linux-kernel - Re: [PATCH V4 1/5] phy: Add new Exynos5 USB 3.0 PHY driver

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Message-id: <534BF28E.7040906@samsung.com>
Date:	Mon, 14 Apr 2014 16:37:02 +0200
From:	Sylwester Nawrocki <s.nawrocki@...sung.com>
To:	Vivek Gautam <gautam.vivek@...sung.com>
Cc:	linux-usb@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	kishon@...com, gregkh@...uxfoundation.org, balbi@...com,
	kgene.kim@...sung.com, t.figa@...sung.com, k.debski@...sung.com,
	jg1.han@...sung.com
Subject: Re: [PATCH V4 1/5] phy: Add new Exynos5 USB 3.0 PHY driver

On 08/04/14 16:36, Vivek Gautam wrote:
> diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt b/Documentation/devicetree/bindings/phy/samsung-phy.txt
> index 28f9edb..6d99ba9 100644
> --- a/Documentation/devicetree/bindings/phy/samsung-phy.txt
> +++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt
> @@ -74,3 +74,45 @@ phy-consumer@...40000 {
>  
>  Refer to DT bindings documentation of particular PHY consumer devices for more
>  information about required PHYs and the way of specification.
> +
> +Samsung Exynos5 SoC series USB DRD PHY controller
> +--------------------------------------------------
> +
> +Required properties:
> +- compatible : Should be set to one of the following supported values:
> +	- "samsung,exynos5250-usbdrd-phy" - for exynos5250 SoC,
> +	- "samsung,exynos5420-usbdrd-phy" - for exynos5420 SoC.
> +- reg : Register offset and length of USB DRD PHY register set;
> +- clocks: Clock IDs array as required by the controller
> +- clock-names: names of clocks correseponding to IDs in the clock property;
> +	       Required clocks:
> +	- phy: main PHY clock (same as USB DRD controller i.e. DWC3 IP clock),
> +	       used for register access.
> +	- ref: PHY's reference clock (usually crystal clock), associated by
> +	       phy name, used to determine bit values for clock settings
> +	       register.
> +	Additional clock required for Exynos5420:
> +	- usb30_sclk_100m: Additional special clock used for PHY operation
> +			   depicted as 'sclk_usbphy30' in CMU of Exynos5420.
> +- samsung,syscon-phandle: phandle for syscon interface, which is used to
> +			  control pmu registers for power isolation.

Why to append "-phandle" to the property's name ? If this is for PMU
perhaps make it more explicit and name it: samsung,pmu-syscon or
samsung,pmureg ?

> +- samsung,pmu-offset: phy power control register offset to pmu-system-controller
> +		      base.
> +- #phy-cells : from the generic PHY bindings, must be 1;
> +
> +For "samsung,exynos5250-usbdrd-phy" and "samsung,exynos5420-usbdrd-phy"
> +compatible PHYs, the second cell in the PHY specifier identifies the
> +PHY id, which is interpreted as follows:
> +  0 - UTMI+ type phy,
> +  1 - PIPE3 type phy,

-- 
Thanks,
Sylwester
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