Signed-off-by: Helen Koike <helen.koike@...labora.com>
> Reviewed-by: Tomasz Figa <tfiga@...omium.org>
>
> ---
>
> Changes in V6:
> - Define clocks in the top level, and use if/else schema to define how
>   many for each compatible as sugested by Rob Herring on
>   https://patchwork.linuxtv.org/project/linux-media/patch/20200722155533.252844-6-helen.koike@collabora.com/#122626
> ---
>  .../bindings/media/rockchip-isp1.yaml         | 44 +++++++++++++------
>  drivers/staging/media/rkisp1/rkisp1-dev.c     |  8 ++--
>  2 files changed, 33 insertions(+), 19 deletions(-)

Reviewed-by: Rob Herring <robh@...nel.org>