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

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Date:   Thu, 23 Feb 2023 16:40:33 +0800
From:   suijingfeng <suijingfeng@...ngson.cn>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        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 2023/2/23 15:58, 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).

I *do* run the test against the bindings and the test result say nothing.

I reset my modify today made, then re-run the test again.

I'm telling the truth: the test result say nothing. I paste the log at 
below:

make -j$(nproc) ARCH=loongarch 
CROSS_COMPILE=loongarch64-unknown-linux-gnu- dt_binding_check 
DT_SCHEMA_FILES=Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml 
dtbs_check 
DT_SCHEMA_FILES=Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml

   DTEX 
Documentation/devicetree/bindings/display/loongson/loongson,display-controller.example.dts
   DTC_CHK 
Documentation/devicetree/bindings/display/loongson/loongson,display-controller.example.dtb


I remember, if there anything wrong, rob's test robot will complain.

let's wait and witness.

>> This patchset  mainly used to illustrate how  we made the driver in [1]
>> usable on our SoC platform.
>>
>>> It's the same
>>> patchset. You basically send something which the same moment is incorrect.
>> Loongson display controller IP has been integrated in both Loongson
>> North Bridge chipset(ls7a1000 and ls7a2000) and Loongson SoCs(ls2k1000
>> and ls2k2000 etc), it even has been included in Loongson BMC(ls2k0500 bmc)
>> products.
> I don't understand how your reply here is relevant to incorrect bindings
> or incorrect DTS according to bindings.

Ok, now I know that you refer to the bindings.

I'm a newbie at DT bindings, but i will correct all of the problem you 
mentioned.

It takes a few time, thanks for  your valuable advice.

>
> Best regards,
> Krzysztof