linux-kernel - Re: [PATCH v2] Documentation: dt: bindings: TI WiLink modules

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Date:	Tue, 30 Jul 2013 20:24:34 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Luciano Coelho <coelho@...com>
Cc:	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	mturquette@...aro.org, mark.rutland@....com, balbi@...com,
	grant.likely@...aro.org, rob.herring@...xeda.com,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-wireless@...r.kernel.org, linux-arm@...r.kernel.org,
	tony@...mide.com, nm@...com
Subject: Re: [PATCH v2] Documentation: dt: bindings: TI WiLink modules

Hi Luciano,

Thank you for the patch.

On Monday 29 July 2013 17:55:28 Luciano Coelho wrote:
> Add device tree bindings documentation for the TI WiLink modules.
> Currently only the WLAN part of the WiLink6, WiLink7 and WiLink8
> modules is supported.
> 
> Signed-off-by: Luciano Coelho <coelho@...com>
> ---
> 
> Changes in v2:
> 
> Use generic clock definitions to get the clock data instead of passing
> the frequencies directly.  Also added definition for "internal"
> ti,wilink-clock.
> 
> Please review.

The proposal looks good to me, I just have one small comment.

>  .../devicetree/bindings/net/wireless/ti-wilink.txt | 68 +++++++++++++++++++
>  1 file changed, 68 insertions(+)
>  create mode 100644
> Documentation/devicetree/bindings/net/wireless/ti-wilink.txt
> 
> diff --git a/Documentation/devicetree/bindings/net/wireless/ti-wilink.txt
> b/Documentation/devicetree/bindings/net/wireless/ti-wilink.txt new file
> mode 100644
> index 0000000..5fd27dc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/wireless/ti-wilink.txt
> @@ -0,0 +1,68 @@
> +TI WiLink Wireless Modules Device Tree Bindings
> +===============================================
> +
> +The WiLink modules provide wireless connectivity, such as WLAN,
> +Bluetooth, FM and NFC.
> +
> +There are several different modules available, which can be grouped by
> +their generation: WiLink6, WiLink7 and WiLink8.  WiLink4 is not
> +currently supported with device tree.
> +
> +Currently, only the WLAN portion of the modules is supported with
> +device tree.
> +
> +Required properties:
> +--------------------
> +
> +- compatible: should be "ti,wilink6", "ti,wilink7" or "ti,wilink8"
> +- interrupt-parent: the interrupt controller
> +- interrupts: out-of-band WLAN interrupt
> +	See the interrupt controller's bindings documentation for
> +	detailed definition.
> +
> +Optional properties:
> +--------------------
> +
> +- clocks: list of clocks needed by the chip as follows:
> +
> +  refclock: the internal WLAN reference clock frequency (required for
> +	WiLink6 and WiLink7; not used for WiLink8).
> +
> +  tcxoclock: the internal WLAN TCXO clock frequency (required for
> +	WiLink7 not used for WiLink6 and WiLink8).
> +
> +  The clocks must be defined and named accordingly.  For example:
> +
> +  clocks = <&refclock>
> +  clock-names = "refclock";
> +
> +  refclock: refclock {
> +		     compatible = "ti,wilink-clock";
> +		     #clock-cells = <0>;
> +		     clock-frequency = <38400000>;
> +	};
> +
> +  Some modules that contain the WiLink chip provide clocks in the
> +  module itself.  In this case, we define a "ti,wilink-clock" as shown
> +  above.  But any other clock could in theory be used, so the proper
> +  clock definition should be used.
> +
> +
> +Example:
> +--------
> +
> +Example definition that can be used in OMAP4 Panda:
> +
> +wlan {
> +	compatible = "ti,wilink6";
> +	interrupt-parent = <&gpio2>;
> +	interrupts = <21 0x4>;	/* gpio line 53, high level triggered */

Could you please use the IRQ_TYPE_LEVEL_HIGH macro (defined in <dt-
bindings/interrupt-controller/irq.h>) instead of the hardcode 0x4 constant ?

> +	clocks = <&refclock>;
> +	clock-names = "refclock";
> +
> +	refclock: refclock {
> +		compatible = "ti,wilink-clock";
> +		#clock-cells = <0>;
> +		clock-frequency = <38400000>;
> +	};
> +};
-- 
Regards,

Laurent Pinchart

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