linux-kernel - Re: [PATCHv2 5/5] arm64: allwinner: a64: Add support for TERES-I laptop

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Date:   Mon, 25 Jun 2018 10:13:01 +0200
From:   Arend van Spriel <arend.vanspriel@...adcom.com>
To:     Icenowy Zheng <icenowy@...c.io>, Harald Geyer <harald@...ib.org>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andre Przywara <andre.przywara@....com>, info@...mex.com,
        linux-wireless@...r.kernel.org
Subject: Re: [PATCHv2 5/5] arm64: allwinner: a64: Add support for TERES-I
 laptop

On 6/25/2018 9:47 AM, Icenowy Zheng wrote:
>
>
> 于 2018年6月25日 GMT+08:00 下午3:43:51, Arend van Spriel <arend.vanspriel@...adcom.com> 写到:
>> On 6/24/2018 6:34 PM, Harald Geyer wrote:
>>> Icenowy Zheng writes:
>>>>> 在 2018-03-15四的 16:25 +0000，Harald Geyer写道：
>>>>>>> +&mmc1 {
>>>>>>> +	pinctrl-names = "default";
>>>>>>> +	pinctrl-0 = <&mmc1_pins>;
>>>>>>> +	vmmc-supply = <&reg_aldo2>;
>>>>>>> +	vqmmc-supply = <&reg_dldo4>;
>>>>>>> +	mmc-pwrseq = <&wifi_pwrseq>;
>>>>>>> +	bus-width = <4>;
>>>>>>> +	non-removable;
>>>>>>> +	status = "okay";
>>>>>>> +
>>>>>>> +	rtl8723bs: wifi@1 {
>>>>>>> +		reg = <1>;
>>>>>>> +		interrupt-parent = <&r_pio>;
>>>>>>> +		interrupts = <0 3 IRQ_TYPE_LEVEL_LOW>; /* PL3 */
>>>>>>> +		interrupt-names = "host-wake";
>>>>>>> +	};
>>
>> [...]
>>
>>>>> - This device node has no binding. The "host-wake" interrupt is
>> part of
>>>>>   Broadcom SDIO Wi-Fi binding, rather than a generic one.
>>> I think the general mmc and interrupts bindings apply. And the mmc
>> binding
>>> clearly states that for sub-nodes a compatible string is optional.
>>>
>>> However I just realized that the 'interrupt-names' property is not
>> part
>>> of the general interrupts binding, so I guess at least this property
>> should
>>> be removed.
>>
>> Indeed. If the device just used the SDIO interrupt this is not needed.
>> The Broadcom device can use either SDIO interrupt or a so-called
>> out-of-band host-wake interrupt, which is what the above represents.
>
> RTL8....S is also capable of use OOB interrupt.

Ok. Is it also in-place in this TERES-I laptop? Anyway, if RTL8...S does 
not have a binding specification there is not much to do about it. In my 
opinion it does not make sense to add it to the generic mmc/sdio binding 
as this interrupt does not involve the mmc/sdio hardware hence the term 
OOB. There is generic wifi binding net/wireless/ieee80211.txt in which 
this could be added. Obviously it would just be a binding and no 
guarantee that the actual device driver supports it so the RTL driver 
would need modification for that.

Regards,
Arend