Re: [PATCH 2/3] media: dt-bindings: media: renesas,drif: Convert to json-schema

From: Laurent Pinchart
Date: Tue Sep 15 2020 - 14:00:07 EST

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On Tue, Sep 15, 2020 at 08:36:39PM +0300, Laurent Pinchart wrote:
> Hi Fabrizio,
>
> Thank you for the patch.
>
> On Tue, Sep 15, 2020 at 02:12:15PM +0100, Fabrizio Castro wrote:
> > Convert the Renesas DRIF bindings to DT schema and update
> > MAINTAINERS accordingly.
> >
> > Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@xxxxxxxxxxx>
> > ---
> > .../bindings/media/renesas,drif.txt | 177 ------------
> > .../bindings/media/renesas,drif.yaml | 270 ++++++++++++++++++
> > MAINTAINERS | 2 +-
> > 3 files changed, 271 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@e6f40000 {
> > - 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@e6f50000 {
> > - 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@e6f40000 {
> > - 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@e6f50000 {
> > - 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..f57fccc159d6
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/renesas,drif.yaml
> > @@ -0,0 +1,270 @@
> > +# 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)
>
> s/controller/Controller/
>
> > +
> > +maintainers:
> > + - Ramesh Shanmugasundaram <rashanmu@xxxxxxxxx>
> > + - Fabrizio Castro <fabrizio.castro.jz@xxxxxxxxxxx>
> > +
> > +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
> > + - const: renesas,rcar-gen3-drif # Generic R-Car Gen3 compatible device
> > +
> > + reg:
> > + maxItems: 1
> > +
> > + interrupts:
> > + maxItems: 1
> > +
> > + clocks:
> > + maxItems: 1
> > +
> > + clock-names:
> > + maxItems: 1
> > + items:
> > + - const: fck
> > +
> > + resets:
> > + maxItems: 1
> > +
> > + dmas:
> > + minItems: 1
> > + maxItems: 2
> > +
> > + dma-names:
> > + minItems: 1
> > + maxItems: 2
> > + items:
> > + - const: rx
> > + - const: rx
> > +
> > + renesas,bonding:
> > + $ref: /schemas/types.yaml#/definitions/phandle
> > + description:
> > + The phandle to the other internal channel of DRIF
> > +
> > + power-domains:
> > + maxItems: 1
> > +
> > + pinctrl-0:
> > + maxItems: 1
> > +
> > + pinctrl-names:
> > + maxItems: 1
> > + items:
> > + - const: default
>
> You can drop those three properties, they're already handled by
> dt-schema.

It looks like I'm wrong, power-domains seems to be required. I'm not
sure why though, as the power-domain-consumer.yaml schema has select:
true. Maybe Rob can comment on this, in the meantime let's keep the
power-domains property.

> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
>
> > +
> > + renesas,primary-bond:
> > + type: boolean
> > + description:
> > + Indicates that the channel acts as primary among the bonded channels.
> > +
> > + port:
> > + type: object
> > + description:
> > + 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.
> > +
> > + properties:
> > + endpoint:
> > + type: object
> > +
> > + properties:
> > + remote-endpoint:
> > + description:
> > + A phandle to the remote tuner endpoint subnode in remote node
> > + port.
> > +
> > + sync-active:
> > + enum: [0, 1]
> > + description:
> > + 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).
> > +
> > + additionalProperties: false
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - interrupts
> > + - clocks
> > + - clock-names
> > + - resets
> > + - dmas
> > + - dma-names
> > + - renesas,bonding
> > +
> > +if:
> > + required:
> > + - renesas,primary-bond
> > +then:
> > + required:
> > + - pinctrl-0
> > + - pinctrl-names
> > + - port
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + # Example with 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 |
> > + # +---------------------+ +---------------------+
> > + - |
> > + #include <dt-bindings/clock/r8a7795-cpg-mssr.h>
> > + #include <dt-bindings/interrupt-controller/arm-gic.h>
> > + #include <dt-bindings/power/r8a7795-sysc.h>
> > +
> > + soc {
> > + #address-cells = <2>;
> > + #size-cells = <2>;
> > +
> > + drif00: rif@e6f40000 {
> > + 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>;
> > + resets = <&cpg 515>;
> > + renesas,primary-bond;
> > + pinctrl-0 = <&drif0_pins>;
> > + pinctrl-names = "default";
> > + port {
> > + drif0_ep: endpoint {
> > + remote-endpoint = <&tuner_ep>;
> > + };
> > + };
> > + };
> > +
> > + drif01: rif@e6f50000 {
> > + 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>;
> > + resets = <&cpg 514>;
> > + };
> > + };
> > +
> > + # Example with internal channel 1 alone 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 |
> > + # +---------------------+ +---------------------+
> > + - |
> > + #include <dt-bindings/clock/r8a7795-cpg-mssr.h>
> > + #include <dt-bindings/interrupt-controller/arm-gic.h>
> > + #include <dt-bindings/power/r8a7795-sysc.h>
> > +
> > + soc {
> > + #address-cells = <2>;
> > + #size-cells = <2>;
> > +
> > + drif10: rif@e6f60000 {
> > + compatible = "renesas,r8a7795-drif",
> > + "renesas,rcar-gen3-drif";
> > + reg = <0 0xe6f60000 0 0x64>;
> > + interrupts = <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>;
> > + clocks = <&cpg CPG_MOD 513>;
> > + clock-names = "fck";
> > + dmas = <&dmac1 0x24>, <&dmac2 0x24>;
> > + dma-names = "rx", "rx";
> > + power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
> > + resets = <&cpg 513>;
> > + renesas,bonding = <&drif11>;
> > + };
> > +
> > + drif11: rif@e6f70000 {
> > + compatible = "renesas,r8a7795-drif",
> > + "renesas,rcar-gen3-drif";
> > + reg = <0 0xe6f70000 0 0x64>;
> > + interrupts = <GIC_SPI 15 IRQ_TYPE_LEVEL_HIGH>;
> > + clocks = <&cpg CPG_MOD 512>;
> > + clock-names = "fck";
> > + dmas = <&dmac1 0x26>, <&dmac2 0x26>;
> > + dma-names = "rx", "rx";
> > + power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
> > + resets = <&cpg 512>;
> > + renesas,bonding = <&drif10>;
> > + pinctrl-0 = <&drif1_pins>;
> > + pinctrl-names = "default";
> > + port {
> > + drif1_ep: endpoint {
> > + remote-endpoint = <&tuner_ep1>;
> > + sync-active = <0>;
> > + };
> > + };
> > + };
> > + };
> > +...
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 9f49e5ac90d8..3e2a1cad3749 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -10903,7 +10903,7 @@ L: linux-media@xxxxxxxxxxxxxxx
> > L: linux-renesas-soc@xxxxxxxxxxxxxxx
> > S: Supported
> > T: git git://linuxtv.org/media_tree.git
> > -F: Documentation/devicetree/bindings/media/renesas,drif.txt
> > +F: Documentation/devicetree/bindings/media/renesas,drif.yaml
> > F: drivers/media/platform/rcar_drif.c
> >
> > MEDIA DRIVERS FOR RENESAS - FCP

--
Regards,

Laurent Pinchart

Next message: Lad Prabhakar: "[PATCH v5 3/3] media: i2c: ov772x: Add test pattern control"
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In reply to: Laurent Pinchart: "Re: [PATCH 2/3] media: dt-bindings: media: renesas,drif: Convert to json-schema"
Next in thread: Fabrizio Castro: "[PATCH 1/3] MAINTAINERS: Add Fabrizio Castro to Renesas DRIF"
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