linux-kernel - Re: [PATCH 3/6] clk: tegra: Update binding doc Tegra132

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Message-ID: <20140716072539.GD7978@ulmo>
Date:	Wed, 16 Jul 2014 09:25:40 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
Cc:	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>,
	Stephen Warren <swarren@...dotorg.org>,
	Russell King <linux@....linux.org.uk>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Mike Turquette <mturquette@...aro.org>,
	Joseph Lo <josephl@...dia.com>,
	Alexandre Courbot <acourbot@...dia.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Tuomas Tynkkynen <ttynkkynen@...dia.com>,
	devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/6] clk: tegra: Update binding doc Tegra132

On Tue, Jul 15, 2014 at 06:24:33PM +0300, Peter De Schrijver wrote:
> Tegra132 has almost the same clock structure than Tegra124. This patch
> documents the missing clock IDs.
> 
> Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
> ---
>  .../bindings/clock/nvidia,tegra124-car.txt         |    8 +++++---
>  1 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/clock/nvidia,tegra124-car.txt b/Documentation/devicetree/bindings/clock/nvidia,tegra124-car.txt
> index ded5d62..28129a9 100644
> --- a/Documentation/devicetree/bindings/clock/nvidia,tegra124-car.txt
> +++ b/Documentation/devicetree/bindings/clock/nvidia,tegra124-car.txt
> @@ -1,4 +1,4 @@
> -NVIDIA Tegra124 Clock And Reset Controller
> +NVIDIA Tegra124 and Tegra132 Clock And Reset Controller
>  
>  This binding uses the common clock binding:
>  Documentation/devicetree/bindings/clock/clock-bindings.txt
> @@ -7,14 +7,16 @@ The CAR (Clock And Reset) Controller on Tegra is the HW module responsible
>  for muxing and gating Tegra's clocks, and setting their rates.
>  
>  Required properties :
> -- compatible : Should be "nvidia,tegra124-car"
> +- compatible : Should be "nvidia,tegra124-car" or "nvidia,tegra132-car"
>  - reg : Should contain CAR registers location and length
>  - clocks : Should contain phandle and clock specifiers for two clocks:
>    the 32 KHz "32k_in", and the board-specific oscillator "osc".
>  - #clock-cells : Should be 1.
>    In clock consumers, this cell represents the clock ID exposed by the
>    CAR. The assignments may be found in header file
> -  <dt-bindings/clock/tegra124-car.h>.
> +  <dt-bindings/clock/tegra124-car.h>. The following clocks do not exist
> +  in the nvidia,tegra132-car binding: TEGRA124_CLK_CCLK_G,
> +  TEGRA124_CLK_CCLK_LP, TEGRA124_CLK_PLL_X and TEGRA124_CLK_PLL_X_OUT0.

Perhaps it would be useful to split up the common clocks and the
Tegra124-only clocks into separate header files and then provide
tegra132-car.h which includes only the ones in common with Tegra124.

In other words: tegra124-car-common.h would have all except the ones
above, then tegra124-car.h includes tegra124-car-common.h and defines
those that are Tegra124-only (the ones you listed above) and
tegra132-car.h can include tegra124-car-common.h.

That's somewhat extreme, but it has the benefit of giving us compile-
time checks as to whether the correct clocks are being used.

Thierry

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