linux-kernel - Re: [PATCH 03/14] DEVICETREE: Add PIC32 clock binding documentation

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Date:	Sat, 21 Nov 2015 21:49:20 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Joshua Henderson <joshua.henderson@...rochip.com>
Cc:	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	Purna Chandra Mandal <purna.mandal@...rochip.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>, devicetree@...r.kernel.org
Subject: Re: [PATCH 03/14] DEVICETREE: Add PIC32 clock binding documentation

On Friday 20 November 2015 17:17:15 Joshua Henderson wrote:
> +/* PIC32 specific clks */
> +pic32_clktree {
> +       #address-cells = <1>;
> +       #size-cells = <1>;
> +       reg = <0x1f801200 0x200>;
> +       compatible = "microchip,pic32-clk";
> +       interrupts = <12>;
> +       ranges;
> +
> +       /* secondary oscillator; external input on SOSCI pin */
> +       SOSC:sosc_clk {
> +               #clock-cells = <0>;
> +               compatible = "microchip,pic32-sosc";
> +               clock-frequency = <32768>;
> +               reg = <0x1f801200 0x10   /* enable reg */
> +                       0x1f801390 0x10>; /* status reg */
> +               microchip,bit-mask = <0x02>; /* enable mask */
> +               microchip,status-bit-mask = <0x10>; /* status-mask*/
> +       };
> 

If you want to use the reg property in this way for each cell,
at least use a 'ranges' that only translates the actual registers
like this

	ranges = <0 0x1f801200 0x200>

	sosc_clk {
		...
		reg = <0x000 0x10>, <0x190 0x10>;
		...
	};

	Arnd
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