linux-kernel - Re: [PATCH 4/4 v3] ARM: dts: Exynos5420: Add device nodes for TMU blocks

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Date:	Mon, 09 Dec 2013 13:57:09 +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 4/4 v3] ARM: dts: Exynos5420: Add device nodes for TMU
 blocks

Hi Naveen,

On Tuesday 12 of November 2013 12:07:48 Naveen Krishna Chatradhi wrote:
> Exynos5420 SoC has per core thermal management unit.
> 5 TMU channels 4 for CPUs and 5th for GPU.
> 
> This patch adds the device tree nodes to the DT device list.
> 
> Nodes carry the misplaced second base address and the second
> clock to access the misplaced base address.
> 
> Signed-off-by: Leela Krishna Amudala <l.krishna@...sung.com>
> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@...sung.com>
> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
> ---
> Changes since v2:
> 3. uses the new compatible strings introduced along with adding
>    support for Exynso5420.
> 
> Changes since v1:
> 1. Nodes carry the misplaced second base address and the second
>    clock to access the misplaced base address.
> 2. Correct the clock number for the TMU4
> 
>  arch/arm/boot/dts/exynos5420.dtsi |   48 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)

In addition to updating to reflect my comments to patch 3/4, please also
see my comments inline.

> diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi
> index 6ffefd1..d736b40 100644
> --- a/arch/arm/boot/dts/exynos5420.dtsi
> +++ b/arch/arm/boot/dts/exynos5420.dtsi
> @@ -369,4 +369,52 @@
>  		clock-names = "gscl";
>  		samsung,power-domain = <&gsc_pd>;
>  	};
> +
> +	/* tmu for CPU0 */
> +	tmu@...60000 {

Instead of the comment, it might be better to add a label to the node,
such as

tmu_cpu0: tmu@...60000 {

for TMU of CPU0 and so on.

> +		compatible = "samsung,exynos5420-tmu";
> +		reg = <0x10060000 0x100>;
> +		interrupts = <0 65 0>;
> +		clocks = <&clock 318>;
> +		clock-names = "tmu_apbif";
> +	};
> +
> +	/* tmu for CPU1 */
> +	tmu@...64000 {
> +		compatible = "samsung,exynos5420-tmu";
> +		reg = <0x10064000 0x100>;
> +		interrupts = <0 183 0>;
> +		clocks = <&clock 318>;
> +		clock-names = "tmu_apbif";
> +	};
> +
> +	/* tmu for CPU2 */
> +	tmu@...68000 {
> +		compatible = "samsung,exynos5420-tmu-triminfo";
> +		/* 2nd reg is for the misplaced TRIMINFO register */

Hmm, I'm not convinced about usefulness of this comment. Used compatible
value directly implies the meaning of all reg entries.

Best regards,
Tomasz

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