linux-kernel - Re: [PATCH v2 4/5] dt-bindings: devfreq: rk3399_dmc: remove interrupts as is not required.

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Message-ID: <20180427200029.elq3drn46nkwbvf2@rob-hp-laptop>
Date:   Fri, 27 Apr 2018 15:00:29 -0500
From:   Rob Herring <robh@...nel.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        devicetree@...r.kernel.org, ulf.hansson@...aro.org,
        heiko@...ech.de, linux-pm@...r.kernel.org, dbasehore@...omium.org,
        linux-kernel@...r.kernel.org, dianders@...gle.com,
        groeck@...omium.org, kernel@...labora.com, hl@...k-chips.com,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v2 4/5] dt-bindings: devfreq: rk3399_dmc: remove
 interrupts as is not required.

On Tue, Apr 24, 2018 at 10:37:41AM +0200, Enric Balletbo i Serra wrote:
> In ATF we already wait for DDR dvfs finish, so don't need to do this in
> kernel, so remove the interrupts properties as is not longer required.

If the hardware has an interrupt, then the DT should have one. The 
partitioning with ATF shouldn't matter.

Now, if you want to make ATF remove the interrupt, then maybe that is 
okay. But it's not clear to me why you'd expose some of the h/w and not 
all.

> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
> ---
> 
> Changes in v2:
> - [4/6] Add Reviewed-by Chanwoo Choi.
> 
>  Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
> index 834637c7bae7..e7f0ef9548b7 100644
> --- a/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
> +++ b/Documentation/devicetree/bindings/devfreq/rk3399_dmc.txt
> @@ -5,10 +5,6 @@ Required properties:
>  - devfreq-events:	 Node to get DDR loading, Refer to
>  			 Documentation/devicetree/bindings/devfreq/event/
>  			 rockchip-dfi.txt
> -- interrupts:		 The CPU interrupt number. The interrupt specifier
> -			 format depends on the interrupt controller.
> -			 It should be a DCF interrupt. When DDR DVFS finishes
> -			 a DCF interrupt is triggered.
>  - clocks:		 Phandles for clock specified in "clock-names" property
>  - clock-names :		 The name of clock used by the DFI, must be
>  			 "pclk_ddr_mon";
> @@ -172,7 +168,6 @@ Example:
>  	dmc: dmc {
>  		compatible = "rockchip,rk3399-dmc";
>  		devfreq-events = <&dfi>;
> -		interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>;
>  		clocks = <&cru SCLK_DDRCLK>;
>  		clock-names = "dmc_clk";
>  		operating-points-v2 = <&dmc_opp_table>;
> -- 
> 2.17.0
>