linux-kernel - Re: [PATCH v2 1/2] gpio: dt-bindings: add parsing of loongson gpio offset

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Date:   Wed, 2 Aug 2023 16:37:50 +0800
From:   Yinbo Zhu <zhuyinbo@...ngson.cn>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     Conor Dooley <conor@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jianmin Lv <lvjianmin@...ngson.cn>, wanghongliang@...ngson.cn,
        Liu Peibao <liupeibao@...ngson.cn>,
        loongson-kernel@...ts.loongnix.cn, zhuyinbo@...ngson.cn
Subject: Re: [PATCH v2 1/2] gpio: dt-bindings: add parsing of loongson gpio
 offset



在 2023/8/2 下午3:50, Conor Dooley 写道:
> On Wed, Aug 02, 2023 at 03:44:17PM +0800, Yinbo Zhu wrote:
>> 在 2023/8/2 下午3:22, Conor Dooley 写道:
>>> On Wed, Aug 02, 2023 at 09:38:34AM +0800, Yinbo Zhu wrote:
>>>> 在 2023/8/1 下午11:54, Conor Dooley 写道:
>>>>> On Tue, Aug 01, 2023 at 04:34:30PM +0800, Yinbo Zhu wrote:
> 
>>>>>> Sorry, I may not have described it clearly before, the ls2k500 was only
>>>>>> as a example, actually, Loongson GPIO controllers (2k500,2k1000,eg)come
>>>>>> in multiple variants that are compatible except for certain register
>>>>>> offset values.  So above all offset device property was used to in all
>>>>>> loongson gpio controller.
>>>>>
>>>>> But it would be good to know why they are different. Do they each
>>>>> support some different features, or was there some other reason for
>>>>> making controllers like this?
>>>>
>>>>
>>>> There are no other reasons, just differences in these offset addresses.
>>>
>>> Huh. Do you have a link to a devicetree for the ls2k500?
>>
>>
>> Yes,  there was a link about ls2k500 dts,  but that ls2k500 dts has not
>> yet added a gpio node.  this gpio node will be added later.
> 
> You must have something that you used to test with, no? I don't mind if
> it is not a patch, but rather is some WIP - I'd just like to see user of
> the binding :)


yes, I have a test, for 2k0500, that gpio dts as follows:

                 gpio0:gpio@...fe10430 {
                         compatible = "loongson,ls2k-gpio";
                         reg = <0 0x1fe10430 0 0x20>;
                         gpio-controller;
                         #gpio-cells = <2>;
			interrupt-parent = <&liointc1>;
                         ngpios = <64>;
                         loongson,gpio-conf-offset = <0>;
                         loongson,gpio-out-offset = <0x10>;
                         loongson,gpio-in-offset = <0x8>;
                         loongson,gpio-inten-offset = <0xb0>;
			loongson,gpio-ctrl-mode = <0x0>;
                         ...
		  }

                 gpio1:gpio@...fe10450 {
                         compatible = "loongson,ls2k-gpio";
                         reg = <0 0x1fe10450 0 0x20>;
                         gpio-controller;
                         #gpio-cells = <2>;
			interrupt-parent = <&liointc1>;
                         ngpios = <64>;
                         loongson,gpio-conf-offset = <0>;
                         loongson,gpio-out-offset = <0x10>;
                         loongson,gpio-in-offset = <0x8>;
                         loongson,gpio-inten-offset = <0x98>;
			loongson,gpio-ctrl-mode = <0x0>;
                         ...
	        }


Thanks,
Yinbo.
>