linux-kernel - Re: [PATCH v2] regulator: core: Use different devices for resource allocation and DT lookup

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Message-ID: <be56fd97-08b5-8a7a-2630-371c83dcab18@samsung.com>
Date:   Tue, 13 Dec 2022 23:23:01 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     ChiYuan Huang <u0084500@...il.com>, djrscally@...il.com,
        hdegoede@...hat.com, markgross@...nel.org, lgirdwood@...il.com,
        mcoquelin.stm32@...il.com, alexandre.torgue@...s.st.com,
        yangyingliang@...wei.com, gene_chen@...htek.com,
        chiaen_wu@...htek.com, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        ChiYuan Huang <cy_huang@...htek.com>
Subject: Re: [PATCH v2] regulator: core: Use different devices for resource
 allocation and DT lookup

On 13.12.2022 17:32, Mark Brown wrote:
> On Tue, Dec 13, 2022 at 03:29:00PM +0100, Marek Szyprowski wrote:
>> On 13.12.2022 15:19, ChiYuan Huang wrote:
>>> I don't have the board. Could you help to test this change to see
>>> whether it's been fixed or not?
>> The above change fixes the issue. Thanks! Feel free to add following
>> tags to the final patch:
>> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
>> Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Thanks for jumping on this so quickly!  Marek, are these boards (or
> similar ones) generally available?  They seem great at showing up issues
> so it'd be good if I could get them into my CI and spot problems earlier
> (or something like kernelci.org would be about as good)?

Well, they are quite old, but I've seen some used ones on eBay. Just 
look for "Samsung Chomebook XE503C12" (Peach-Pit) or XE503C32 (Peach-Pi, 
very rare).

Getting it integrated into the CI requires a bit of manual work. You 
have to solder UART lines to the test points on the motherboard. The 
board can be fully controlled via so called Embedded Controller, what in 
practice means that you can turn power on/off by sending commands to the 
dedicated EC UART. The kernel console UART uses 1.8V, while the EC UART 
- 3.3V. Let me know if you need more details.

Peach-Pi was used on kernelci.org some time ago, but I have no idea what 
has happened to it.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland