linux-kernel - Re: [PATCH 09/22] ARM: dts: sun8i: v3s: Add nodes for MIPI CSI-2 support

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Message-ID: <YT8BVo61qL1jq/er@aptenodytes>
Date:   Mon, 13 Sep 2021 09:44:22 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Helen Koike <helen.koike@...labora.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-clk@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: Re: [PATCH 09/22] ARM: dts: sun8i: v3s: Add nodes for MIPI CSI-2
 support

Hi Samuel,

On Fri 10 Sep 21, 21:32, Samuel Holland wrote:
> On 9/10/21 1:41 PM, Paul Kocialkowski wrote:
> > MIPI CSI-2 is supported on the V3s with an A31-based MIPI CSI-2 bridge
> > controller. The controller uses a separate D-PHY, which is the same
> > that is otherwise used for MIPI DSI, but used in Rx mode.
> > 
> > On the V3s, the CSI0 controller is dedicated to MIPI CSI-2 as it does
> > not have access to any parallel interface pins.
> > 
> > Add all the necessary nodes (CSI0, MIPI CSI-2 bridge and D-PHY) to
> > support the MIPI CSI-2 interface.
> > 
> > Note that a fwnode graph link is created between CSI0 and MIPI CSI-2
> > even when no sensor is connected. This will result in a probe failure
> > for the controller as long as no sensor is connected but this is fine
> > since no other interface is available.
> > 
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > ---
> >  arch/arm/boot/dts/sun8i-v3s.dtsi | 72 ++++++++++++++++++++++++++++++++
> >  1 file changed, 72 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/sun8i-v3s.dtsi b/arch/arm/boot/dts/sun8i-v3s.dtsi
> > index a77b63362a1d..ec7fa6459547 100644
> > --- a/arch/arm/boot/dts/sun8i-v3s.dtsi
> > +++ b/arch/arm/boot/dts/sun8i-v3s.dtsi
> > @@ -612,6 +612,34 @@ spi0: spi@...8000 {
> >  			#size-cells = <0>;
> >  		};
> >  
> > +		csi0: camera@...0000 {
> > +			compatible = "allwinner,sun8i-v3s-csi";
> > +			reg = <0x01cb0000 0x1000>;
> > +			interrupts = <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>;
> > +			clocks = <&ccu CLK_BUS_CSI>,
> > +				 <&ccu CLK_CSI1_SCLK>,
> > +				 <&ccu CLK_DRAM_CSI>;
> > +			clock-names = "bus", "mod", "ram";
> > +			resets = <&ccu RST_BUS_CSI>;
> > +			status = "disabled";
> > +
> > +			assigned-clocks = <&ccu CLK_CSI1_SCLK>;
> > +			assigned-clock-parents = <&ccu CLK_PLL_ISP>;
> > +
> > +			ports {
> > +				#address-cells = <1>;
> > +				#size-cells = <0>;
> > +
> > +				port@1 {
> > +					reg = <1>;
> > +
> > +					csi0_in_mipi_csi2: endpoint {
> > +						remote-endpoint = <&mipi_csi2_out_csi0>;
> > +					};
> > +				};
> > +			};
> > +		};
> > +
> >  		csi1: camera@...4000 {
> >  			compatible = "allwinner,sun8i-v3s-csi";
> >  			reg = <0x01cb4000 0x3000>;
> 
> All of the new nodes should be added above this one, to maintain unit
> address order.

Good catch, this was an overlook on my side.

Thanks,

Paul

> Regards,
> Samuel
> 
> > @@ -637,5 +665,49 @@ gic: interrupt-controller@...1000 {
> >  			#interrupt-cells = <3>;
> >  			interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
> >  		};
> > +
> > +		mipi_csi2: csi@...1000 {
> > +			compatible = "allwinner,sun8i-v3s-mipi-csi2",
> > +				     "allwinner,sun6i-a31-mipi-csi2";
> > +			reg = <0x01cb1000 0x1000>;
> > +			interrupts = <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>;
> > +			clocks = <&ccu CLK_BUS_CSI>,
> > +				 <&ccu CLK_CSI1_SCLK>;
> > +			clock-names = "bus", "mod";
> > +			resets = <&ccu RST_BUS_CSI>;
> > +			status = "disabled";
> > +
> > +			phys = <&dphy>;
> > +			phy-names = "dphy";
> > +
> > +			ports {
> > +				#address-cells = <1>;
> > +				#size-cells = <0>;
> > +
> > +				mipi_csi2_in: port@0 {
> > +					reg = <0>;
> > +				};
> > +
> > +				mipi_csi2_out: port@1 {
> > +					reg = <1>;
> > +
> > +					mipi_csi2_out_csi0: endpoint {
> > +						remote-endpoint = <&csi0_in_mipi_csi2>;
> > +					};
> > +				};
> > +			};
> > +		};
> > +
> > +		dphy: d-phy@...2000 {
> > +			compatible = "allwinner,sun6i-a31-mipi-dphy";
> > +			reg = <0x01cb2000 0x1000>;
> > +			clocks = <&ccu CLK_BUS_CSI>,
> > +				 <&ccu CLK_MIPI_CSI>;
> > +			clock-names = "bus", "mod";
> > +			resets = <&ccu RST_BUS_CSI>;
> > +			allwinner,direction = "rx";
> > +			status = "disabled";
> > +			#phy-cells = <0>;
> > +		};
> >  	};
> >  };
> > 
> 

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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