linux-kernel - Re: [PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

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Date:   Fri, 12 Jul 2019 15:10:28 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Andrew Jeffery <andrew@...id.au>
Cc:     linux-mmc@...r.kernel.org, ulf.hansson@...aro.org,
        robh+dt@...nel.org, mark.rutland@....com, joel@....id.au,
        adrian.hunter@...el.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        ryanchen.aspeed@...il.com
Subject: Re: [PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

Hi,

On Fri, Jul 12, 2019 at 01:02:13PM +0930, Andrew Jeffery wrote:
> The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the
> SDIO Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit
> data bus if only a single slot is enabled.
>
> Signed-off-by: Andrew Jeffery <andrew@...id.au>
> ---
> In v2:
>
> * Rename to aspeed,sdhci.yaml
> * Rename sd-controller compatible
> * Add `maxItems: 1` for reg properties
> * Move sdhci subnode description to patternProperties
> * Drop sdhci compatible requirement
> * #address-cells and #size-cells are required
> * Prevent additional properties
> * Implement explicit ranges in example
> * Remove slot property
>
>  .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 90 +++++++++++++++++++
>  1 file changed, 90 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
>
> diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> new file mode 100644
> index 000000000000..67a691c3348c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> @@ -0,0 +1,90 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mmc/aspeed,sdhci.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ASPEED SD/SDIO/eMMC Controller
> +
> +maintainers:
> +  - Andrew Jeffery <andrew@...id.au>
> +  - Ryan Chen <ryanchen.aspeed@...il.com>
> +
> +description: |+
> +  The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the SDIO
> +  Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit data bus if
> +  only a single slot is enabled.
> +
> +  The two slots are supported by a common configuration area. As the SDHCIs for
> +  the slots are dependent on the common configuration area, they are described
> +  as child nodes.
> +
> +properties:
> +  compatible:
> +    enum: [ aspeed,ast2400-sd-controller, aspeed,ast2500-sd-controller ]
> +  reg:
> +    maxItems: 1
> +    description: Common configuration registers
> +  ranges: true
> +  clocks:
> +    maxItems: 1
> +    description: The SD/SDIO controller clock gate

#address-cells and #size-cells have not been described here.

> +patternProperties:
> +  "^sdhci@[0-9a-f]+$":
> +    type: object
> +    properties:
> +      compatible:
> +        enum: [ aspeed,ast2400-sdhci, aspeed,ast2500-sdhci ]
> +      reg:
> +        maxItems: 1
> +        description: The SDHCI registers
> +      clocks:
> +        maxItems: 1
> +        description: The SD bus clock
> +      interrupts:
> +        maxItems: 1
> +        description: The SD interrupt shared between both slots
> +    required:
> +      - compatible
> +      - reg
> +      - clocks
> +      - interrupts
> +
> +additionalProperties: false

But that means that it will generate a warning in your DT if you ever
use them.

> +required:
> +  - compatible
> +  - reg
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ranges
> +  - clocks
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/aspeed-clock.h>
> +    sdc@...40000 {
> +            compatible = "aspeed,ast2500-sd-controller";
> +            reg = <0x1e740000 0x100>;
> +            #address-cells = <1>;
> +            #size-cells = <1>;

Starting with your example.

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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