linux-kernel - RE: [PATCH v2] arm/dts: AM33XX: Add SPI device tree data

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Date:	Fri, 19 Oct 2012 10:01:39 +0000
From:	"Philip, Avinash" <avinashphilip@...com>
To:	"Cousson, Benoit" <b-cousson@...com>
CC:	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"tony@...mide.com" <tony@...mide.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"Nori, Sekhar" <nsekhar@...com>,
	"Hebbar, Gururaja" <gururaja.hebbar@...com>
Subject: RE: [PATCH v2] arm/dts: AM33XX: Add SPI device tree data

On Fri, Oct 19, 2012 at 13:54:15, Cousson, Benoit wrote:
> Hi Avinash,
> 
> This look good to me except the: status = "disabled".

status = "disabled" in soc .dtsi  file to make sure that IP driver
won't loaded unless if IP used. 
So from board .dts file status = "okay" should be set if IP being used.

Follows the uart1 case in AM33xx dtsi.

uart1 also sets status = "disabled"; in am33xx.dtsi & set status = "okay";
in am335x-evm.dts.

Thanks
Avinash

> 
> The "disabled" should be reserved for variant that does not contain the IP.
> Is it the case here?
> 
> Regards,
> Benoit
> 
> On 09/18/2012 07:30 AM, Philip, Avinash wrote:
> > Add McSPI data node to AM33XX device tree file. The McSPI module (and so
> > as the driver) is reused from OMAP4.
> > 
> > Signed-off-by: Philip, Avinash <avinashphilip@...com>
> > Tested-by: Matt Porter <mporter@...com>
> > ---
> > Changes since v1:
> >         - Corrected reg offset in reg DT entry.
> > 
> > :100644 100644 ff3badb... 065fd54... M	arch/arm/boot/dts/am33xx.dtsi
> >  arch/arm/boot/dts/am33xx.dtsi |   25 +++++++++++++++++++++++++
> >  1 files changed, 25 insertions(+), 0 deletions(-)
> > 
> > diff --git a/arch/arm/boot/dts/am33xx.dtsi b/arch/arm/boot/dts/am33xx.dtsi
> > index ff3badb..065fd54 100644
> > --- a/arch/arm/boot/dts/am33xx.dtsi
> > +++ b/arch/arm/boot/dts/am33xx.dtsi
> > @@ -219,5 +219,30 @@
> >  			interrupt-parent = <&intc>;
> >  			interrupts = <91>;
> >  		};
> > +
> > +		spi0: spi@...30000 {
> > +			compatible = "ti,omap4-mcspi";
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +			reg = <0x48030000 0x400>;
> > +			interrupt-parent = <&intc>;
> > +			interrupt = <65>;
> > +			ti,spi-num-cs = <2>;
> > +			ti,hwmods = "spi0";
> > +			status = "disabled";
> > +
> > +		};
> > +
> > +		spi1: spi@...a0000 {
> > +			compatible = "ti,omap4-mcspi";
> > +			#address-cells = <1>;
> > +			#size-cells = <0>;
> > +			reg = <0x481a0000 0x400>;
> > +			interrupt-parent = <&intc>;
> > +			interrupt = <125>;
> > +			ti,spi-num-cs = <2>;
> > +			ti,hwmods = "spi1";
> > +			status = "disabled";
> > +		};
> >  	};
> >  };
> > 
> 
> 

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