linux-kernel - Re: [RFC PATCH v1 2/3] dt-bindings: mmc: convert synopsys dw-mshc bindings to yaml

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Date:   Thu, 16 Jan 2020 13:00:55 +0100
From:   Johan Jonker <jbx6244@...il.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        "heiko@...ech.de" <heiko@...ech.de>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>
Subject: Re: [RFC PATCH v1 2/3] dt-bindings: mmc: convert synopsys dw-mshc
 bindings to yaml

See below.

On 1/15/20 4:18 PM, Rob Herring wrote:
> On Tue, Jan 14, 2020 at 3:38 PM Johan Jonker <jbx6244@...il.com> wrote:
>>

> [...]
> 
>> diff --git a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.yaml b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.yaml
>> new file mode 100644
>> index 000000000..6f85a21d0
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.yaml
>> @@ -0,0 +1,88 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/mmc/synopsys-dw-mshc.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Synopsys Designware Mobile Storage Host Controller Binding

[..]

>> +examples:
>> +  # The MSHC controller node can be split into two portions, SoC specific and
>> +  # board specific portions as listed below.
> 


> This split doesn't work because the examples are built and validated
> now. It may happen to because all the props are optional, but the
> board hunk goes unchecked. So please combine.
> 

Hi,

I have no knowledge about this particular hardware to give a realistic
example. Could someone advise here? Or should I just use the first
example for now?

Thanks

>> +  - |
>> +    dwmmc0@...00000 {
>> +      compatible = "snps,dw-mshc";
>> +      clocks = <&clock 351>, <&clock 132>;
>> +      clock-names = "biu", "ciu";
>> +      reg = <0x12200000 0x1000>;
>> +      interrupts = <0 75 0>;
>> +      #address-cells = <1>;
>> +      #size-cells = <0>;
>> +      data-addr = <0x200>;
>> +      fifo-watermark-aligned;
>> +      resets = <&rst 20>;
>> +      reset-names = "reset";
>> +    };
>> +  # [board specific internal DMA resources]
>> +  - |
>> +    dwmmc0@...00000 {
>> +      clock-frequency = <400000000>;
>> +      clock-freq-min-max = <400000 200000000>;
>> +      broken-cd;
>> +      fifo-depth = <0x80>;
>> +      card-detect-delay = <200>;
>> +      vmmc-supply = <&buck8>;
>> +      bus-width = <8>;
>> +      cap-mmc-highspeed;
>> +      cap-sd-highspeed;
>> +    };
>> +  # [board specific generic DMA request binding]
>> +  - |
>> +    dwmmc0@...00000 {
>> +      clock-frequency = <400000000>;
>> +      clock-freq-min-max = <400000 200000000>;
>> +      broken-cd;
>> +      fifo-depth = <0x80>;
>> +      card-detect-delay = <200>;
>> +      vmmc-supply = <&buck8>;
>> +      bus-width = <8>;
>> +      cap-mmc-highspeed;
>> +      cap-sd-highspeed;
>> +      dmas = <&pdma 12>;
>> +      dma-names = "rx-tx";
>> +    };
>> --
>> 2.11.0
>>