linux-kernel - Re: [PATCH v3 1/1] arm64: dts: qcom: Add Lenovo Yoga C630

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Message-ID: <20190904161247.GP26880@dell>
Date:   Wed, 4 Sep 2019 17:12:47 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     agross@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
        bjorn.andersson@...aro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 1/1] arm64: dts: qcom: Add Lenovo Yoga C630

On Wed, 04 Sep 2019, Sudeep Holla wrote:

> On Wed, Sep 04, 2019 at 01:16:06PM +0100, Lee Jones wrote:
> > From: Bjorn Andersson <bjorn.andersson@...aro.org>
> >
> > The Lenovo Yoga C630 is built on the SDM850 from Qualcomm, but this seem
> > to be similar enough to the SDM845 that we can reuse the sdm845.dtsi.
> >
> > Supported by this patch is: keyboard, battery monitoring, UFS storage,
> > USB host and Bluetooth.
> >
> 
> Just curious to know if the idea of booting using ACPI is completely
> dropped as it's extremely difficult(because the firmware is so hacked
> up and may violate spec, just my opinion) for whatever reasons.

Once [0] is applied, we can boot Mainline using ACPI.

> We just made ACPI table version checking more lenient for this platform
> and would be good to know if we continue to run ACPI on that or will
> abandon and just use DT.

Which patch are you referring to?  If you mean the ACPI v5.0 vs v5.1
patch authored by Ard, then yes I know, I instigated it's existence
due to these devices.

DT will *always* be more enabled than ACPI, so it's advised that you
use DT for anything useful.  ACPI booting is ideal for things like
installing distros however, since they do not tend to provide DTBs in
their installers.

[0] https://lkml.org/lkml/2019/9/3/580

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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