Re: [PATCH v6 13/13] arm64: dts: imx8mq: Add node to G2 hardware

From: Ezequiel Garcia <ezequiel@collabora.com>
To: Benjamin Gaignard <benjamin.gaignard@collabora.com>,
	Philipp Zabel <pza@pengutronix.de>
Cc: mchehab@kernel.org, robh+dt@kernel.org, shawnguo@kernel.org,
	s.hauer@pengutronix.de, festevam@gmail.com, lee.jones@linaro.org,
	gregkh@linuxfoundation.org, mripard@kernel.org,
	paul.kocialkowski@bootlin.com, wens@csie.org,
	jernej.skrabec@siol.net, hverkuil-cisco@xs4all.nl,
	emil.l.velikov@gmail.com, kernel@pengutronix.de,
	linux-imx@nxp.com, linux-media@vger.kernel.org,
	linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org,
	kernel@collabora.com
Subject: Re: [PATCH v6 13/13] arm64: dts: imx8mq: Add node to G2 hardware
Date: Fri, 26 Mar 2021 12:28:25 -0300	[thread overview]
Message-ID: <986ee841d0c512a6f0ffe9dfa2e0803980b02aa0.camel@collabora.com> (raw)
In-Reply-To: <4df3c9e4-0983-6007-f3b3-323882f903cf@collabora.com>

On Fri, 2021-03-26 at 15:33 +0100, Benjamin Gaignard wrote:
> 
> Le 26/03/2021 à 15:24, Philipp Zabel a écrit :
> > On Thu, Mar 18, 2021 at 09:20:46AM +0100, Benjamin Gaignard wrote:
> > > Split VPU node in two: one for G1 and one for G2 since they are
> > > different hardware blocks.
> > > Add syscon for hardware control block.
> > > Remove reg-names property that is useless.
> > > Each VPU node only need one interrupt.
> > > 
> > > Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> > > ---
> > > version 5:
> > >   - use syscon instead of VPU reset
> > > 
> > >   arch/arm64/boot/dts/freescale/imx8mq.dtsi | 43 ++++++++++++++++++-----
> > >   1 file changed, 34 insertions(+), 9 deletions(-)
> > > 
> > > diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> > > index 17c449e12c2e..b537d153ebbd 100644
> > > --- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> > > +++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> > > @@ -1329,15 +1329,16 @@ usb3_phy1: usb-phy@382f0040 {
> > >                         status = "disabled";
> > >                 };
> > >   
> > > -               vpu: video-codec@38300000 {
> > > +               vpu_ctrl: syscon@38320000 {
> > > +                       compatible = "nxp,imx8mq-vpu-ctrl", "syscon";
> > > +                       reg = <0x38320000 0x10000>;
> > > +               };
> > > +
> > > +               vpu_g1: video-codec@38300000 {
> > >                         compatible = "nxp,imx8mq-vpu";
> > > -                       reg = <0x38300000 0x10000>,
> > > -                             <0x38310000 0x10000>,
> > > -                             <0x38320000 0x10000>;
> > > -                       reg-names = "g1", "g2", "ctrl";
> > > -                       interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
> > > -                                    <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
> > > -                       interrupt-names = "g1", "g2";
> > > +                       reg = <0x38300000 0x10000>;
> > > +                       interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
> > > +                       interrupt-names = "g1";
> > >                         clocks = <&clk IMX8MQ_CLK_VPU_G1_ROOT>,
> > >                                  <&clk IMX8MQ_CLK_VPU_G2_ROOT>,
> > >                                  <&clk IMX8MQ_CLK_VPU_DEC_ROOT>;
> > > @@ -1350,9 +1351,33 @@ vpu: video-codec@38300000 {
> > >                                                  <&clk IMX8MQ_VPU_PLL_OUT>,
> > >                                                  <&clk IMX8MQ_SYS1_PLL_800M>,
> > >                                                  <&clk IMX8MQ_VPU_PLL>;
> > > -                       assigned-clock-rates = <600000000>, <600000000>,
> > > +                       assigned-clock-rates = <600000000>, <300000000>,
> > I'd like to see this mentioned in the commit message.
> 
> Yes I would do that.
> The value comes from the datasheet.
> 
> > 
> > > +                                              <800000000>, <0>;
> > > +                       power-domains = <&pgc_vpu>;
> > > +                       nxp,imx8mq-vpu-ctrl = <&vpu_ctrl>;
> > > +               };
> > > +
> > > +               vpu_g2: video-codec@38310000 {
> > > +                       compatible = "nxp,imx8mq-vpu-g2";
> > > +                       reg = <0x38310000 0x10000>;
> > > +                       interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
> > > +                       interrupt-names = "g2";
> > > +                       clocks = <&clk IMX8MQ_CLK_VPU_G1_ROOT>,
> > > +                                <&clk IMX8MQ_CLK_VPU_G2_ROOT>,
> > > +                                <&clk IMX8MQ_CLK_VPU_DEC_ROOT>;
> > > +                       clock-names = "g1", "g2",  "bus";
> > > +                       assigned-clocks = <&clk IMX8MQ_CLK_VPU_G1>,
> > Can the G1 clock configuration be dropped from the G2 device node and
> > the G2 clock configuration from the G1 device node? It looks weird that
> > these devices configure each other's clocks.
> 
> No because if only one device node is enabled we need to configure the both
> clocks anyway.
> 

Since this is akward, how about adding a comment here in the dtsi to clarify it?

Thanks,
Ezequiel