linux-kernel - Re: [RFC v4 2/6] Bindings: nvmem: add bindings for JZ4780 efuse

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Date:   Wed, 19 Feb 2020 18:38:15 +0800
From:   Zhou Yanjie <zhouyanjie@...yeetech.com>
To:     "H. Nikolaus Schaller" <hns@...delico.com>,
        PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Mathieu Malaterre <malat@...ian.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, linux-mips@...r.kernel.org,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>
Subject: Re: [RFC v4 2/6] Bindings: nvmem: add bindings for JZ4780 efuse

Hi Nikolaus,

On 2020年02月19日 13:48, H. Nikolaus Schaller wrote:
>> Am 18.02.2020 um 22:26 schrieb Rob Herring <robh@...nel.org>:
>>
>> On Mon, Feb 17, 2020 at 05:55:26PM +0100, H. Nikolaus Schaller wrote:
>>> From: PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
>>>
>>> This patch brings support for the JZ4780 efuse. Currently it only expose
>>> a read only access to the entire 8K bits efuse memory.
>>>
>>> Tested-by: Mathieu Malaterre <malat@...ian.org>
>>> Signed-off-by: PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
>>> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
>>> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
>>> ---
>>> .../bindings/nvmem/ingenic,jz4780-efuse.txt     | 17 +++++++++++++++++
>>> 1 file changed, 17 insertions(+)
>>> create mode 100644 Documentation/devicetree/bindings/nvmem/ingenic,jz4780-efuse.txt
>> Please convert to a DT schema.
> Is there someone of you who can help to do that?
>
> DT schemas are still like a Chinese dialect for me (i.e. I can decipher with help but neither speak nor write).
>
> BR and thanks,
> Nikolaus

I am also suffering from this, and I am going to ask Paul for advice.

>
>>> diff --git a/Documentation/devicetree/bindings/nvmem/ingenic,jz4780-efuse.txt b/Documentation/devicetree/bindings/nvmem/ingenic,jz4780-efuse.txt
>>> new file mode 100644
>>> index 000000000000..339e74daa9a9
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/nvmem/ingenic,jz4780-efuse.txt
>>> @@ -0,0 +1,17 @@
>>> +Ingenic JZ EFUSE driver bindings
>>> +
>>> +Required properties:
>>> +- "compatible"		Must be set to "ingenic,jz4780-efuse"
>>> +- "reg"			Register location and length
>>> +- "clocks"		Handle for the ahb clock for the efuse.
>>> +- "clock-names"		Must be "bus_clk"
>> 'clk' is redundant. How about 'ahb'?

How about replace "bus_clk" with "efuse"? Other SoCs (like T21, X1000, 
X1500, X1830, X2000) has a dedicated bit in the CLKGR register to 
control the EFUSE clock.
A corresponding "XXX_CLK_EFUSE" is provided in the "xxx-cgu.c" driver.

Thanks and best regards!

>>> +
>>> +Example:
>>> +
>>> +efuse: efuse@...100d0 {
>>> +	compatible = "ingenic,jz4780-efuse";
>>> +	reg = <0x134100d0 0x2c>;
>>> +
>>> +	clocks = <&cgu JZ4780_CLK_AHB2>;
>>> +	clock-names = "bus_clk";
>>> +};
>>> -- 
>>> 2.23.0
>>>