linux-kernel - Re: [PATCH 2/2] ARM: dts: enable init rate for clock

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Date:	Tue, 7 Oct 2014 10:03:19 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Kever Yang <kever.yang@...k-chips.com>
Cc:	Heiko Stübner <heiko@...ech.de>,
	Mike Turquette <mturquette@...aro.org>,
	Sonny Rao <sonnyrao@...omium.org>,
	Addy Ke <addy.ke@...k-chips.com>,
	Eddie Cai <cf@...k-chips.com>, Jianqun Xu <xjq@...k-chips.com>,
	han jiang <hj@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>,
	戴克霖 (Jack) <dkl@...k-chips.com>,
	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>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-rockchip@...ts.infradead.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ARM: dts: enable init rate for clock

Kever,

On Tue, Oct 7, 2014 at 2:33 AM, Kever Yang <kever.yang@...k-chips.com> wrote:
> We need to initialize PLL rate and some of bus clock rate while
> kernel init, for there is no other module will do that.
>
> Signed-off-by: Kever Yang <kever.yang@...k-chips.com>
> ---
>
>  arch/arm/boot/dts/rk3288.dtsi | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
> index 874e66d..2f4519b 100644
> --- a/arch/arm/boot/dts/rk3288.dtsi
> +++ b/arch/arm/boot/dts/rk3288.dtsi
> @@ -455,6 +455,16 @@
>                 rockchip,grf = <&grf>;
>                 #clock-cells = <1>;
>                 #reset-cells = <1>;
> +               assigned-clocks = <&cru PLL_GPLL>, <&cru PLL_CPLL>,
> +                                 <&cru PLL_NPLL>, <&cru ACLK_CPU>,
> +                                 <&cru HCLK_CPU>, <&cru PCLK_CPU>,
> +                                 <&cru ACLK_PERI>, <&cru HCLK_PERI>,
> +                                 <&cru PCLK_PERI>;
> +               assigned-clock-rates = <594000000>, <400000000>,
> +                                      <500000000>, <300000000>,

When I boot up, I see that ACLK_CPU was 297000000.  You specified
300000000.  Did you expect to get 300?  If you expected 297, I think
you should put 297.  If you expected 300 then we have some debugging
to do.  Note: I'm not quite sure how you'd expect to get 300 given
that none of the PLLs divide evenly to 300...


> +                                      <150000000>, <75000000>,

Similarly, I see 148500000, 74250000

> +                                      <300000000>, <150000000>,

297000000, 148500000

> +                                      <75000000>;

74250000

>         };
>
>         grf: syscon@...70000 {
> --
> 1.9.1
>
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