[PATCH v2] arm64: dts: renesas: sparrow-hawk: Add overlay for WaveShare 2CH CANFD HAT

[Geert Uytterhoeven]

Hi Marek,

On Wed, 9 Sept 2026 at 17:14, Marek Vasut
<marek.vasut+renesas at mailbox.org> wrote:
> Add a DT overlay to bind the WaveShare 2-Channel Isolated CAN FD
> Expansion HAT on the Retronix R-Car V4H Sparrow Hawk board.
>
> Current device link is at https://www.waveshare.com/2-ch-can-fd-hat.htm
>
> Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>

> V2: - Drop the unique spi controller node identifier
>     - Switch IRQ to active low
>     - Sort compatible and reg properties
>     - Add "CN7 pin 22" comment
>     - Move pwm1 node to the top and add comment
>     - Rename MSIOF0 PFC node

Thanks for the update!

> --- /dev/null
> +++ b/arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-ws-2ch-canfd.dtso

> +&{/} {
> +       /* Fixed clock dedicated to SPI CAN on 2-CH CAN FD HAT */
> +       clk_can0: clk-ws-2ch-canfd0 {
> +               compatible = "fixed-clock";
> +               #clock-cells = <0>;
> +               clock-frequency = <40000000>;
> +       };
> +
> +       clk_can1: clk-ws-2ch-canfd1 {
> +               compatible = "fixed-clock";
> +               #clock-cells = <0>;
> +               clock-frequency = <40000000>;
> +       };
> +
> +       /*
> +        * SPI_1 is operated as GPIO SPI, because MSIOF5 can not be
> +        * muxed on the pins allocated for SPI_1 on this CANFD HAT.
> +        */
> +       spi {   /* SPI_1 */

As this lives at the root node, I'd rather change it back to
spi-ws-2ch-canfd while applying, if you don't mind?

Reviewed-by: Geert Uytterhoeven <geert+renesas at glider.be>
i.e. will queue in renesas-devel for v7.4, with the above fixed.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds