linux-kernel - Re: [PATCH v4 12/12] MIPS: Add basic support for the TL-WR1043ND version 1

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Date:	Mon, 8 Jun 2015 13:17:58 +0300
From:	Antony Pavlov <antonynpavlov@...il.com>
To:	Alban Bedel <albeu@...e.fr>
Cc:	linux-mips@...ux-mips.org, 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>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Qais Yousef <qais.yousef@...tec.com>,
	Gabor Juhos <juhosg@...nwrt.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 12/12] MIPS: Add basic support for the TL-WR1043ND
 version 1

On Sun, 31 May 2015 02:18:26 +0200
Alban Bedel <albeu@...e.fr> wrote:

> Add a DTS for TL-WR1043ND version 1 and allow to have it built in the
> kernel to circumvent the broken u-boot found on these boards.
> Currently only the UART, LEDs and buttons are supported.
> 
> Signed-off-by: Alban Bedel <albeu@...e.fr>

> --- /dev/null
> +++ b/arch/mips/boot/dts/qca/ar9132.dtsi


> +++ b/arch/mips/boot/dts/qca/ar9132_tl_wr1043nd_v1.dts
> @@ -0,0 +1,112 @@
> +/dts-v1/;
> +
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/input/input.h>
> +
> +#include "ar9132.dtsi"
> +
> +/ {
> +	compatible = "tplink,tl-wr1043nd-v1", "qca,ar9132";
> +	model = "TP-Link TL-WR1043ND Version 1";
> +
> +	alias {
> +		serial0 = "/ahb/apb/uart@...20000";
> +	};
> +
> +	memory@0 {
> +		device_type = "memory";
> +		reg = <0x0 0x2000000>;
> +	};
> +
> +	extosc: oscillator {
> +		compatible = "fixed-clock";
> +		#clock-cells = <0>;
> +		clock-frequency = <40000000>;
> +	};
> +
> +	ahb {
> +		apb {
> +			uart@...20000 {
> +				status = "okay";
> +			};
> +
> +			pll-controller@...50000 {
> +				clocks = <&extosc>;

IMHO AR9132 SoC can't work without external oscilator.

Can we just move basic extosc declaration to SoC dt file (ar9132.dtsi)?
So board dt file ar9132_tl_wr1043nd_v1.dts will contain only oscilator
clock frequency value.

E.g.

ar9132.dtsi:
============

	extosc: oscillator {
		compatible = "fixed-clock";
		#clock-cells = <0>;
		clock-frequency = <40000000>;
	};
...
	ahb {
		apb {

...

			pll-controller@...50000 {
...
				clocks = <&extosc>;
...



ar9132_tl_wr1043nd_v1.dts:
==========================

...
	&extosc {
		clock-frequency = <40000000>;
	};


-- 
Best regards,
  Antony Pavlov
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