linux-kernel - Re: [RESEND PATCH v2 2/6] ARM: dts: Specify clocks for UARTs on bcm11351

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Message-ID: <20131017135602.GD24056@e106331-lin.cambridge.arm.com>
Date:	Thu, 17 Oct 2013 14:56:02 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Tim Kryger <tim.kryger@...aro.org>
Cc:	Christian Daudt <bcm@...thebug.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Pawel Moll <Pawel.Moll@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Chris Ball <cjb@...top.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>
Subject: Re: [RESEND PATCH v2 2/6] ARM: dts: Specify clocks for UARTs on
 bcm11351

On Wed, Oct 16, 2013 at 10:47:06PM +0100, Tim Kryger wrote:
> Rather than declaring the frequency of the external clock, specify the
> label of the clock such that the driver may determine the frequency on
> its own.

Nit: we're not specifying the label of the clock. Clocks are represented
py a phand+args pair, and the important part is that we're specifying
the clock itself.

How about something like:

---->8----
Currently the rate of the external clock input to "snps,dw-apb-uart"
devices is described by a clock-frequency property rather than by
reference to the clock itself.

This patch changes the "snps,dw-apb-uart" entries in bcm11351.dtsi to
refer to the parent clock directly, following the common clock bindings.
---->8----

Also, this should probably be moved after the driver change, so as to
not be unbootable temporarily.

Thanks,
Mark.

> 
> Signed-off-by: Tim Kryger <tim.kryger@...aro.org>
> Reviewed-by: Markus Mayer <markus.mayer@...aro.org>
> Reviewed-by: Matt Porter <matt.porter@...aro.org>
> ---
>  arch/arm/boot/dts/bcm11351.dtsi | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/bcm11351.dtsi b/arch/arm/boot/dts/bcm11351.dtsi
> index c6464fb..ce65367 100644
> --- a/arch/arm/boot/dts/bcm11351.dtsi
> +++ b/arch/arm/boot/dts/bcm11351.dtsi
> @@ -43,7 +43,7 @@
>  		compatible = "brcm,bcm11351-dw-apb-uart", "snps,dw-apb-uart";
>  		status = "disabled";
>  		reg = <0x3e000000 0x1000>;
> -		clock-frequency = <13000000>;
> +		clocks = <&uartb_clk>;
>  		interrupts = <GIC_SPI 67 IRQ_TYPE_LEVEL_HIGH>;
>  		reg-shift = <2>;
>  		reg-io-width = <4>;
> @@ -53,7 +53,7 @@
>  		compatible = "brcm,bcm11351-dw-apb-uart", "snps,dw-apb-uart";
>  		status = "disabled";
>  		reg = <0x3e001000 0x1000>;
> -		clock-frequency = <13000000>;
> +		clocks = <&uartb2_clk>;
>  		interrupts = <GIC_SPI 66 IRQ_TYPE_LEVEL_HIGH>;
>  		reg-shift = <2>;
>  		reg-io-width = <4>;
> @@ -63,7 +63,7 @@
>  		compatible = "brcm,bcm11351-dw-apb-uart", "snps,dw-apb-uart";
>  		status = "disabled";
>  		reg = <0x3e002000 0x1000>;
> -		clock-frequency = <13000000>;
> +		clocks = <&uartb3_clk>;
>  		interrupts = <GIC_SPI 65 IRQ_TYPE_LEVEL_HIGH>;
>  		reg-shift = <2>;
>  		reg-io-width = <4>;
> @@ -73,7 +73,7 @@
>  		compatible = "brcm,bcm11351-dw-apb-uart", "snps,dw-apb-uart";
>  		status = "disabled";
>  		reg = <0x3e003000 0x1000>;
> -		clock-frequency = <13000000>;
> +		clocks = <&uartb4_clk>;
>  		interrupts = <GIC_SPI 64 IRQ_TYPE_LEVEL_HIGH>;
>  		reg-shift = <2>;
>  		reg-io-width = <4>;
> -- 
> 1.8.0.1
> 
> 
> 
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