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

Tomasz Figa
2013-12-09T12:43:18Z

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@samsung.com>
> Signed-off-by: Andrew Bresticker <abrestic@chromium.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