On Tue, Sep 11, 2012 at 16:59:05, Porter, Matt wrote:
> On Tue, Sep 11, 2012 at 04:57:08AM +0000, Hiremath, Vaibhav wrote:
> > On Mon, Sep 10, 2012 at 21:50:20, Porter, Matt wrote:
> > > On AM33xx, the datasheet and TRM refer to four GPIO instances that
> > > are 0-based, GPIO0-3.
> > >
> >
> > Thanks Matt,
> > I think Anil labeled it as gpio1-4 due to hwmod naming convention, as you
> > can not have gpioo id = 0 (refer to arch/arm/mach-omap2/gpio.c).
>
> Right, and that convention originally came from the assumption that
> everything would be 1-based like OMAP3/4.
>
> > But in case of DT we should simply follow TRM/Spec, as naming convention is
> > based on base-addr and not id, so your patch looks good me.
>
> Yes, my biggest concern here was the coming frustration that the end
> "user" or system integrator would have with these labels not matching
> the docs that have been around for a year. It would be !sane to have
> somebody look at a schematic and then write their dts with a value that
> doesn't match the h/w. That would run counter to the fundamental
> requirement that DT is a description of the hardware. The user led patch
> was already the first example of that where the comments mentioned gpio1
> in the pinmux data but the data referenced the gpio2 label.
>
I understand and your patch is already fixing the "biggest concern" here,
right.
Thanks,
Vaibhav
> -Matt
>
> > > Signed-off-by: Matt Porter <mporter@xxxxxx>
> > > ---
> > > arch/arm/boot/dts/am33xx.dtsi | 8 ++++----
> > > 1 file changed, 4 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/arch/arm/boot/dts/am33xx.dtsi b/arch/arm/boot/dts/am33xx.dtsi
> > > index bb31bff..1369bfc 100644
> > > --- a/arch/arm/boot/dts/am33xx.dtsi
> > > +++ b/arch/arm/boot/dts/am33xx.dtsi
> > > @@ -62,7 +62,7 @@
> > > reg = <0x48200000 0x1000>;
> > > };
> > >
> > > - gpio1: gpio@44e07000 {
> > > + gpio0: gpio@44e07000 {
> > > compatible = "ti,omap4-gpio";
> > > ti,hwmods = "gpio1";
> > > gpio-controller;
> > > @@ -74,7 +74,7 @@
> > > interrupts = <96>;
> > > };
> > >
> > > - gpio2: gpio@4804c000 {
> > > + gpio1: gpio@4804c000 {
> > > compatible = "ti,omap4-gpio";
> > > ti,hwmods = "gpio2";
> > > gpio-controller;
> > > @@ -86,7 +86,7 @@
> > > interrupts = <98>;
> > > };
> > >
> > > - gpio3: gpio@481ac000 {
> > > + gpio2: gpio@481ac000 {
> > > compatible = "ti,omap4-gpio";
> > > ti,hwmods = "gpio3";
> > > gpio-controller;
> > > @@ -98,7 +98,7 @@
> > > interrupts = <32>;
> > > };
> > >
> > > - gpio4: gpio@481ae000 {
> > > + gpio3: gpio@481ae000 {
> > > compatible = "ti,omap4-gpio";
> > > ti,hwmods = "gpio4";
> > > gpio-controller;
> > > --
> > > 1.7.9.5
> > >
> > >
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> > the body of a message to majordomo@xxxxxxxxxxxxxxx
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at http://www.tux.org/lkml/
>
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
