linux-kernel - RE: [PATCH v11] arm64: dts: imx8qxp: Add jpeg encoder/decoder nodes

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Date:   Tue, 18 May 2021 07:10:01 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Shawn Guo <shawnguo@...nel.org>,
        "Mirela Rabulea (OSS)" <mirela.rabulea@....nxp.com>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "G.n. Zhou" <guoniu.zhou@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Peng Fan <peng.fan@....com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "paul.kocialkowski@...tlin.com" <paul.kocialkowski@...tlin.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Robert Chiras <robert.chiras@....com>,
        Laurentiu Palcu <laurentiu.palcu@....com>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "ezequiel@...labora.com" <ezequiel@...labora.com>,
        Mirela Rabulea <mirela.rabulea@....com>
Subject: RE: [PATCH v11] arm64: dts: imx8qxp: Add jpeg encoder/decoder nodes

> From: Shawn Guo <shawnguo@...nel.org>
> Sent: Thursday, May 13, 2021 3:39 PM
> 
> On Fri, Apr 23, 2021 at 01:14:14PM +0300, Mirela Rabulea (OSS) wrote:
> > From: Mirela Rabulea <mirela.rabulea@....com>
> >
> > Add dts for imaging subsytem, include jpeg nodes here.
> > Tested on imx8qxp only, should work on imx8qm, but it was not tested.
> >
> > Signed-off-by: Mirela Rabulea <mirela.rabulea@....com>
> 
> So the bindings and driver parts have been accepted already?
> 
> > ---
> > Changes in v11:
> >   Adress feedback from Aisheng Dong:
> >   - Rename img_jpeg_dec_clk/img_jpeg_enc_clk to
> jpeg_dec_lpcg/jpeg_enc_lpcg to make it visible it's lpcg not other type of clk
> >   - Drop the cameradev node, not needed for jpeg
> >   - Match assigned-clocks & assigned-clock-rates
> >
> >  .../arm64/boot/dts/freescale/imx8-ss-img.dtsi | 82
> +++++++++++++++++++
> >  arch/arm64/boot/dts/freescale/imx8qxp.dtsi    |  1 +
> >  2 files changed, 83 insertions(+)
> >  create mode 100644 arch/arm64/boot/dts/freescale/imx8-ss-img.dtsi
> >
> > diff --git a/arch/arm64/boot/dts/freescale/imx8-ss-img.dtsi
> b/arch/arm64/boot/dts/freescale/imx8-ss-img.dtsi
> > new file mode 100644
> > index 000000000000..c508e5d0c92b
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/freescale/imx8-ss-img.dtsi
> > @@ -0,0 +1,82 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright 2019-2021 NXP
> > + * Zhou Guoniu <guoniu.zhou@....com>
> > + */
> > +img_subsys: bus@...00000 {
> > +	compatible = "simple-bus";
> > +	#address-cells = <1>;
> > +	#size-cells = <1>;
> > +	ranges = <0x58000000 0x0 0x58000000 0x1000000>;
> > +
> > +	img_ipg_clk: clock-img-ipg {
> > +		compatible = "fixed-clock";
> > +		#clock-cells = <0>;
> > +		clock-frequency = <200000000>;
> > +		clock-output-names = "img_ipg_clk";
> > +	};
> 
> Hmm, not sure a fixed-clock should be in the subsystem.

Each subsystem has its own fixed clock slice. (Independent with 
other subsystems). So we put it in the subsystem dtsi.

Regards
Aisheng