linux-kernel - Re: [PATCH v10 1/4] MIPS: Loongson64: dts: update the display controller device node

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Date:   Mon, 21 Feb 2022 11:01:49 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Sergei Shtylyov <sergei.shtylyov@...il.com>,
        Sui Jingfeng <15330273260@....cn>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Roland Scheidegger <sroland@...are.com>,
        Zack Rusin <zackr@...are.com>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>,
        Sam Ravnborg <sam@...nborg.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Ilia Mirkin <imirkin@...m.mit.edu>,
        Qing Zhang <zhangqing@...ngson.cn>,
        suijingfeng <suijingfeng@...ngson.cn>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v10 1/4] MIPS: Loongson64: dts: update the display
 controller device node

On 21/02/2022 10:19, Sergei Shtylyov wrote:
> On 2/20/22 5:55 PM, Sui Jingfeng wrote:
> 
>> From: suijingfeng <suijingfeng@...ngson.cn>
>>
>> The display controller is a pci device, its PCI vendor id is 0x0014
>> its PCI device id is 0x7a06.
>>
>> 1) In order to let the driver to know which chip the DC is contained
>>    in, the compatible string of the display controller is updated
>>    according to the chip's name.
>>
>> 2) Add display controller device node for ls2k1000 SoC
>>
>> Reported-by: Krzysztof Kozlowski <krzk@...nel.org>
>> Signed-off-by: suijingfeng <suijingfeng@...ngson.cn>
>> Signed-off-by: Sui Jingfeng <15330273260@....cn>
>> ---
>>  arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi | 8 ++++++++
>>  arch/mips/boot/dts/loongson/ls7a-pch.dtsi          | 7 ++-----
>>  2 files changed, 10 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
>> index 768cf2abcea3..af9cda540f9e 100644
>> --- a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
>> +++ b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
>> @@ -209,6 +209,14 @@ gpu@5,0 {
>>  				interrupt-parent = <&liointc0>;
>>  			};
>>  
>> +			lsdc: display-controller@6,0 {
> 
>    Shouldn't the node name just be "display", according to the section 2.2.2
> of the DT spec?

lcd-controller, led-controller. As I understood from the bindings, this
is not physical device displaying something (like a panel) but rather a
device controlling such panel. Therefore display-controller feels
appropriate.


Best regards,
Krzysztof