Hi Tudor,
On Thu, 28 Dec 2023 at 12:58, Tudor Ambarus <tudor.ambarus@linaro.org> wrote:
>
> The entire bus (PERIC) on which the GS101 serial resides only allows
> 32-bit register accesses. The reg-io-width dt property is disallowed
> for the "google,gs101-uart" compatible and instead the iotype is
> inferred from the compatible. Always set UPIO_MEM32 iotype for the
> gs101 earlycon.
>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
That's a nice addition to avoid folks shooting themselves in the foot
when enabling earlycon.
Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
> ---
> v2: update commit message
>
> drivers/tty/serial/samsung_tty.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
> index 938127179acf..2fbaaf0e756b 100644
> --- a/drivers/tty/serial/samsung_tty.c
> +++ b/drivers/tty/serial/samsung_tty.c
> @@ -2812,6 +2812,17 @@ OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos4210-uart",
> OF_EARLYCON_DECLARE(artpec8, "axis,artpec8-uart",
> s5pv210_early_console_setup);
>
> +static int __init gs101_early_console_setup(struct earlycon_device *device,
> + const char *opt)
> +{
> + /* gs101 always expects MMIO32 register accesses. */
> + device->port.iotype = UPIO_MEM32;
> +
> + return s5pv210_early_console_setup(device, opt);
> +}
> +
> +OF_EARLYCON_DECLARE(gs101, "google,gs101-uart", gs101_early_console_setup);
> +
> /* Apple S5L */
> static int __init apple_s5l_early_console_setup(struct earlycon_device *device,
> const char *opt)
> --
> 2.43.0.472.g3155946c3a-goog
>