linux-kernel - Re: [PATCH 3/4 v9] thermal: samsung: Add TMU support for Exynos5420 SoCs

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Message-id: <1424435.eCnbAs4DIp@amdc1227>
Date:	Mon, 09 Dec 2013 13:43:18 +0100
From:	Tomasz Figa <t.figa@...sung.com>
To:	Naveen Krishna Chatradhi <ch.naveen@...sung.com>
Cc:	linux-pm@...r.kernel.org, naveenkrishna.ch@...il.com,
	rui.zhang@...el.com, eduardo.valentin@...com,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	amit.daniel@...sung.com, kgene.kim@...sung.com,
	devicetree@...r.kernel.org, b.zolnierkie@...sung.com,
	cpgs@...sung.com
Subject: Re: [PATCH 3/4 v9] thermal: samsung: Add TMU support for Exynos5420
 SoCs

Hi Naveen, Andrew,

Please see my comments inline.

On Tuesday 12 of November 2013 12:07:05 Naveen Krishna Chatradhi wrote:
> Exynos5420 has 5 TMU channels, the TRIMINFO register is
> misplaced for TMU channels 2, 3 and 4
> TRIMINFO at 0x1006c000 contains data for TMU channel 3
> TRIMINFO at 0x100a0000 contains data for TMU channel 4
> TRIMINFO at 0x10068000 contains data for TMU channel 2
> 
> This patch
> 1 Adds the neccessary register changes and arch information
>    to support Exynos5420 SoCs.
> 2. Handles the gate clock for misplaced TRIMINFO register
> 3. Updates the Documentation at
>    Documentation/devicetree/bindings/thermal/exynos-thermal.txt
> 
> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@...sung.com>
> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
> ---
> Changes since v8:
> 1. rewrote the Documentation for device tree bindings
> 2. Merged the https://lkml.org/lkml/2013/11/7/262 (as this is a fix)
> 3. introduces "samsung,exynos5420-tmu-triminfo" and 
>    "samsung,exynos5420-tmu-triminfo-clk" to handle the TMU channels on
>    Exynos5420 more appropriately
> 
>  .../devicetree/bindings/thermal/exynos-thermal.txt |   45 +++++++++
>  drivers/thermal/samsung/exynos_tmu.c               |   58 ++++++++++-
>  drivers/thermal/samsung/exynos_tmu.h               |    2 +
>  drivers/thermal/samsung/exynos_tmu_data.c          |  106 ++++++++++++++++++++
>  drivers/thermal/samsung/exynos_tmu_data.h          |    8 ++
>  5 files changed, 215 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/thermal/exynos-thermal.txt b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
> index 116cca0..5055b31 100644
> --- a/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
> +++ b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
> @@ -6,6 +6,11 @@
>  	       "samsung,exynos4412-tmu"
>  	       "samsung,exynos4210-tmu"
>  	       "samsung,exynos5250-tmu"
> +	       "samsung,exynos5420-tmu" for TMU channel 0, 1 on Exynos5420
> +	       "samsung,exynos5420-tmu-triminfo" for TMU channel 2 Exynos5420
> +			(Must pass triminfo base)
> +	       "samsung,exynos5420-tmu-triminfo-clk" for TMU channel 3 and 4
> +			Exynos5420 (Must pass triminfo base and triminfo clock)

I don't think you need those two separate compatible values. Instead you
can keep only the one that requires clock and specify the same base clock
as triminfo clock. Also IMHO "samsung,exynos5420-tmu-ext-triminfo" would
be a better name, as it describes the hardware better (TMU with external
triminfo block, as opposed to normal TMU that has it internally).

Otherwise the patch looks fine.

Best regards,
Tomasz

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