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Date: Tue, 20 Oct 2020 10:14:35 -0500
From: Rob Herring <robh+dt@...nel.org>
To: Helen Koike <helen.koike@...labora.com>
Cc: devicetree@...r.kernel.org,
Linux Media Mailing List <linux-media@...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>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Collabora Kernel ML <kernel@...labora.com>,
Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
Ezequiel Garcia <ezequiel@...labora.com>,
Mark Rutland <mark.rutland@....com>, karthik.poduval@...il.com,
Johan Jonker <jbx6244@...il.com>,
Tomasz Figa <tfiga@...omium.org>,
Eddie Cai <eddie.cai.linux@...il.com>,
Shunqian Zheng <zhengsq@...k-chips.com>,
Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v5 5/9] media: staging: rkisp1: remove unecessary clocks
On Wed, Oct 14, 2020 at 11:46 AM Helen Koike <helen.koike@...labora.com> wrote:
>
> Hi Rob,
>
> Thnaks for your reply.
>
> On 9/22/20 11:24 AM, Rob Herring wrote:
> > On Wed, Jul 22, 2020 at 9:56 AM 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>
> >>
> >> ---
> >> Changes in V5:
> >> - Use if/then schema as suggested by Rob Herring on
> >> https://patchwork.linuxtv.org/project/linux-media/patch/20200702191322.2639681-6-helen.koike@collabora.com/#119729
> >>
> >> Changes in V4:
> >> - update binding according to suggestion by Robin Murphy
> >> on https://patchwork.kernel.org/patch/11475007/
> >>
> >> Changes in V3:
> >> - this is a new patch in the series
> >> ---
> >> .../bindings/media/rockchip-isp1.yaml | 50 ++++++++++++-------
> >> drivers/staging/media/rkisp1/rkisp1-dev.c | 8 ++-
> >> 2 files changed, 36 insertions(+), 22 deletions(-)
> >>
> >> diff --git a/drivers/staging/media/rkisp1/Documentation/devicetree/bindings/media/rockchip-isp1.yaml b/drivers/staging/media/rkisp1/Documentation/devicetree/bindings/media/rockchip-isp1.yaml
> >> index 62a6b9c959498..23c677d15037a 100644
> >> --- a/drivers/staging/media/rkisp1/Documentation/devicetree/bindings/media/rockchip-isp1.yaml
> >> +++ b/drivers/staging/media/rkisp1/Documentation/devicetree/bindings/media/rockchip-isp1.yaml
> >> @@ -24,20 +24,10 @@ properties:
> >> maxItems: 1
> >>
> >> clocks:
> >> - items:
> >> - - description: ISP clock
> >> - - description: ISP AXI clock clock
> >> - - description: ISP AXI clock wrapper clock
> >> - - description: ISP AHB clock clock
> >> - - description: ISP AHB wrapper clock
> >> + minItems: 3
> >
> > You need maxItems here too or it will always be 3.
> >
> >>
> >> clock-names:
> >> - items:
> >> - - const: clk_isp
> >> - - const: aclk_isp
> >> - - const: aclk_isp_wrap
> >> - - const: hclk_isp
> >> - - const: hclk_isp_wrap
> >> + minItems: 3
> >>
> >> iommus:
> >> maxItems: 1
> >> @@ -116,6 +106,34 @@ required:
> >> - power-domains
> >> - ports
> >>
> >> +if:
> >> + properties:
> >> + compatible:
> >> + contains:
> >> + const: rockchip,rk3399-cif-isp
> >> +then:
> >> + properties:
> >> + clocks:
> >> + maxItems: 4
> >> + minItems: 3
> >
> > For a single compatible you shouldn't really have a variable number of clocks.
>
> I'm not entirely sure how to make this separation, since isp0 and isp1 (not yet supported)
> would use the same compatible.
> Unless if we separate in two compatibles, but maybe this is an overhead just for an extra clock.
> What do you think?
In that case, it's fine.
>
> >
> >> + items:
> >> + # isp0 and isp1
> >> + - description: ISP clock
> >> + - description: ISP AXI clock
> >> + - description: ISP AHB clock
> >> + # only for isp1
> >> + - description: ISP Pixel clock
> >> + clock-names:
> >> + maxItems: 4
> >> + minItems: 3
> >> + items:
> >> + # isp0 and isp1
> >> + - const: isp
> >> + - const: aclk
> >> + - const: hclk
> >> + # only for isp1
> >> + - const: pclk_isp
> >
> > Don't you need an 'else' clause. For not rockchip,rk3399-cif-isp,
> > there's no definition of what clocks there are.
>
> There is only one compatible defined for now, rk3288 will be added later.
> The idea to add if/then is to make it easier to add rk3288:
>
> https://patchwork.kernel.org/project/linux-media/patch/20200406073017.19462-4-karthik.poduval@gmail.com/
Hopefully, the clock names will be aligned? Looks like they are the
same with just 1 additional clock. Ideally, you define them all at the
top level and the if/then schema just defines how many clocks for each
compatible.
Rob
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