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Message-ID: <20201016155546.GB1474949@bogus>
Date: Fri, 16 Oct 2020 10:55:46 -0500
From: Rob Herring <robh@...nel.org>
To: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Ramesh Shanmugasundaram <rashanmu@...il.com>,
linux-media@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
Chris Paterson <Chris.Paterson2@...esas.com>,
Biju Das <biju.das.jz@...renesas.com>,
Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v4 2/5] media: dt-bindings: media: renesas,drif: Convert
to json-schema
On Wed, Oct 14, 2020 at 04:57:16PM +0100, Fabrizio Castro wrote:
> Convert the Renesas DRIF bindings to DT schema and update
> MAINTAINERS accordingly.
>
> Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> v3->v4:
> * Replace "if" statement with "else" statement for the branch
> rejecting pinctrl-0 and pinctrl-names properties, as suggested
> by Geert
> v2->v3:
> * Removed the definition of pinctrl-0 and pinctrl-names, as
> suggested by Geert
> * Added "power-domains" to the list of required properties,
> as suggested by Geert
> v1->v2:
> * s/controller/Controller/ in the title of renesas,drif.yaml
> as suggested by Laurent.
>
> .../bindings/media/renesas,drif.txt | 177 -----------
> .../bindings/media/renesas,drif.yaml | 277 ++++++++++++++++++
> MAINTAINERS | 2 +-
> 3 files changed, 278 insertions(+), 178 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/media/renesas,drif.txt
> create mode 100644 Documentation/devicetree/bindings/media/renesas,drif.yaml
>
> diff --git a/Documentation/devicetree/bindings/media/renesas,drif.txt b/Documentation/devicetree/bindings/media/renesas,drif.txt
> deleted file mode 100644
> index 0d8974aa8b38..000000000000
> --- a/Documentation/devicetree/bindings/media/renesas,drif.txt
> +++ /dev/null
> @@ -1,177 +0,0 @@
> -Renesas R-Car Gen3 Digital Radio Interface controller (DRIF)
> -------------------------------------------------------------
> -
> -R-Car Gen3 DRIF is a SPI like receive only slave device. A general
> -representation of DRIF interfacing with a master device is shown below.
> -
> -+---------------------+ +---------------------+
> -| |-----SCK------->|CLK |
> -| Master |-----SS-------->|SYNC DRIFn (slave) |
> -| |-----SD0------->|D0 |
> -| |-----SD1------->|D1 |
> -+---------------------+ +---------------------+
> -
> -As per datasheet, each DRIF channel (drifn) is made up of two internal
> -channels (drifn0 & drifn1). These two internal channels share the common
> -CLK & SYNC. Each internal channel has its own dedicated resources like
> -irq, dma channels, address space & clock. This internal split is not
> -visible to the external master device.
> -
> -The device tree model represents each internal channel as a separate node.
> -The internal channels sharing the CLK & SYNC are tied together by their
> -phandles using a property called "renesas,bonding". For the rest of
> -the documentation, unless explicitly stated, the word channel implies an
> -internal channel.
> -
> -When both internal channels are enabled they need to be managed together
> -as one (i.e.) they cannot operate alone as independent devices. Out of the
> -two, one of them needs to act as a primary device that accepts common
> -properties of both the internal channels. This channel is identified by a
> -property called "renesas,primary-bond".
> -
> -To summarize,
> - - When both the internal channels that are bonded together are enabled,
> - the zeroth channel is selected as primary-bond. This channels accepts
> - properties common to all the members of the bond.
> - - When only one of the bonded channels need to be enabled, the property
> - "renesas,bonding" or "renesas,primary-bond" will have no effect. That
> - enabled channel can act alone as any other independent device.
> -
> -Required properties of an internal channel:
> --------------------------------------------
> -- compatible: "renesas,r8a7795-drif" if DRIF controller is a part of R8A7795 SoC.
> - "renesas,r8a7796-drif" if DRIF controller is a part of R8A7796 SoC.
> - "renesas,rcar-gen3-drif" for a generic R-Car Gen3 compatible device.
> -
> - When compatible with the generic version, nodes must list the
> - SoC-specific version corresponding to the platform first
> - followed by the generic version.
> -
> -- reg: offset and length of that channel.
> -- interrupts: associated with that channel.
> -- clocks: phandle and clock specifier of that channel.
> -- clock-names: clock input name string: "fck".
> -- dmas: phandles to the DMA channels.
> -- dma-names: names of the DMA channel: "rx".
> -- renesas,bonding: phandle to the other channel.
> -
> -Optional properties of an internal channel:
> --------------------------------------------
> -- power-domains: phandle to the respective power domain.
> -
> -Required properties of an internal channel when:
> - - It is the only enabled channel of the bond (or)
> - - If it acts as primary among enabled bonds
> ---------------------------------------------------------
> -- pinctrl-0: pin control group to be used for this channel.
> -- pinctrl-names: must be "default".
> -- renesas,primary-bond: empty property indicating the channel acts as primary
> - among the bonded channels.
> -- port: child port node corresponding to the data input, in accordance with
> - the video interface bindings defined in
> - Documentation/devicetree/bindings/media/video-interfaces.txt. The port
> - node must contain at least one endpoint.
> -
> -Optional endpoint property:
> ----------------------------
> -- sync-active: Indicates sync signal polarity, 0/1 for low/high respectively.
> - This property maps to SYNCAC bit in the hardware manual. The
> - default is 1 (active high).
> -
> -Example:
> ---------
> -
> -(1) Both internal channels enabled:
> ------------------------------------
> -
> -When interfacing with a third party tuner device with two data pins as shown
> -below.
> -
> -+---------------------+ +---------------------+
> -| |-----SCK------->|CLK |
> -| Master |-----SS-------->|SYNC DRIFn (slave) |
> -| |-----SD0------->|D0 |
> -| |-----SD1------->|D1 |
> -+---------------------+ +---------------------+
> -
> - drif00: rif@...40000 {
> - compatible = "renesas,r8a7795-drif",
> - "renesas,rcar-gen3-drif";
> - reg = <0 0xe6f40000 0 0x64>;
> - interrupts = <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>;
> - clocks = <&cpg CPG_MOD 515>;
> - clock-names = "fck";
> - dmas = <&dmac1 0x20>, <&dmac2 0x20>;
> - dma-names = "rx", "rx";
> - power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
> - renesas,bonding = <&drif01>;
> - renesas,primary-bond;
> - pinctrl-0 = <&drif0_pins>;
> - pinctrl-names = "default";
> - port {
> - drif0_ep: endpoint {
> - remote-endpoint = <&tuner_ep>;
> - };
> - };
> - };
> -
> - drif01: rif@...50000 {
> - compatible = "renesas,r8a7795-drif",
> - "renesas,rcar-gen3-drif";
> - reg = <0 0xe6f50000 0 0x64>;
> - interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
> - clocks = <&cpg CPG_MOD 514>;
> - clock-names = "fck";
> - dmas = <&dmac1 0x22>, <&dmac2 0x22>;
> - dma-names = "rx", "rx";
> - power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
> - renesas,bonding = <&drif00>;
> - };
> -
> -
> -(2) Internal channel 1 alone is enabled:
> -----------------------------------------
> -
> -When interfacing with a third party tuner device with one data pin as shown
> -below.
> -
> -+---------------------+ +---------------------+
> -| |-----SCK------->|CLK |
> -| Master |-----SS-------->|SYNC DRIFn (slave) |
> -| | |D0 (unused) |
> -| |-----SD-------->|D1 |
> -+---------------------+ +---------------------+
> -
> - drif00: rif@...40000 {
> - compatible = "renesas,r8a7795-drif",
> - "renesas,rcar-gen3-drif";
> - reg = <0 0xe6f40000 0 0x64>;
> - interrupts = <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>;
> - clocks = <&cpg CPG_MOD 515>;
> - clock-names = "fck";
> - dmas = <&dmac1 0x20>, <&dmac2 0x20>;
> - dma-names = "rx", "rx";
> - power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
> - renesas,bonding = <&drif01>;
> - };
> -
> - drif01: rif@...50000 {
> - compatible = "renesas,r8a7795-drif",
> - "renesas,rcar-gen3-drif";
> - reg = <0 0xe6f50000 0 0x64>;
> - interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
> - clocks = <&cpg CPG_MOD 514>;
> - clock-names = "fck";
> - dmas = <&dmac1 0x22>, <&dmac2 0x22>;
> - dma-names = "rx", "rx";
> - power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
> - renesas,bonding = <&drif00>;
> - pinctrl-0 = <&drif0_pins>;
> - pinctrl-names = "default";
> - port {
> - drif0_ep: endpoint {
> - remote-endpoint = <&tuner_ep>;
> - sync-active = <0>;
> - };
> - };
> - };
> diff --git a/Documentation/devicetree/bindings/media/renesas,drif.yaml b/Documentation/devicetree/bindings/media/renesas,drif.yaml
> new file mode 100644
> index 000000000000..3832ce837553
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/renesas,drif.yaml
> @@ -0,0 +1,277 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/renesas,drif.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas R-Car Gen3 Digital Radio Interface Controller (DRIF)
> +
> +maintainers:
> + - Ramesh Shanmugasundaram <rashanmu@...il.com>
> + - Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> +
> +description: |
> + R-Car Gen3 DRIF is a SPI like receive only slave device. A general
> + representation of DRIF interfacing with a master device is shown below.
> +
> + +---------------------+ +---------------------+
> + | |-----SCK------->|CLK |
> + | Master |-----SS-------->|SYNC DRIFn (slave) |
> + | |-----SD0------->|D0 |
> + | |-----SD1------->|D1 |
> + +---------------------+ +---------------------+
> +
> + As per datasheet, each DRIF channel (drifn) is made up of two internal
> + channels (drifn0 & drifn1). These two internal channels share the common
> + CLK & SYNC. Each internal channel has its own dedicated resources like
> + irq, dma channels, address space & clock. This internal split is not
> + visible to the external master device.
> +
> + The device tree model represents each internal channel as a separate node.
> + The internal channels sharing the CLK & SYNC are tied together by their
> + phandles using a property called "renesas,bonding". For the rest of
> + the documentation, unless explicitly stated, the word channel implies an
> + internal channel.
> +
> + When both internal channels are enabled they need to be managed together
> + as one (i.e.) they cannot operate alone as independent devices. Out of the
> + two, one of them needs to act as a primary device that accepts common
> + properties of both the internal channels. This channel is identified by a
> + property called "renesas,primary-bond".
> +
> + To summarize,
> + * When both the internal channels that are bonded together are enabled,
> + the zeroth channel is selected as primary-bond. This channels accepts
> + properties common to all the members of the bond.
> + * When only one of the bonded channels need to be enabled, the property
> + "renesas,bonding" or "renesas,primary-bond" will have no effect. That
> + enabled channel can act alone as any other independent device.
> +
> +properties:
> + compatible:
> + items:
> + - enum:
> + - renesas,r8a7795-drif # R-Car H3
> + - renesas,r8a7796-drif # R-Car M3-W
Note the bot error is from yamllint which just got added to the checks.
Need 2 more spaces indent here.
With that,
Reviewed-by: Rob Herring <robh@...nel.org>
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