linux-kernel - Re: [PATCH 1/2] Mips: ls2k1000: dts: add the display controller device node

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Message-ID: <9e890c83-495b-87d5-68bf-838c7cf0c003@kernel.org>
Date:   Thu, 23 Feb 2023 09:05:08 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Sui jingfeng <suijingfeng@...ngson.cn>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 1/2] Mips: ls2k1000: dts: add the display controller
 device node

On 23/02/2023 08:58, Krzysztof Kozlowski wrote:
> On 23/02/2023 04:19, Sui jingfeng wrote:
>> Hi,
>>
>> On 2023/2/23 02:32, Krzysztof Kozlowski wrote:
>>> On 22/02/2023 17:55, suijingfeng wrote:
>>>> The display controller is a pci device, it's pci vendor id is
>>>> 0x0014, it's pci device id is 0x7a06.
>>>>
>>>> Signed-off-by: suijingfeng <suijingfeng@...ngson.cn>
>>>> ---
>>>>   .../boot/dts/loongson/loongson64-2k1000.dtsi  | 21 +++++++++++++++++++
>>>>   1 file changed, 21 insertions(+)
>>>>
>>>> diff --git a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
>>>> index 8143a61111e3..a528af3977d9 100644
>>>> --- a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
>>>> +++ b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
>>>> @@ -31,6 +31,18 @@ memory@...000 {
>>>>   			<0x00000001 0x10000000 0x00000001 0xb0000000>; /* 6912 MB at 4352MB */
>>>>   	};
>>>>   
>>>> +	reserved-memory {
>>>> +		#address-cells = <2>;
>>>> +		#size-cells = <2>;
>>>> +		ranges;
>>>> +
>>>> +		display_reserved: framebuffer@...00000 {
>>>> +			compatible = "shared-dma-pool";
>>>> +			reg = <0x0 0x30000000 0x0 0x04000000>; /* 64M */
>>>> +			linux,cma-default;
>>>> +		};
>>>> +	};
>>>> +
>>>>   	cpu_clk: cpu_clk {
>>>>   		#clock-cells = <0>;
>>>>   		compatible = "fixed-clock";
>>>> @@ -198,6 +210,15 @@ sata@8,0 {
>>>>   				interrupt-parent = <&liointc0>;
>>>>   			};
>>>>   
>>>> +			display-controller@6,0 {
>>>> +				compatible = "loongson,ls2k1000-dc";
>>>> +
>>>> +				reg = <0x3000 0x0 0x0 0x0 0x0>;
>>>> +				interrupts = <28 IRQ_TYPE_LEVEL_LOW>;
>>>> +				interrupt-parent = <&liointc0>;
>>>> +				memory-region = <&display_reserved>;
>>> NAK.
>> Err :(,  please give me a chance to explain
>>> Test your code against the bindings you send.
>>
>> I can guarantee to you that I test may code more than twice. The code 
>> used to testing is listed at link [1].
> 
> I wrote - test against the bindings. I don't believe that it was tested.
> Please paste the output of the testing (dtbs_check).

OTOH, dtschema has some hickups on loongsoon DTS, so I doubt you could
even test it. Anyway, where is above property memory-region described in
the bindings?

Best regards,
Krzysztof