linux-kernel - Re: [PATCH v2 3/9] arm: twr-k70f120m: clock driver for Kinetis SoC

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Date:	Tue, 30 Jun 2015 22:36:38 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Paul Osmialowski <pawelo@...g.net.pl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Jiri Slaby <jslaby@...e.cz>, Kumar Gala <galak@...eaurora.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Michael Turquette <mturquette@...libre.com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-gpio@...r.kernel.org, linux-serial@...r.kernel.org,
	devicetree@...r.kernel.org, dmaengine@...r.kernel.org,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Sergei Poselenov <sposelenov@...raft.com>,
	Paul Bolle <pebolle@...cali.nl>,
	Jingchang Lu <jingchang.lu@...escale.com>,
	Yuri Tikhonov <yur@...raft.com>,
	Rob Herring <r.herring@...escale.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Uwe Kleine-Koenig <u.kleine-koenig@...gutronix.de>,
	Alexander Potashev <aspotashev@...raft.com>,
	Frank Li <Frank.Li@...escale.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Anson Huang <b20788@...escale.com>
Subject: Re: [PATCH v2 3/9] arm: twr-k70f120m: clock driver for Kinetis SoC

On Tuesday 30 June 2015 14:27:24 Paul Osmialowski wrote:
> Based on K70P256M150SF3RM.pdf K70 Sub-Family Reference Manual, Rev. 3.
> 
> Signed-off-by: Paul Osmialowski <pawelo@...g.net.pl>
> ---
>  .../devicetree/bindings/clock/kinetis-clock.txt    |  63 +++
>  arch/arm/boot/dts/kinetis.dtsi                     |  36 ++
>  drivers/clk/Makefile                               |   1 +
>  drivers/clk/clk-kinetis.c                          | 463 +++++++++++++++++++++
>  4 files changed, 563 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/kinetis-clock.txt
>  create mode 100644 drivers/clk/clk-kinetis.c
> 
> diff --git a/Documentation/devicetree/bindings/clock/kinetis-clock.txt b/Documentation/devicetree/bindings/clock/kinetis-clock.txt
> new file mode 100644
> index 0000000..63af6a5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/kinetis-clock.txt
> @@ -0,0 +1,63 @@
> +* Clock bindings for Freescale Kinetis SoC
> +
> +Required properties:
> +- compatible: Should be "fsl,kinetis-cmu".
> +- reg: Two address ranges, one for the Clock Genetator register set,
> +	one for System Integration Module register set.
> +- Set of clock devices: one fixed-rate-root, fixed-rate clocks and clock-gates.
> +
> +For clock-gate addresses see K70 Sub-Family Reference Manual, Rev. 3 pg. 341
> +and later. Notice that addresses are zero-based, so SIM_SCGC1 has address 0,
> +SIM_SCGC2 has address 1 and so on. The second address component is the bit
> +index.

Please document the sub-nodes that are allowed, and the format
of the clock specifiers.

> +
> +Example:
> +
> +cmu@...64000 {
> +	compatible = "fsl,kinetis-cmu";
> +	reg = <0x40064000 0x14>, <0x40047000 0x1100>;
> +
> +	mcg_outclk: fixed-rate-root@...out {
> +		device_type = "mcgout";
> +		#clock-cells = <0>;
> +	};
> +
> +	mcg_cclk: fixed-rate@...k {

'@' is a reserved character here that is used before the address
of the device, so this has to be a hexadecimal number without leading
'0x', and it should match the 'reg' property of the device.

> +		device_type = "cclk";
> +		#clock-cells = <0>;
> +		clocks = <&mcg_outclk>;
> +	};

The device_type property here is not a standard identifier,
and you don't list it as an optional or mandatory property.

Please remove it and instead use the compatible property, the
name or the address.

	Arnd

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