linux-kernel - Re: [PATCH V2 1/3] phy: Add binding document for Pistachio USB2.0 PHY

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Date:	Tue, 5 May 2015 23:01:17 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	Andrew Bresticker <abrestic@...omium.org>
CC:	Ralf Baechle <ralf@...ux-mips.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	<devicetree@...r.kernel.org>, <linux-mips@...ux-mips.org>,
	<linux-kernel@...r.kernel.org>,
	James Hartley <james.hartley@...tec.com>,
	Damien Horsley <Damien.Horsley@...tec.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>
Subject: Re: [PATCH V2 1/3] phy: Add binding document for Pistachio USB2.0 PHY

Hi Andrew,

On Tue, Apr 07, 2015 at 03:04:16PM -0700, Andrew Bresticker wrote:
> Add a binding document for the USB2.0 PHY found on the IMG Pistachio SoC.
> 
> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Pawel Moll <pawel.moll@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Ian Campbell <ijc+devicetree@...lion.org.uk>
> Cc: Kumar Gala <galak@...eaurora.org>
> ---
> No changes from v1.
> ---
>  .../devicetree/bindings/phy/pistachio-usb-phy.txt  | 29 ++++++++++++++++++++++
>  include/dt-bindings/phy/phy-pistachio-usb.h        | 16 ++++++++++++
>  2 files changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/pistachio-usb-phy.txt
>  create mode 100644 include/dt-bindings/phy/phy-pistachio-usb.h
> 
> diff --git a/Documentation/devicetree/bindings/phy/pistachio-usb-phy.txt b/Documentation/devicetree/bindings/phy/pistachio-usb-phy.txt
> new file mode 100644
> index 0000000..afbc7e2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/pistachio-usb-phy.txt
> @@ -0,0 +1,29 @@
> +IMG Pistachio USB PHY
> +=====================
> +
> +Required properties:
> +--------------------
> + - compatible: Must be "img,pistachio-usb-phy".
> + - #phy-cells: Must be 0.  See ./phy-bindings.txt for details.
> + - clocks: Must contain an entry for each entry in clock-names.
> +   See ../clock/clock-bindings.txt for details.
> + - clock-names: Must include "usb_phy".
> + - img,cr-top: Must constain a phandle to the CR_TOP syscon node.
> + - img,refclk: Indicates the reference clock source for the USB PHY.
> +   See <dt-bindings/phy/phy-pistachio-usb.h> for a list of valid values.

Possibly dumb question: why isn't the reference clock source specified
in the normal ways like the "usb_phy" clock is?

Does the value required here depend on what usb_phy clock gets muxed
from or something?

Cheers
James

> +
> +Optional properties:
> +--------------------
> + - phy-supply: USB VBUS supply.  Must supply 5.0V.
> +
> +Example:
> +--------
> +usb_phy: usb-phy {
> +	compatible = "img,pistachio-usb-phy";
> +	clocks = <&clk_core CLK_USB_PHY>;
> +	clock-names = "usb_phy";
> +	phy-supply = <&usb_vbus>;
> +	img,refclk = <REFCLK_CLK_CORE>;
> +	img,cr-top = <&cr_top>;
> +	#phy-cells = <0>;
> +};
> diff --git a/include/dt-bindings/phy/phy-pistachio-usb.h b/include/dt-bindings/phy/phy-pistachio-usb.h
> new file mode 100644
> index 0000000..d1877aa
> --- /dev/null
> +++ b/include/dt-bindings/phy/phy-pistachio-usb.h
> @@ -0,0 +1,16 @@
> +/*
> + * Copyright (C) 2015 Google, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + */
> +
> +#ifndef _DT_BINDINGS_PHY_PISTACHIO
> +#define _DT_BINDINGS_PHY_PISTACHIO
> +
> +#define REFCLK_XO_CRYSTAL	0x0
> +#define REFCLK_X0_EXT_CLK	0x1
> +#define REFCLK_CLK_CORE		0x2
> +
> +#endif /* _DT_BINDINGS_PHY_PISTACHIO */
> -- 
> 2.2.0.rc0.207.ga3a616c
> 
> 

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