linux-kernel - Re: [PATCH v2 2/4] spi: Add devicetree bindings documentation for Loongson SPI

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Date:   Wed, 9 Dec 2020 09:16:27 +0800
From:   zhangqing <zhangqing@...ngson.cn>
To:     Sergei Shtylyov <sergei.shtylyov@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     linux-spi@...r.kernel.org, Huacai Chen <chenhc@...ote.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        devicetree@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, gaojuxin@...ngson.cn,
        yangtiezhu@...ngson.cn
Subject: Re: [PATCH v2 2/4] spi: Add devicetree bindings documentation for
 Loongson SPI



On 12/08/2020 10:48 PM, Sergei Shtylyov wrote:
> On 12/8/20 1:47 PM, zhangqing wrote:
>
>>>> Add spi-ls7a binding documentation.
>>>>
>>>> Signed-off-by: Qing Zhang <zhangqing@...ngson.cn>
>>>> ---
>>>>    Documentation/devicetree/bindings/spi/spi-ls7a.txt | 31 ++++++++++++++++++++++
>>>>    1 file changed, 31 insertions(+)
>>>>    create mode 100644 Documentation/devicetree/bindings/spi/spi-ls7a.txt
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/spi/spi-ls7a.txt b/Documentation/devicetree/bindings/spi/spi-ls7a.txt
>>>> new file mode 100644
>>>> index 0000000..56247b5
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/spi/spi-ls7a.txt
>>>> @@ -0,0 +1,31 @@
>>>> +Binding for LOONGSON LS7A SPI controller
>>>> +
>>>> +Required properties:
>>>> +- compatible: should be "pci0014,7a0b.0","pci0014,7a0b","pciclass088000","pciclass0880".
>>>> +- reg: reference IEEE Std 1275-1994.
>>>> +- #address-cells: <1>, as required by generic SPI binding.
>>>> +- #size-cells: <0>, also as required by generic SPI binding.
>>>> +- #interrupts: No hardware interrupt.
>>>     You say it's a required prop, yet yuoe example doesn't have it...
>>          I want to emphasize here that LS7A SPI has no hardware interrupts, and DT is not actually used.
>     The why document the property at all?
           Thank you for your reply again,

           I will remove the #interrupt attribute in the third edition.
>
>>>> +
>>>> +Child nodes as per the generic SPI binding.
>>>> +
>>>> +Example:
>>>> +
>>>> +            spi@16,0 {
>>>> +                compatible = "pci0014,7a0b.0",
>>>> +                        "pci0014,7a0b",
>>>> +                        "pciclass088000",
>>>> +                        "pciclass0880";
>>>> +
>>>> +                #address-cells = <1>;
>>>> +                #size-cells = <0>;
>>>> +                reg = <0xb000 0x0 0x0 0x0 0x0>;
>>>> +                num-chipselects = <0>;
>>>> +                spiflash: s25fl016k@0 {
>>>> +                #address-cells = <1>;
>>>> +                #size-cells = <1>;
>>>     Once more?
>>>
>>>> +                compatible ="spansion,s25fl016k","jedec,spi-nor";
>>>     Once more?
>>>
>>>> + spi-max-frequency=<50000000>;
>>>> +                reg=<0>;
>>>     Once more? Did you mean this for a child node?
>>         Yes, these are child node attributes, the child node splash is not necessary.
>     You should indent the child nodes with 1 more tab...
         I will do it and send the v3 in the soon.
>
>>>> +                };
>>>> +            };
>>       Thanks
>>
>>       -Qing
> MBR, Sergei