linux-kernel - Re: [PATCH v2] clk: exynos4: Fix wrong clock for Exynos4x12 ADC

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Date:	Thu, 9 Jul 2015 09:23:32 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Tomasz Figa <tomasz.figa@...il.com>
Cc:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Javier Martinez Canillas <javier@...hile0.org>,
	stable@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Kukjin Kim <kgene@...nel.org>, linux-clk@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] clk: exynos4: Fix wrong clock for Exynos4x12 ADC

2015-07-06 14:12 GMT+09:00 Tomasz Figa <tomasz.figa@...il.com>:
> 2015-07-06 13:03 GMT+09:00 Krzysztof Kozlowski <k.kozlowski@...sung.com>:
>> 2015-06-12 14:46 GMT+09:00 Javier Martinez Canillas <javier@...hile0.org>:
>>> Hello Krzysztof,
>>>
>>> On Fri, Jun 12, 2015 at 3:53 AM, Krzysztof Kozlowski
>>> <k.kozlowski@...sung.com> wrote:
>>>> The TSADC gate clock was used in Exynos4x12 DTSI for exynos-adc driver.
>>>> However TSADC is present only on Exynos4210 so on Trats2 board (with
>>>> Exynos4412 SoC) the exynos-adc driver could not be probed:
>>>>    ERROR: could not get clock /adc@...C0000:adc(0)
>>>>    exynos-adc 126c0000.adc: failed getting clock, err = -2
>>>>    exynos-adc: probe of 126c0000.adc failed with error -2
>>>>
>>>> Instead on Exynos4x12 SoCs the main clock used by Analog to Digital
>>>> Converter is located in different register and it is named in datasheet
>>>> as PCLK_ADC. Regardless of the name the purpose of this PCLK_ADC clock
>>>> is the same as purpose of TSADC from Exynos4210.
>>>>
>>>> The patch adds gate clock for Exynos4x12 using the proper register so
>>>> backward compatibility is preserved. This fixes the probe of exynos-adc
>>>> driver on Exynos4x12 boards and allows accessing sensors connected to it
>>>> on Trats2 board (ntc,ncp15wb473 AP and battery thermistors).
>>>>
>>>> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
>>>> Cc: <stable@...r.kernel.org>
>>>> Fixes: c63c57433003 ("ARM: dts: Add ADC's dt data to read raw data for exynos4x12")
>>>> Link: https://lkml.org/lkml/2015/6/11/85
>>>>
>>>> ---
>>>>
>>>> Changes since v1:
>>>> 1. After discussion on LKML this solution was chosen because it smaller,
>>>>    simpler, self-contained (one patch to fix issue) and maintains backward
>>>>    compatibility. Thanks to Javier Martinez Canillas and Tomasz Figa for
>>>>    valuable comments.
>>>> 2. Dropped patch 2/2 because now it is not needed. The clock id "TSADC"
>>>>    will be used on all Exynos4 boards.
>>>> 3. Added CC-stable.
>>>> ---
>>>>  drivers/clk/samsung/clk-exynos4.c | 2 ++
>>>>  1 file changed, 2 insertions(+)
>>>>
>>>
>>> Patch looks good to me.
>>>
>>> Reviewed-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
>>
>> Hi Tomasz and Sylwester,
>>
>> Any comments on this version of patch?
>> Tomasz, you gave me comments on previous version. Are their satisfied?
>
> Acked-by: Tomasz Figa <tomasz.figa@...il.com>

Thanks for ack.

Sylwester, are you gonna to pick it up or this should go through other tree?

Best regards,
Krzysztof
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