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From: Marc Gonzalez <marc.w.gonzalez@free.fr>
To: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: MSM <linux-arm-msm@vger.kernel.org>,
	Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Subject: Re: [PATCHv9 2/3] arm64: dts: qcom: msm8998: Add Coresight support
Date: Wed, 2 Oct 2019 17:21:23 +0200	[thread overview]
Message-ID: <585ee38c-39d1-47df-78b7-f4b670f17a25@free.fr> (raw)
In-Reply-To: <CANLsYkxPOOorqcnPrbhZLzGV9Y7EGWUUyxvi-Cm5xxnzhx=Ecg@mail.gmail.com>

On 02/10/2019 17:03, Mathieu Poirier wrote:

> The problem here is that a debug and production device are using the
> same device tree, i.e msm8998.dtsi.  Disabling coresight devices in
> the DTS file will allow the laptop to boot but completely disabled
> coresight blocks on the MTP board.  Leaving things as is breaks the
> laptop but allows coresight to be used on the MTP board.  One of three
> things can happen:
> 
> 1) Nothing gets done and production board can't boot without DTS modifications.
> 2) Disable tags are added to the DTS file and the debug board can't
> use coresight without modifications.
> 2) The handling of the debug power domain is done properly on the
> MSM8998 rather than relying on the bootloader to enable it.
> 3) The DTS file is split or reorganised to account for debug/production devices.

I believe 3) is already the de facto situation.

arch/arm64/boot/dts/qcom/msm8998.dtsi is the "base" config.
arch/arm64/boot/dts/qcom/msm8998-mtp.dtsi for the MTP board.
arch/arm64/boot/dts/qcom/msm8998-clamshell.dtsi for the laptops.

> Which of the above ends up being the final solution is entirely up to
> David and Andy.

2498f8c1c668 ;-)

Regards.

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  reply	other threads:[~2019-10-02 15:21 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-31  5:57 [PATCHv9 0/3] Add coresight support for SDM845, MSM8998 and MSM8996 Sai Prakash Ranjan
2019-07-31  5:58 ` [PATCHv9 1/3] arm64: dts: qcom: sdm845: Add Coresight support Sai Prakash Ranjan
2019-07-31  6:05   ` Sai Prakash Ranjan
2019-08-07 10:08     ` Sai Prakash Ranjan
2019-08-07 10:12       ` Suzuki K Poulose
2019-08-07 11:16         ` Sai Prakash Ranjan
2019-07-31  5:58 ` [PATCHv9 2/3] arm64: dts: qcom: msm8998: " Sai Prakash Ranjan
2019-10-01 16:13   ` Jeffrey Hugo
2019-10-01 17:04     ` Sai Prakash Ranjan
2019-10-01 17:14       ` Jeffrey Hugo
2019-10-01 17:31         ` Suzuki K Poulose
2019-10-01 17:52         ` Sai Prakash Ranjan
2019-10-01 18:01           ` Jeffrey Hugo
2019-10-01 18:05             ` Sai Prakash Ranjan
2019-10-02 15:03               ` Mathieu Poirier
2019-10-02 15:21                 ` Marc Gonzalez [this message]
2019-10-02 15:34                   ` Mathieu Poirier
2019-10-02 15:49                     ` Jeffrey Hugo
2019-10-03 10:20                 ` Daniel Thompson
2019-10-03 10:52                   ` Suzuki K Poulose
2019-10-03 12:52                     ` Daniel Thompson
2019-07-31  5:58 ` [PATCHv9 3/3] arm64: dts: qcom: msm8996: " Sai Prakash Ranjan

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