linux-kernel - Re: [PATCH v3 1/3] phy: Add exynos-simple-phy driver

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Date:	Wed, 14 May 2014 22:01:49 +0200
From:	Tomasz Figa <tomasz.figa@...il.com>
To:	Rahul Sharma <rahul.sharma@...sung.com>,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
CC:	a.hajda@...sung.com, t.stanislaws@...sung.com,
	devicetree@...r.kernel.org, kgene.kim@...sung.com, kishon@...com,
	kyungmin.park@...sung.com, robh+dt@...nel.org,
	grant.likely@...aro.org, sylvester.nawrocki@...il.com,
	joshi@...sung.com
Subject: Re: [PATCH v3 1/3] phy: Add exynos-simple-phy driver

Hi Rahul, Tomasz,

On 14.05.2014 21:17, Rahul Sharma wrote:
> From: Tomasz Stanislawski <t.stanislaws@...sung.com>
> 
> Add exynos-simple-phy driver to support a single register
> PHY interfaces present on Exynos4 SoC.
> 
> Signed-off-by: Tomasz Stanislawski <t.stanislaws@...sung.com>
> Signed-off-by: Rahul Sharma <Rahul.Sharma@...sung.com>
> 
> ---
>  .../devicetree/bindings/phy/samsung-phy.txt        |   56 ++++++
>  drivers/phy/Kconfig                                |    5 +
>  drivers/phy/Makefile                               |    1 +
>  drivers/phy/exynos-simple-phy.c                    |  189 ++++++++++++++++++++
>  include/dt-bindings/phy/exynos-simple-phy.h        |   27 +++
>  5 files changed, 278 insertions(+)
>  create mode 100644 drivers/phy/exynos-simple-phy.c
>  create mode 100644 include/dt-bindings/phy/exynos-simple-phy.h
> 
> diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt b/Documentation/devicetree/bindings/phy/samsung-phy.txt
> index 2049261..12ad9cf 100644
> --- a/Documentation/devicetree/bindings/phy/samsung-phy.txt
> +++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt
> @@ -161,3 +161,59 @@ Example:
>  		usbdrdphy0 = &usb3_phy0;
>  		usbdrdphy1 = &usb3_phy1;
>  	};
> +
> +Samsung S5P/EXYNOS SoC series SIMPLE PHY
> +-------------------------------------------------
> +
> +Required properties:
> +- compatible : should be one of the listed compatibles:
> +	- "samsung,exynos4210-simple-phy"
> +	- "samsung,exynos4412-simple-phy"
> +	- "samsung,exynos5250-simple-phy"
> +	- "samsung,exynos5420-simple-phy"
> +- samsung,pmureg-phandle - handle to syscon to control PMU registers
> +- #phy-cells : from the generic phy bindings, must be 1;
> +
> +For "samsung,exynos4210-simple-phy" compatible PHYs the second cell in
> +the PHY specifier identifies the PHY and the supported phys for exynos4210
> +are:
> +  HDMI_PHY,
> +  DAC_PHY,
> +  ADC_PHY,
> +  PCIE_PHY,
> +  SATA_PHY.
> +
> +For "samsung,exynos4412-simple-phy" compatible PHYs the second cell in
> +the PHY specifier identifies the PHY and the supported phys for exynos4412
> +are:
> +  HDMI_PHY,
> +  ADC_PHY.
> +
> +For "samsung,exynos5250-simple-phy" compatible PHYs the second cell in
> +the PHY specifier identifies the PHY and the supported phys for exynos5250
> +are:
> +  HDMI_PHY,
> +  ADC_PHY,
> +  SATA_PHY.
> +
> +For "samsung,exynos5420-simple-phy" compatible PHYs the second cell in
> +the PHY specifier identifies the PHY and the supported phys for exynos5420
> +are:
> +  HDMI_PHY,
> +  ADC_PHY.
> +
> +Example:
> +Simple PHY provider node:
> +
> +	simplephys: simple-phys@...40000 {
> +		compatible = "samsung,exynos5250-simple-phy";

Missing reg property or unnecessary @unit-address suffix in node name.

> +		samsung,pmu-syscon = <&pmu_system_controller>;
> +		#phy-cells = <1>;
> +	};

In general, the idea is quite good, but I think this should rather bind
to the main PMU node, since this is just a part of the PMU, not another
device in the system. This also means that the PMU node itself should be
the PHY provider.

Otherwise looks good.

Best regards,
Tomasz
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