Re: [PATCH v1 3/3] riscv: dts: allwinner: d1: Add QSPI pins node for pinmux PC port

[Jernej Škrabec]

Dne ponedeljek, 31. julij 2023 ob 17:22:11 CEST je Maxim Kiselev napisal(a):
> пн, 31 июл. 2023 г. в 01:30, Jernej Škrabec <jernej.skrabec@xxxxxxxxx>:
> > Dne sobota, 24. junij 2023 ob 15:16:24 CEST je Maksim Kiselev napisal(a):
> > > Add pinmux node that describes pins on PC port which required for
> > > QSPI mode.
> > > 
> > > Signed-off-by: Maksim Kiselev <bigunclemax@xxxxxxxxx>
> > > ---
> > > 
> > >  arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi | 7 +++++++
> > >  1 file changed, 7 insertions(+)
> > > 
> > > diff --git a/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi
> > > b/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi index
> > > 1bb1e5cae602..9f754dd03d85 100644
> > > --- a/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi
> > > +++ b/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi
> > > @@ -131,6 +131,13 @@ uart3_pb_pins: uart3-pb-pins {
> > > 
> > >                               pins = "PB6", "PB7";
> > >                               function = "uart3";
> > >                       
> > >                       };
> > > 
> > > +
> > > +                     /omit-if-no-ref/
> > > +                     qspi0_pc_pins: qspi0-pc-pins {
> > > +                             pins = "PC2", "PC3", "PC4", "PC5",
> > 
> > "PC6",
> > 
> > > +                                    "PC7";
> > > +                             function = "spi0";
> > > +                     };
> > 
> > Sorry for late review, but it seems I'm missing something. D1 manual says
> > those are pins for ordinary SPI, with HOLD and WP signals. Can they be
> > repurposed for quad SPI?
> 
> Yes, they can. Here is a quote from D1 datasheet (9.3.3.8 SPI
> Quad-Input/Quad-Output Mode):
> "Using the quad mode allows data to be transferred to or from the
> device at 4 times the rate of standard single mode, the data can be
> read
> at fast speed using four data bits (MOSI, MISO, IO2 (WP#) and IO3
> (HOLD#)) at the same time."

Alright then.

Acked-by: Jernej Skrabec <jernej.skrabec@xxxxxxxxx>

Best regards,
Jernej