linux-kernel - Re: [PATCH v3 06/19] dt-bindings: display: imx: Add i.MX8qxp Display Controller command sequencer

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Message-ID: <20240816223710.GA2394350-robh@kernel.org>
Date: Fri, 16 Aug 2024 16:37:10 -0600
From: Rob Herring <robh@...nel.org>
To: Liu Ying <victor.liu@....com>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
	p.zabel@...gutronix.de, airlied@...il.com, daniel@...ll.ch,
	maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
	tzimmermann@...e.de, krzk+dt@...nel.org, conor+dt@...nel.org,
	shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
	festevam@...il.com, tglx@...utronix.de, vkoul@...nel.org,
	kishon@...nel.org, aisheng.dong@....com, agx@...xcpu.org,
	francesco@...cini.it, frank.li@....com
Subject: Re: [PATCH v3 06/19] dt-bindings: display: imx: Add i.MX8qxp Display
 Controller command sequencer

On Wed, Jul 24, 2024 at 05:29:37PM +0800, Liu Ying wrote:
> i.MX8qxp Display Controller contains a command sequencer is designed to
> autonomously process command lists.
> 
> Signed-off-by: Liu Ying <victor.liu@....com>
> ---
> v3:
> * New patch. (Rob)
> 
>  .../imx/fsl,imx8qxp-dc-command-sequencer.yaml | 67 +++++++++++++++++++
>  1 file changed, 67 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-command-sequencer.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-command-sequencer.yaml b/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-command-sequencer.yaml
> new file mode 100644
> index 000000000000..2e0e8e40a185
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-command-sequencer.yaml
> @@ -0,0 +1,67 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/imx/fsl,imx8qxp-dc-command-sequencer.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale i.MX8qxp Display Controller Command Sequencer
> +
> +description: |
> +  The Command Sequencer is designed to autonomously process command lists.
> +  By that it can load setups into the DC configuration and synchronize to
> +  hardware events.  This releases a system's CPU from workload, because it
> +  does not need to wait for certain events.  Also it simplifies SW architecture,
> +  because no interrupt handlers are required.  Setups are read via AXI bus,
> +  while write access to configuration registers occurs directly via an internal
> +  bus.  This saves bandwidth for the AXI interconnect and improves the system
> +  architecture in terms of safety aspects.
> +
> +maintainers:
> +  - Liu Ying <victor.liu@....com>
> +
> +properties:
> +  compatible:
> +    const: fsl,imx8qxp-dc-command-sequencer
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 5
> +
> +  interrupt-names:
> +    items:
> +      - const: error
> +      - const: sw0
> +      - const: sw1
> +      - const: sw2
> +      - const: sw3
> +
> +  fsl,iram:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: phandle pointing to the mmio-sram device node

'sram' is the standard property for this.

> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - interrupts
> +  - interrupt-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx8-lpcg.h>
> +
> +    command-sequencer@...80400 {
> +        compatible = "fsl,imx8qxp-dc-command-sequencer";
> +        reg = <0x56180400 0x1a4>;
> +        clocks = <&dc0_lpcg IMX_LPCG_CLK_5>;
> +        interrupt-parent = <&dc0_intc>;
> +        interrupts = <36>, <37>, <38>, <39>, <40>;
> +        interrupt-names = "error", "sw0", "sw1", "sw2", "sw3";
> +    };
> -- 
> 2.34.1
>