linux-kernel - Re: [PATCHv6 2/4] ARM: dts: exynos5422-odroidxu3: Enable TMU at Exynos5422 base

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Message-id: <557E181C.7070209@samsung.com>
Date:	Mon, 15 Jun 2015 09:11:08 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Anand Moon <linux.amoon@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene@...nel.org>
Cc:	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv6 2/4] ARM: dts: exynos5422-odroidxu3: Enable TMU at
 Exynos5422 base

On 14.06.2015 19:24, Anand Moon wrote:
> This changes enables TMU IP block on the Exynos5422 Odroid-XU3
> device.
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> Tested-by: Markus Reichl <m.reichl@...etechno.de>

This does not look right.
You put this "Tested-by" since beginning of this patchset (v1) but first
it was LDO10. Then you proposed LDO18 and now you use LDO7 from my
suggestion. Which of this was tested by Markus because I cannot find his
emails with it on LKML?

Krzysztof

> Acked-by: Lukasz Majewski <l.majewski@...sung.com>
> ---
> Changes rebase on git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung branch for-next
> Changes from v5: Use LDO7 regulator instead of LD010.
> 
> The output of LDO18 goes to VDD_EMMC_1V8. This is not regulator for TMU.
> 
> I think the schematics are missing some of details but it can be deducted that:
> 1. TEMP SE is supplied by VDD18_TS power domain. It consists of 5
> pairs of pins (XTSTEST_OUT[0-4], XTSEXT_RES[0-4]).
> 2. The VDD18_TS01, VDD18_TS23 and VDD18_TS4 are wired to the LDO7 of
> S2MPS11 PMIC.
> 3. I confirmed with the Exynos5422 datasheet that these
> VDD18_TS{01,23,4} supply the XTSTEST pins (OUT and RES).
> 
> So the LDO7 it is... but before using it there is a caveat. The LDO7
> is also connected to VDD of MIPI, HDMI and few more. So when you use
> this regulator in TMU it may be turned off by TMU driver (e.g. during
> unbind). In such case these other blocks also should be tested and
> checked whether they take this regulator and enable it.
> ---
>  arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi | 25 ++++++++++++++++++++++
>  1 file changed, 25 insertions(+)

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