linux-kernel - Re: [PATCH] arm64: dts: allwinner: a64-oceanic-5205-5inmfd: Enable CAN

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Date:   Tue, 21 May 2019 08:47:02 +0200
From:   Michael Nazzareno Trimarchi <michael@...rulasolutions.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Jagan Teki <jagan@...rulasolutions.com>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-amarula <linux-amarula@...rulasolutions.com>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH] arm64: dts: allwinner: a64-oceanic-5205-5inmfd: Enable CAN

Hi Maxime

On Thu, Apr 18, 2019 at 4:56 PM Maxime Ripard <maxime.ripard@...tlin.com> wrote:
>
> On Thu, Apr 18, 2019 at 07:46:58PM +0530, Jagan Teki wrote:
> > Oceanic 5205 5inMFD has MCP2515 CAN device connected via SPI1.
> >
> > - via SPI1 bus
> > - vdd supplied by 5V supply along with PL2 enable pin
> > - xceiver supply same as vdd
> > - can oscillator connected at 20MHz
> > - PB2 gpio as interrupt pin
> > - PD6 gpio as RX_BUF1_CAN0
> > - PD7 gpio as RX_BUF0_CAN0
> >
> > Tested-by: Tamas Papp <tamas@...kl.com>
> > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> > ---
> >  .../sun50i-a64-oceanic-5205-5inmfd.dts        | 43 +++++++++++++++++++
> >  1 file changed, 43 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-oceanic-5205-5inmfd.dts b/arch/arm64/boot/dts/allwinner/sun50i-a64-oceanic-5205-5inmfd.dts
> > index f0cd6587f619..22535a297f51 100644
> > --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-oceanic-5205-5inmfd.dts
> > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-oceanic-5205-5inmfd.dts
> > @@ -21,6 +21,24 @@
> >       chosen {
> >               stdout-path = "serial0:115200n8";
> >       };
> > +
> > +     can_osc: can-osc {
> > +             compatible = "fixed-clock";
> > +             #clock-cells = <0>;
> > +             clock-frequency = <20000000>;
> > +     };
> > +
> > +     reg_can_v5v: reg-can-v5v {
> > +             compatible = "regulator-fixed";
> > +             regulator-name = "reg-can-v5v";
> > +             regulator-min-microvolt = <5000000>;
> > +             regulator-max-microvolt = <5000000>;
> > +             regulator-boot-on;
> > +             enable-active-high;
> > +             gpio = <&r_pio 0 2 GPIO_ACTIVE_HIGH>; /* CAN_3V3_EN: PL2 */
> > +             status = "okay";
>
> You don't need the status property here.
>

Correct, need to be dropped

> > +     };
> > +
> >  };
> >
> >  &ehci0 {
> > @@ -77,6 +95,31 @@
> >       status = "okay";
> >  };
> >
> > +&pio {
> > +     can_pins: can-pins {
> > +             pins = "PD6",                   /* RX_BUF1_CAN0 */
> > +                    "PD7";                   /* RX_BUF0_CAN0 */
> > +             function = "gpio_in";
> > +     };
> > +};
>
> That isn't needed. What are they used for, you're not tying them to
> anything?

Mux of their function is correct. They are connected in the schematics
but not used right now.
I can garantee that kernel wlll always configurred in the right way
and if I want I can export in userspace
for debug purpose

Michael


>
> Maxime
>
> --
> Maxime Ripard, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com



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| Michael Nazzareno Trimarchi                     Amarula Solutions BV |
| COO  -  Founder                                      Cruquiuskade 47 |
| +31(0)851119172                                 Amsterdam 1018 AM NL |
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