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

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Date:	Fri, 31 Oct 2014 09:38:29 +0800
From:	xudong chen <xudong.chen@...iatek.com>
To:	Matthias Brugger <matthias.bgg@...il.com>
CC:	Mark Rutland <mark.rutland@....com>, <arm@...nel.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	"Sascha Hauer" <kernel@...gutronix.de>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"Kumar Gala" <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	"Grant Likely" <grant.likely@...aro.org>,
	Jean Delvare <jdelvare@...e.de>,
	"Arnd Bergmann" <arnd@...db.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-i2c@...r.kernel.org>,
	"Yingjoe Chen" <yingjoe.chen@...iatek.com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	Nathan Chung <nathan.chung@...iatek.com>,
	YH Chen <yh.chen@...iatek.com>
Subject: Re: [PATCH 1/3] dt-bindings: Add I2C bindings for mt65xx/mt81xx.

On Thu, 2014-10-30 at 13:38 +0100, Matthias Brugger wrote:
> 2014-10-29 6:37 GMT+01:00 Xudong Chen <xudong.chen@...iatek.com>:
> > Add devicetree bindings for Mediatek Soc I2C driver.
> >
> > Signed-off-by: Xudong Chen <xudong.chen@...iatek.com>
> > ---
> >  .../devicetree/bindings/i2c/i2c-mt6577.txt         | 37 ++++++++++++++++++++++
> >  1 file changed, 37 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..b4012c8
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/i2c/i2c-mt6577.txt
> > @@ -0,0 +1,37 @@
> > +* 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) "mtk,mt6577-i2c", for i2c compatible with mt6577 i2c.
> 
> Looking on the datasheet of mt6577 it does not seem that this driver
> is really compatible.
> I was not able to find the PATH_DIR register neither in the datasheet
> nor in the source code.
> 
Hi, 

The PATH_DIR register named OFFSET_PATH_DIR(0x60) in the source code.
Only MT8135 supports this feature, so it does not contained in mt6577
datasheet.
I will modify the comment.

> > +      (b) "mtk,mt8127-i2c", for i2c compatible with mt8127 i2c.
> > +      (c) "mtk,mt8135-i2c", for i2c compatible with mt8135 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: clock name used in i2c driver probe
> > +
> > +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.

I will change this to: 
 - mediatek,have-pmic: platform can control i2c form special pmic side,
only MT8135 supports this.

Is this OK?
 
> > +  - mediatek,have-dcm: platform has DCM(hardware digital clock manager) property.
> > +  - mediatek,use-push-pull: IO 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>;
> > +                       mediatek,have-pmic;
> > +                       clock-div = <16>;
> > +                       clocks = <&i2c0_ck>, <&ap_dma_ck>;
> > +                       clock-names = "main", "dma";
> > +       };
> > +
> > --
> > 1.8.1.1.dirty
> >
> 
> 
> 


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