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

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Date:   Wed, 02 Aug 2023 21:50:39 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     Maxim Kiselev <bigunclemax@...il.com>
Cc:     linux-spi@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>,
        Mark Brown <broonie@...nel.org>,
        Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
        devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/3] riscv: dts: allwinner: d1: Add QSPI pins node for pinmux
 PC port

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@...il.com>:
> > 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@...il.com>
> > > ---
> > > 
> > >  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@...il.com>

Best regards,
Jernej