linux-kernel - Re: [PATCH v6 3/3] arm64: dts: rockchip: add dts for Ariaboard Photonicat RK3568

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Message-ID: <7b55c7469774c41d9896df3100df1630@manjaro.org>
Date: Mon, 13 Jan 2025 05:25:44 +0100
From: Dragan Simic <dsimic@...jaro.org>
To: Junhao Xie <bigfoot@...ssfun.cn>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Rob
 Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor
 Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>, Jonas
 Karlman <jonas@...boo.se>, Chukun Pan <amadeus@....edu.cn>, FUKAUMI Naoki
 <naoki@...xa.com>, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 3/3] arm64: dts: rockchip: add dts for Ariaboard
 Photonicat RK3568

Hello Junhao,

On 2025-01-12 23:16, Junhao Xie wrote:
> On 2025/1/12 16:47, Dragan Simic wrote:
>> On 2025-01-12 08:33, Junhao Xie wrote:
>>> Add dts for Ariaboard Photonicat RK3568.
>>> 
>>> Working IO:
>>>     Debug UART
>>>     SDIO QCA9377 WiFi and Bluetooth
>>>     M.2 E-Key PCIe WiFi and Bluetooth
>>>     M.2 B-Key USB Modem WWAN
>>>     Ethernet WAN Port
>>>     MicroSD Card slot
>>>     eMMC
>>>     HDMI Output
>>>     Mali GPU
>>>     USB Type-A
>>> 
>>> Not working IO:
>>>     Ethernet LAN Port (Lack of SGMII support)
>>>     Power management MCU on UART4 (Driver pending)
>>> 
>>> Not working IO in MCU:
>>>     Battery voltage sensor
>>>     Board temperature sensor
>>>     Hardware Power-off
>>>     Hardware Watchdog
>>>     Network status LED
>>>     Real-time clock
>>>     USB Charger voltage sensor
>>> 
>>> About onboard power management MCU:
>>>     A heartbeat must be sent to the MCU within 60 seconds,
>>>     otherwise the MCU will restart the system.
>>>     When powering off, a shutdown command needs to be sent to the 
>>> MCU.
>>>     When the power button is long pressed, the MCU will send a 
>>> shutdown
>>>     command to the system. If system does not shutdown within 60 
>>> seconds,
>>>     the power will be turned off directly.
>>>     MCU only provides voltage for charger and battery.
>>>     Manufacturer removed RK8xx PMIC.
>> 
>> Unless the design of the board is proprietary, it would be good
>> to provide a link to the board schematic, for those interested
>> in verifying the board DT file.
>> 
>> As a note, I already tried to find the board schematic with no
>> success, so the design might be proprietary.
> 
> Yes, this board is proprietary. I asked the manufacturer and
> they don't provide schematics.
> 
> But I found a partial schematic diagram of some of connectors
> on the board here
> https://dl.ariaboard.com/photonicat_rk3568/Photonicat%20rk3568%20EVB%20Board%20spec.pdf

Yes, I also found that PDF file.  It's somewhat similar to what
Raspberry Pi provides with its reduced schematics -- helpful to
an extent, but still leaving a lot to be desired.

Out of curiosity, what did you actually use as a reference to create
the board dts file?  Perhaps some downstream dts file provided by
the manufacturer or found in some operating system image?