linux-kernel - Re: [PATCH v5 1/3] dt-bindings: Add I2C bindings for mt65xx/mt81xx.

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Message-ID: <20150323084505.GH9742@pengutronix.de>
Date:	Mon, 23 Mar 2015 09:45:05 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Eddie Huang <eddie.huang@...iatek.com>
Cc:	Wolfram Sang <wsa@...-dreams.de>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Mark Rutland <mark.rutland@....com>,
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
	David Box <david.e.box@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Jean Delvare <jdelvare@...e.de>,
	Xudong Chen <xudong.chen@...iatek.com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Arnd Bergmann <arnd@...db.de>,
	Liguo Zhang <liguo.zhang@...iatek.com>,
	Wei Yan <sledge.yanwei@...wei.com>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Neelesh Gupta <neelegup@...ux.vnet.ibm.com>,
	devicetree@...r.kernel.org, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Beniamino Galvani <b.galvani@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, srv_heupstream@...iatek.com,
	Anders Berg <anders.berg@...gotech.com>,
	Jim Cromie <jim.cromie@...il.com>,
	Simon Glass <sjg@...omium.org>,
	Max Schwarz <max.schwarz@...ine.de>,
	Doug Anderson <dianders@...omium.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH v5 1/3] dt-bindings: Add I2C bindings for mt65xx/mt81xx.

On Sat, Mar 21, 2015 at 02:05:20PM +0800, Eddie Huang wrote:
> From: Xudong Chen <xudong.chen@...iatek.com>
> 
> Add devicetree bindings for Mediatek Soc I2C driver.
> 
> Signed-off-by: Xudong Chen <xudong.chen@...iatek.com>
> Signed-off-by: Eddie Huang <eddie.huang@...iatek.com>
> ---
>  .../devicetree/bindings/i2c/i2c-mt6577.txt         | 41 ++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/i2c/i2c-mt6577.txt
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-mt6577.txt b/Documentation/devicetree/bindings/i2c/i2c-mt6577.txt
> new file mode 100644
> index 0000000..eff52c1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/i2c-mt6577.txt
> @@ -0,0 +1,41 @@
> +* Mediatek's I2C controller
> +
> +The Mediatek's I2C controller is used to interface with I2C devices.
> +
> +Required properties:
> +  - compatible: value should be either of the following.
> +      (a) "mediatek,mt6577-i2c", for i2c compatible with mt6577 i2c.
> +      (b) "mediatek,mt6589-i2c", for i2c compatible with mt6589 i2c.
> +      (c) "mediatek,mt8127-i2c", for i2c compatible with mt8127 i2c.
> +      (d) "mediatek,mt8135-i2c", for i2c compatible with mt8135 i2c.
> +      (e) "mediatek,mt8173-i2c", for i2c compatible with mt8173 i2c.
> +  - reg: physical base address of the controller and dma base, length of memory
> +    mapped region.
> +  - interrupts: interrupt number to the cpu.
> +  - clock-div: the fixed value for frequency divider of clock source in i2c
> +    module. Each IC may be different.
> +  - clocks: clock name from clock manager
> +  - clock-names: Must include "main" and "dma", if enable have-pmic need include
> +    "pmic" extra.
> +
> +Optional properties:
> +  - clock-frequency: Frequency in Hz of the bus when transfer, the default value
> +    is 100000.
> +  - mediatek,have-pmic: platform can control i2c form special pmic side.
> +    Only mt6589 and mt8135 support this feature.
> +  - mediatek,use-push-pull: IO config use push-pull mode.
> +
> +Example:
> +
> +	i2c0: i2c@...0d000 {
> +			compatible = "mediatek,mt6577-i2c";
> +			reg = <0x1100d000 0x70>,
> +			      <0x11000300 0x80>;
> +			interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_LOW>;
> +			clock-frequency = <100000>;

Since 100000 is the default you should probably pick another speed for
this example or drop the property.

Sascha

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