Re: [PATCH v2 6/8] arm64: dts: r8a77990: Add VIN and CSI-2 device nodes

[jacopo mondi <jacopo@jmondi.org>]

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Hi Simon,

On Wed, Oct 31, 2018 at 01:48:13PM +0100, Simon Horman wrote:
> On Tue, Oct 30, 2018 at 02:57:59PM +0200, Laurent Pinchart wrote:
> > Hi Jacopo,
> >
> > On Tuesday, 30 October 2018 12:14:31 EET jacopo mondi wrote:
> > > On Mon, Sep 10, 2018 at 05:12:30PM +0300, Laurent Pinchart wrote:
> > > > On Wednesday, 5 September 2018 18:29:43 EEST Jacopo Mondi wrote:
> > > >> From: Koji Matsuoka <koji.matsuoka.xm@renesas.com>
> > > >>
> > > >> Add device nodes for VIN4, VIN5 and CSI40 to R-Car E3 R8A77990 device
> > > >> tree.
> > > >>
> > > >> Signed-off-by: Koji Matsuoka <koji.matsuoka.xm@renesas.com>
> > > >> Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
> > > >> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> > > >> ---
> > > >>
> > > >>  arch/arm64/boot/dts/renesas/r8a77990.dtsi | 79 ++++++++++++++++++++++++
> > > >>  1 file changed, 79 insertions(+)
> > > >>
> > > >> diff --git a/arch/arm64/boot/dts/renesas/r8a77990.dtsi
> > > >> b/arch/arm64/boot/dts/renesas/r8a77990.dtsi index ae89260..0ae7bbe
> > > >> 100644
> > > >> --- a/arch/arm64/boot/dts/renesas/r8a77990.dtsi
> > > >> +++ b/arch/arm64/boot/dts/renesas/r8a77990.dtsi
> > > >> @@ -337,6 +337,85 @@
> > > >>
> > > >>  			status = "disabled";
> > > >>
> > > >>  		};
> > > >>
> > > >> +		csi40: csi2@feaa0000 {
> > > >
> > > > I believe Simon would like to keep the nodes sorted by address
> > > >
> > > >> +			compatible = "renesas,r8a77990-csi2", "renesas,rcar-gen3-csi2";
> > > >> +			reg = <0 0xfeaa0000 0 0x10000>;
> > > >
> > > > 0x10000 seems pretty large to me.
> > >
> > > It seems to me that all Gen3 SoC have this lenght specified
> > >
> > > $git grep -A 10 'csi[2|4][0|1]: csi' arch/arm64/boot/dts/renesas/ | grep reg
> > > arch/arm64/boot/dts/renesas/r8a7795.dtsi-    reg = <0 0xfea80000 0 0x10000>;
> > > arch/arm64/boot/dts/renesas/r8a7795.dtsi-    reg = <0 0xfeaa0000 0 0x10000>;
> > > arch/arm64/boot/dts/renesas/r8a7795.dtsi-    reg = <0 0xfeab0000 0 0x10000>;
> > > arch/arm64/boot/dts/renesas/r8a7796.dtsi-    reg = <0 0xfea80000 0 0x10000>;
> > > arch/arm64/boot/dts/renesas/r8a7796.dtsi-    reg = <0 0xfeaa0000 0 0x10000>;
> > > arch/arm64/boot/dts/renesas/r8a77965.dtsi-   reg = <0 0xfea80000 0 0x10000>;
> > > arch/arm64/boot/dts/renesas/r8a77965.dtsi-   reg = <0 0xfeaa0000 0 0x10000>;
> > > arch/arm64/boot/dts/renesas/r8a77970.dtsi-   reg = <0 0xfeaa0000 0 0x10000>;
> > > arch/arm64/boot/dts/renesas/r8a77980.dtsi-   reg = <0 0xfeaa0000 0 0x10000>;
> > > arch/arm64/boot/dts/renesas/r8a77980.dtsi-   reg = <0 0xfeab0000 0 0x10000>;
> > > arch/arm64/boot/dts/renesas/r8a77990.dtsi-   reg = <0 0xfeaa0000 0 0x10000>;
> > >
> > > Am I missing something?
> >
> > Cargo-cult programming ? :-) This will likely not hurt, but such a large
> > memory area is not required, and we'll save a bit of memory if we reduce the
> > mapping from 64kB to 4kB (or less)
>
> Can we please update this patch, and existing dtsi files,
> to use an appropriately small register window?
>

What if we keep this one as it is and we change all the DTSIs in one
go?

> >
> > > > Apart from that,
> > >
> > > I will include the upporting of the following patch to fix the VIN
> > > endpoint numbering in forthcoming v3:
> > > https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas-bsp.git/commit
> > > /?id=1b1b73f7558d867d72e198901b84bec1e6ef1405
> > >
> > > As this has already been applied to simon's tree.
> > >
> > > > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > > >
> > > >> +			interrupts = <GIC_SPI 246 IRQ_TYPE_LEVEL_HIGH>;
> > > >> +			clocks = <&cpg CPG_MOD 716>;
> > > >> +			power-domains = <&sysc R8A77990_PD_ALWAYS_ON>;
> > > >> +			resets = <&cpg 716>;
> > > >> +			status = "disabled";
> > > >> +
> > > >> +			ports {
> > > >> +				#address-cells = <1>;
> > > >> +				#size-cells = <0>;
> > > >> +
> > > >> +				port@1 {
> > > >> +					#address-cells = <1>;
> > > >> +					#size-cells = <0>;
> > > >> +
> > > >> +					reg = <1>;
> > > >> +
> > > >> +					csi40vin4: endpoint@0 {
> > > >> +						reg = <0>;
> > > >> +						remote-endpoint = <&vin4csi40>;
> > > >> +					};
> > > >> +					csi40vin5: endpoint@1 {
> > > >> +						reg = <1>;
> > > >> +						remote-endpoint = <&vin5csi40>;
> > > >> +					};
> > > >> +				};
> > > >> +			};
> > > >> +		};
> > > >> +
> > > >> +		vin4: video@e6ef4000 {
> > > >> +			compatible = "renesas,vin-r8a77990";
> > > >> +			reg = <0 0xe6ef4000 0 0x1000>;
> > > >> +			interrupts = <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
> > > >> +			clocks = <&cpg CPG_MOD 807>;
> > > >> +			power-domains = <&sysc R8A77990_PD_ALWAYS_ON>;
> > > >> +			resets = <&cpg 807>;
> > > >> +			renesas,id = <4>;
> > > >> +			status = "disabled";
> > > >> +
> > > >> +			ports {
> > > >> +				#address-cells = <1>;
> > > >> +				#size-cells = <0>;
> > > >> +
> > > >> +				port@1 {
> > > >> +					reg = <1>;
> > > >> +
> > > >> +					vin4csi40: endpoint {
> > > >> +						remote-endpoint= <&csi40vin4>;
> > > >> +					};
> > > >> +				};
> > > >> +			};
> > > >> +		};
> > > >> +
> > > >> +		vin5: video@e6ef5000 {
> > > >> +			compatible = "renesas,vin-r8a77990";
> > > >> +			reg = <0 0xe6ef5000 0 0x1000>;
> > > >> +			interrupts = <GIC_SPI 175 IRQ_TYPE_LEVEL_HIGH>;
> > > >> +			clocks = <&cpg CPG_MOD 806>;
> > > >> +			power-domains = <&sysc R8A77990_PD_ALWAYS_ON>;
> > > >> +			resets = <&cpg 806>;
> > > >> +			renesas,id = <5>;
> > > >> +			status = "disabled";
> > > >> +
> > > >> +			ports {
> > > >> +				#address-cells = <1>;
> > > >> +				#size-cells = <0>;
> > > >> +
> > > >> +				port@1 {
> > > >> +					reg = <1>;
> > > >> +
> > > >> +					vin5csi40: endpoint {
> > > >> +						remote-endpoint= <&csi40vin5>;
> > > >> +					};
> > > >> +				};
> > > >> +			};
> > > >> +		};
> > > >> +
> > > >>  		scif2: serial@e6e88000 {
> > > >>  			compatible = "renesas,scif-r8a77990",
> > > >>  				     "renesas,rcar-gen3-scif", "renesas,scif";
> >
> > --
> > Regards,
> >
> > Laurent Pinchart
> >
> >
> >

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