linux-kernel - Re: [PATCH v3 1/2] dt-bindings: i3c: Document MediaTek I3C master bindings

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Date:   Sat, 27 Jul 2019 09:23:33 +0800
From:   Qii Wang <qii.wang@...iatek.com>
To:     Rob Herring <robh@...nel.org>
CC:     <bbrezillon@...nel.org>, <matthias.bgg@...il.com>,
        <mark.rutland@....com>, <linux-i3c@...ts.infradead.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <leilk.liu@...iatek.com>,
        <liguo.zhang@...iatek.com>, <xinping.qian@...iatek.com>
Subject: Re: [PATCH v3 1/2] dt-bindings: i3c: Document MediaTek I3C master
 bindings

On Wed, 2019-07-24 at 14:21 -0600, Rob Herring wrote:
> On Tue, Jul 09, 2019 at 09:09:21PM +0800, Qii Wang wrote:
> > Document MediaTek I3C master DT bindings.
> > 
> > Signed-off-by: Qii Wang <qii.wang@...iatek.com>
> > ---
> >  .../devicetree/bindings/i3c/mtk,i3c-master.txt     |   48 ++++++++++++++++++++
> >  1 file changed, 48 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/i3c/mtk,i3c-master.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/i3c/mtk,i3c-master.txt b/Documentation/devicetree/bindings/i3c/mtk,i3c-master.txt
> > new file mode 100644
> > index 0000000..d32eda6
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/i3c/mtk,i3c-master.txt
> > @@ -0,0 +1,48 @@
> > +Bindings for MediaTek I3C master block
> > +=====================================
> > +
> > +Required properties:
> > +--------------------
> > +- compatible: shall be "mediatek,i3c-master"
> 
> Needs to be SoC specific.
> 

We hope that the SOCs will use the same driver and try to avoid big
changes. If there are inevitable changes in the future, then we will
modify the compatible to be SoC specific. cdns,i3c-master.txt is not SoC
specific either.

> > +- reg: physical base address of the controller and apdma base, length of
> > +  memory mapped region.
> > +- reg-names: shall be "main" for master controller and "dma" for apdma.
> > +- interrupts: the interrupt line connected to this I3C master.
> > +- clocks: shall reference the i3c and apdma clocks.
> > +- clock-names: shall include "main" and "dma".
> > +
> > +Mandatory properties defined by the generic binding (see
> > +Documentation/devicetree/bindings/i3c/i3c.txt for more details):
> > +
> > +- #address-cells: shall be set to 3
> > +- #size-cells: shall be set to 0
> > +
> > +Optional properties defined by the generic binding (see
> > +Documentation/devicetree/bindings/i3c/i3c.txt for more details):
> > +
> > +- i2c-scl-hz
> > +- i3c-scl-hz
> > +
> > +I3C device connected on the bus follow the generic description (see
> > +Documentation/devicetree/bindings/i3c/i3c.txt for more details).
> > +
> > +Example:
> > +
> > +	i3c0: i3c@...0d000 {
> > +		compatible = "mediatek,i3c-master";
> > +		reg = <0x1100d000 0x1000>,
> > +		      <0x11000300 0x80>;
> > +		reg-names = "main", "dma";
> > +		interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_LOW>;
> > +		clocks = <&infracfg CLK_INFRA_I3C0>,
> > +			 <&infracfg CLK_INFRA_AP_DMA>;
> > +		clock-names = "main", "dma";
> > +		#address-cells = <3>;
> > +		#size-cells = <0>;
> > +		i2c-scl-hz = <100000>;
> > +
> > +		nunchuk: nunchuk@52 {
> > +			compatible = "nintendo,nunchuk";
> > +			reg = <0x52 0x0 0x10>;
> > +		};
> > +	};
> > -- 
> > 1.7.9.5
> >