From: Johan Hovold <johan@kernel.org>
To: Jonathan Marek <jonathan@marek.ca>
Cc: linux-arm-msm@vger.kernel.org,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 4/5] arm64: dts: qcom: x1e80100-crd: add rtc offset to set rtc time
Date: Fri, 18 Oct 2024 11:44:30 +0200 [thread overview]
Message-ID: <ZxIt_oct24WuIssO@hovoldconsulting.com> (raw)
In-Reply-To: <663cf3f6-3254-e490-d557-a12aa41a1628@marek.ca>
On Wed, Oct 16, 2024 at 09:31:00AM -0400, Jonathan Marek wrote:
> On 10/16/24 2:51 AM, Johan Hovold wrote:
> > On Mon, Oct 14, 2024 at 08:47:29PM -0400, Jonathan Marek wrote:
> >> Note: the 0xbc offset is arbitrary, it just needs to not be already in use.
> >
> > How did you verify that nothing is using this offset on this platform? I
> > assume we need someone with access to the docs to make sure it's not in
> > use as we did for sc8280xp.
>
> AFAIK qcom allocate things from the start of the SDAM, so allocating
> from the end of the SDAM should be safe. And AFAIK this is supposed to
> be a general purpose HLOS (linux/windows) SDAM block, so should be
> mostly free to use.
From what I understand these registers are also used for things like
programmable LEDs (e.g. see 24e2d05d1b68 ("leds: Add driver for Qualcomm
LPG")). And who knows what else.
It would be good if someone from Qualcomm could confirm that these bytes
are free for use before merging. I've started asking around.
Johan
next prev parent reply other threads:[~2024-10-18 9:44 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-15 0:47 [PATCH v3 0/5] x1e80100 RTC support Jonathan Marek
2024-10-15 0:47 ` [PATCH v3 2/5] dt-bindings: rtc: qcom-pm8xxx: document qcom,no-alarm flag Jonathan Marek
2024-10-15 5:33 ` Krzysztof Kozlowski
2024-10-16 6:46 ` Johan Hovold
2024-10-15 0:47 ` [PATCH v3 3/5] arm64: dts: qcom: x1e80100-pmics: enable RTC Jonathan Marek
2024-10-15 0:47 ` [PATCH v3 4/5] arm64: dts: qcom: x1e80100-crd: add rtc offset to set rtc time Jonathan Marek
2024-10-16 6:51 ` Johan Hovold
2024-10-16 13:31 ` Jonathan Marek
2024-10-18 9:44 ` Johan Hovold [this message]
2024-10-31 20:09 ` Konrad Dybcio
2024-10-15 0:47 ` [PATCH v3 5/5] arm64: dts: qcom: x1e78100-t14s: " Jonathan Marek
2025-01-12 23:35 ` [PATCH v3 0/5] x1e80100 RTC support Alexandre Belloni
2025-01-20 14:51 ` Johan Hovold
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