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References: <20210621072424.111733-1-jagan@amarulasolutions.com> <20210621072424.111733-9-jagan@amarulasolutions.com>
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From:   Adam Ford <aford173@gmail.com>
Date:   Mon, 21 Jun 2021 22:02:50 -0500
Message-ID: <CAHCN7xKNarHo6DaAN-J=QLAsfTXOvChOuLR68h6CPgRe-q+rmA@mail.gmail.com>
Subject: Re: [RFC PATCH 8/9] arm64: dts: imx8mm: Add MIPI DSI pipeline
To:     Jagan Teki <jagan@amarulasolutions.com>
Cc:     Peng Fan <peng.fan@nxp.com>, Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Tomasz Figa <t.figa@samsung.com>,
        Fancy Fang <chen.fang@nxp.com>,
        devicetree <devicetree@vger.kernel.org>,
        Francis Laniel <francis.laniel@amarulasolutions.com>,
        Matteo Lisi <matteo.lisi@engicam.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        Rob Herring <robh+dt@kernel.org>,
        NXP Linux Team <linux-imx@nxp.com>,
        Milco Pratesi <milco.pratesi@engicam.com>,
        Anthony Brandon <anthony@amarulasolutions.com>,
        linux-phy@lists.infradead.org, linux-amarula@amarulasolutions.com,
        arm-soc <linux-arm-kernel@lists.infradead.org>
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On Mon, Jun 21, 2021 at 2:25 AM Jagan Teki <jagan@amarulasolutions.com> wrote:
>
> Add MIPI DSI pipeline for i.MX8MM.
>
> Video pipeline start from eLCDIF to MIPI DSI and respective
> Panel or Bridge on the backend side.
>
> Add support for it.
>
> Cc: Rob Herring <robh+dt@kernel.org>
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
>  arch/arm64/boot/dts/freescale/imx8mm.dtsi | 59 +++++++++++++++++++++++
>  1 file changed, 59 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> index 5f68182ed3a6..bc09fce0f6a9 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> @@ -1047,6 +1047,65 @@ lcdif: lcdif@32e00000 {
>                                 interrupts = <GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>;
>                                 power-domains = <&dispmix_blk_ctl IMX8MM_BLK_CTL_PD_DISPMIX_LCDIF>;
>                                 status = "disabled";
> +
> +                               port {
> +                                       lcdif_out_dsi: endpoint {
> +                                               remote-endpoint = <&dsi_in_lcdif>;
> +                                       };
> +                               };
> +                       };
> +
> +                       dsi: dsi@32e10000 {
> +                               compatible = "fsl,imx8mm-sec-dsim";
> +                               reg = <0x32e10000 0xa0>;
> +                               clocks = <&clk IMX8MM_CLK_DSI_CORE>,
> +                                        <&clk IMX8MM_CLK_DSI_PHY_REF>;
> +                               clock-names = "bus", "phy_ref";
> +                               assigned-clocks = <&clk IMX8MM_CLK_DSI_CORE>,
> +                                                 <&clk IMX8MM_VIDEO_PLL1_OUT>,
> +                                                 <&clk IMX8MM_CLK_DSI_PHY_REF>;
> +                               assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_266M>,
> +                                                        <&clk IMX8MM_VIDEO_PLL1_BYPASS>,
> +                                                        <&clk IMX8MM_VIDEO_PLL1_OUT>;
> +                               assigned-clock-rates = <266000000>, <594000000>, <27000000>;
> +                               interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>;
> +                               phys = <&dphy>;
> +                               phy-names = "dphy";
> +                               power-domains = <&dispmix_blk_ctl IMX8MM_BLK_CTL_PD_DISPMIX_MIPI_DSI>;
> +                               samsung,burst-clock-frequency = <891000000>;
> +                               samsung,esc-clock-frequency = <54000000>;
> +                               samsung,pll-clock-frequency = <27000000>;
> +                               status = "disabled";
> +
> +                               ports {
> +                                       #address-cells = <1>;
> +                                       #size-cells = <0>;
> +
> +                                       port@0 {
> +                                               reg = <0>;
> +                                               #address-cells = <1>;
> +                                               #size-cells = <0>;
> +
> +                                               dsi_in_lcdif: endpoint@0 {
> +                                                       reg = <0>;

When I build this with W=1, I get a warning:

Warning (graph_child_address):
/soc@0/bus@32c00000/dsi@32e10000/ports/port@0: graph node has single
child node 'endpoint@0', #address-cells/#size-cells are not necessary

Are there supposed to be two endpoints for port@0?

> +                                                       remote-endpoint = <&lcdif_out_dsi>;
> +                                               };
> +                                       };
> +
> +                                       port@1 {
> +                                               reg = <1>;
> +                                       };
> +                               };
> +                       };
> +
> +                       dphy: dphy@32e100a4 {
> +                               compatible = "fsl,imx8mm-sec-dsim-dphy";
> +                               reg = <0x32e100a4 0xbc>;
> +                               clocks = <&clk IMX8MM_CLK_DSI_PHY_REF>;
> +                               clock-names = "phy_ref";
> +                               #phy-cells = <0>;
> +                               power-domains = <&dispmix_blk_ctl IMX8MM_BLK_CTL_PD_DISPMIX_MIPI_DPHY>;
> +                               status = "disabled";
>                         };
>
>                         dispmix_blk_ctl: blk-ctl@32e28000 {
> --
> 2.25.1
>