linux-kernel - Re: [PATCH v2 3/3] arm64: dts: qcom: apq8016: Add Schneider HMIBSC board DTS

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Date: Thu, 14 Mar 2024 10:18:29 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Sumit Garg <sumit.garg@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 andersson@...nel.org, robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
 conor+dt@...nel.org, stephan@...hold.net, caleb.connolly@...aro.org,
 neil.armstrong@...aro.org, laetitia.mariottini@...com,
 pascal.eberhard@...com, abdou.saker@...com, jimmy.lalande@...com,
 benjamin.missey@....se.com, daniel.thompson@...aro.org,
 linux-kernel@...r.kernel.org, Jagdish Gediya <jagdish.gediya@...aro.org>
Subject: Re: [PATCH v2 3/3] arm64: dts: qcom: apq8016: Add Schneider HMIBSC
 board DTS



On 3/14/24 10:04, Sumit Garg wrote:
> Hi Konrad,
> 
> On Wed, 13 Mar 2024 at 18:34, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>>
>>
>>
>> On 3/13/24 13:30, Sumit Garg wrote:
>>> Add Schneider Electric HMIBSC board DTS. The HMIBSC board is an IIoT Edge
>>> Box Core board based on the Qualcomm APQ8016E SoC.
>>>
>>> Support for Schneider Electric HMIBSC. Features:
>>> - Qualcomm Snapdragon 410C SoC - APQ8016 (4xCortex A53, Adreno 306)
>>> - 1GiB RAM
>>> - 8GiB eMMC, SD slot
>>> - WiFi and Bluetooth
>>> - 2x Host, 1x Device USB port
>>> - HDMI
>>> - Discrete TPM2 chip over SPI
>>> - USB ethernet adaptors (soldered)
>>>
>>> Co-developed-by: Jagdish Gediya <jagdish.gediya@...aro.org>
>>> Signed-off-by: Jagdish Gediya <jagdish.gediya@...aro.org>
>>> Signed-off-by: Sumit Garg <sumit.garg@...aro.org>
>>> ---
>>
>> [...]
>>
>>> +     memory@...00000 {
>>> +             reg = <0 0x80000000 0 0x40000000>;
>>> +     };
>>
>> I'm not sure the entirety of DRAM is accessible..
>>
>> This override should be unnecessary, as bootloaders generally update
>> the size field anyway.
> 
> On this board, U-Boot is used as the first stage bootloader (replacing
> Little Kernel (LK), thanks to Stephan's work). And U-Boot consumes
> memory range from DT as Linux does but doesn't require any memory to
> be reserved for U-Boot itself. So apart from reserved memory nodes
> explicitly described in DT all the other DRAM regions are accessible.

Still, u-boot has code to fetch the size dynamically, no?

[...]

>>
>>> +
>>> +             compatible = "adi,adv7533";
>>> +             reg = <0x39>;
>>> +
>>> +             interrupt-parent = <&tlmm>;
>>> +             interrupts = <31 IRQ_TYPE_EDGE_FALLING>;
>>
>> interrupts-extended
>>
> 
> Please see Documentation/devicetree/bindings/display/bridge/adi,adv7533.yaml.

Okay, and what am I supposed to see there?

Konrad