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SubjectRe: [PATCH 2/2] ARM: dts: berlin: add GPIO nodes for the BG2Q
Hi Sebastian,

On Tue, 15 Apr 2014 02:23:03 -0700
Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> wrote:

> On 04/15/2014 10:07 AM, Antoine Ténart wrote:
> > The Marvell Berlin BG2Q has 6 GPIO ports compatible with the
> > snps,dw-apb-gpio driver. This patch add the corresponding device tree
> > nodes.
> >
> > Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
> > ---
> > arch/arm/boot/dts/berlin2q.dtsi | 102
> > ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/berlin2q.dtsi
> > b/arch/arm/boot/dts/berlin2q.dtsi index e6e556055dfc..b2625f896bc5 100644
> > --- a/arch/arm/boot/dts/berlin2q.dtsi
> > +++ b/arch/arm/boot/dts/berlin2q.dtsi
> > @@ -109,6 +109,78 @@
> > ranges = <0 0xe80000 0x10000>;
> > interrupt-parent = <&aic>;
> >
> > + gpio0: gpio@0400 {
> > + compatible = "snps,dw-apb-gpio";
> > + reg = <0x0400 0x400>;
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + porta: gpio-controller@0 {
>
> ePAPR recommended name is even more generic, i.e. "gpio". If
> that clashed in any way with other numbered names, I suggest
> to rename to "gpio-port" as actually the controller is the
> parent node and this represents one port (in the nomenclature
> of DW-APB-GPIO).
>
> > + compatible =
> > "snps,dw-apb-gpio-port";
> > + gpio-controller;
> > + #gpio-cells = <2>;
> > + snps,nr-gpios = <32>;
>
> 32 gpio pins for each of the 6 GPIO controllers? Either BG2Q is a GPIO

Yes, BG2Q support 32 pins every port

> beast or it is a mistake :P
>
> Can you please double-check?
>
> I am fine with using nr-gpios property now, but I guess BG2Q also
> has that CONFIG[1,2] registers to actually read out the features
> synthesized in? If I find some time, I'll prepare a patch for
> dw-apb-gpio to exploit that (optional) information instead of
> using nr-gpios.

The problem is CONFIG1/2 registers don't exist on some versions.
For example, the version used in BG2/BG2CD. So nr-gpio is necessary
if we want to support these versions.

Thanks,
Jisheng
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