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Message-ID: <20130208165530.GG30595@game.jcrosoft.org>
Date: Fri, 8 Feb 2013 17:55:30 +0100
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To: "Yang, Wenyou" <Wenyou.Yang@...el.com>
Cc: "linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Ferre, Nicolas" <Nicolas.FERRE@...el.com>,
"richard.genoud@...il.com" <richard.genoud@...il.com>,
"Lin, JM" <JM.Lin@...el.com>,
"linux@....linux.org.uk" <linux@....linux.org.uk>
Subject: Re: [v4 PATCH 12/12] ARM: dts: add spi nodes for the atmel boards
On 01:51 Fri 08 Feb , Yang, Wenyou wrote:
> Hello, JC
>
> > -----Original Message-----
> > From: Yang, Wenyou
> > Sent: 2013年2月6日 9:35
> > To: 'Jean-Christophe PLAGNIOL-VILLARD'
> > Cc: linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; Ferre,
> > Nicolas; richard.genoud@...il.com; Lin, JM; linux@....linux.org.uk
> > Subject: RE: [v4 PATCH 12/12] ARM: dts: add spi nodes for the atmel boards
> >
> >
> >
> > > -----Original Message-----
> > > From: Jean-Christophe PLAGNIOL-VILLARD [mailto:plagnioj@...osoft.com]
> > > Sent: 2013年2月6日 3:50
> > > To: Yang, Wenyou
> > > Cc: linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org;
> > Ferre,
> > > Nicolas; richard.genoud@...il.com; Lin, JM; linux@....linux.org.uk
> > > Subject: Re: [v4 PATCH 12/12] ARM: dts: add spi nodes for the atmel boards
> > >
> > > On 15:34 Mon 14 Jan , Wenyou Yang wrote:
> > > > From: Richard Genoud <richard.genoud@...il.com>
> > > >
> > > > Signed-off-by: Richard Genoud <richard.genoud@...il.com>
> > > > [wenyou.yang@...el.com: added spi nodes for the sam9263ek,
> > sam9g20ek,
> > > sam9m10g45ek and sam9n12ek boards]
> > > > Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
> > > > Cc: linux@....linux.org.uk
> > > > ---
> > > > arch/arm/boot/dts/at91sam9263ek.dts | 14
> > > ++++++++++++++
> > > > arch/arm/boot/dts/at91sam9g20ek_common.dtsi | 14
> > > ++++++++++++++
> > > > arch/arm/boot/dts/at91sam9m10g45ek.dts | 14
> > > ++++++++++++++
> > > > arch/arm/boot/dts/at91sam9n12ek.dts | 14
> > > ++++++++++++++
> > > > arch/arm/boot/dts/at91sam9x5ek.dtsi | 14
> > ++++++++++++++
> > > > 5 files changed, 70 insertions(+)
> > > >
> > > > diff --git a/arch/arm/boot/dts/at91sam9263ek.dts
> > > b/arch/arm/boot/dts/at91sam9263ek.dts
> > > > index 1eb0872..63ba57b 100644
> > > > --- a/arch/arm/boot/dts/at91sam9263ek.dts
> > > > +++ b/arch/arm/boot/dts/at91sam9263ek.dts
> > > > @@ -79,6 +79,20 @@
> > > > };
> > > > };
> > > > };
> > > > +
> > > > + spi0: spi@...a4000 {
> > > > + status = "okay";
> > > > + cs-gpios = <&pioA 5 0
> > > > + &pioA 3 0
> > > > + &pioA 4 0
> > > > + &pioB 11 0
> > > NACK
> > >
> > > we no use that much as cs-gpios on this hw
> >
> > Thanks for your feedback.
> >
> > Listing the all choices for cs-gpios, one cs-gpio is selected by reg value.
> > Maybe listing one cs-gpio is OK.
> > I will try it.
> >
> > I am going to dig the feasibility of removing cs-gpios.
>
> I need remain the list of cs-gpios, because "master->num_chipselect" is got from the number of item of this list.
> If this list is removed, only the cs-gpio for used chip-select is provided , it works for CS0 chip-select, but it fails to work for other than CS0, e.g. CS1.
>
I did the cs-gpios support you can not expect to do not have it on at91
but you need to ONLY provide the used gpio not ALL
Best Regards,
J.
> Could you give me some idea?
> Thank you in advance.
>
> >
> > > > + >;
> > > > + mtd_dataflash@0 {
> > > > + compatible = "atmel,at45", "atmel,dataflash";
> > > > + spi-max-frequency = <50000000>;
> > > > + reg = <0>;
> > > > + };
> > > > + };
> > > > };
> > > >
> > > > nand0: nand@...00000 {
> > > > diff --git a/arch/arm/boot/dts/at91sam9g20ek_common.dtsi
> > > b/arch/arm/boot/dts/at91sam9g20ek_common.dtsi
> > > > index da15e83..49ad49e 100644
> > > > --- a/arch/arm/boot/dts/at91sam9g20ek_common.dtsi
> > > > +++ b/arch/arm/boot/dts/at91sam9g20ek_common.dtsi
> > > > @@ -96,6 +96,20 @@
> > > > status = "okay";
> > > > pinctrl-0 = <&pinctrl_ssc0_tx>;
> > > > };
> > > > +
> > > > + spi0: spi@...c8000 {
> > > > + status = "okay";
> > > > + cs-gpios = <&pioA 3 0
> > > > + &pioC 11 0
> > > > + &pioC 16 0
> > > > + &pioC 17 0
> > > ditto and so on
> > >
> > > you must only provife the gpio use by the hw
> > > > + >;
> > > > + mtd_dataflash@0 {
> > > > + compatible = "atmel,at45", "atmel,dataflash";
> > > > + spi-max-frequency = <50000000>;
> > > > + reg = <1>;
> > > > + };
> > > > + };
> > > > };
> > > >
> > > > nand0: nand@...00000 {
> > > > diff --git a/arch/arm/boot/dts/at91sam9m10g45ek.dts
> > > b/arch/arm/boot/dts/at91sam9m10g45ek.dts
> > > > index 20c3191..275f22d 100644
> > > > --- a/arch/arm/boot/dts/at91sam9m10g45ek.dts
> > > > +++ b/arch/arm/boot/dts/at91sam9m10g45ek.dts
> > > > @@ -102,6 +102,20 @@
> > > > };
> > > > };
> > > > };
> > > > +
> > > > + spi0: spi@...a4000{
> > > > + status = "okay";
> > > > + cs-gpios = <&pioB 3 0
> > > > + &pioB 18 0
> > > > + &pioB 19 0
> > > > + &pioD 27 0
> > > > + >;
> > > > + mtd_dataflash@0 {
> > > > + compatible = "atmel,at45", "atmel,dataflash";
> > > > + spi-max-frequency = <13000000>;
> > > > + reg = <0>;
> > > > + };
> > > > + };
> > > > };
> > > >
> > > > nand0: nand@...00000 {
> > > > diff --git a/arch/arm/boot/dts/at91sam9n12ek.dts
> > > b/arch/arm/boot/dts/at91sam9n12ek.dts
> > > > index 0376bf4..4eeca7b 100644
> > > > --- a/arch/arm/boot/dts/at91sam9n12ek.dts
> > > > +++ b/arch/arm/boot/dts/at91sam9n12ek.dts
> > > > @@ -67,6 +67,20 @@
> > > > };
> > > > };
> > > > };
> > > > +
> > > > + spi0: spi@...00000 {
> > > > + status = "okay";
> > > > + cs-gpios = <&pioA 14 0
> > > > + &pioA 7 0
> > > > + &pioA 1 0
> > > > + &pioB 3 0
> > > > + >;
> > > > + m25p80@0 {
> > > > + compatible = "atmel,at25df321a";
> > > > + spi-max-frequency = <50000000>;
> > > > + reg = <0>;
> > > > + };
> > > > + };
> > > > };
> > > >
> > > > nand0: nand@...00000 {
> > > > diff --git a/arch/arm/boot/dts/at91sam9x5ek.dtsi
> > > b/arch/arm/boot/dts/at91sam9x5ek.dtsi
> > > > index 8a7cf1d..ca0a056 100644
> > > > --- a/arch/arm/boot/dts/at91sam9x5ek.dtsi
> > > > +++ b/arch/arm/boot/dts/at91sam9x5ek.dtsi
> > > > @@ -84,6 +84,20 @@
> > > > };
> > > > };
> > > > };
> > > > +
> > > > + spi0: spi@...00000 {
> > > > + status = "okay";
> > > > + cs-gpios = <&pioA 14 0
> > > > + &pioA 7 0
> > > > + &pioA 1 0
> > > > + &pioB 3 0
> > > > + >;
> > > > + m25p80@0 {
> > > > + compatible = "atmel,at25df321a";
> > > > + spi-max-frequency = <50000000>;
> > > > + reg = <0>;
> > > > + };
> > > > + };
> > > > };
> > > >
> > > > usb0: ohci@...00000 {
> > > > --
> > > > 1.7.9.5
> > > >
> >
> > Best Regards,
> > Wenyou Yang
>
> Best Regards,
> Wenyou Yang
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