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References: <20240110102102.61587-1-tudor.ambarus@linaro.org> <20240110102102.61587-4-tudor.ambarus@linaro.org>
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From: Sam Protsenko <semen.protsenko@linaro.org>
Date: Tue, 16 Jan 2024 12:14:28 -0600
Message-ID: <CAPLW+4mY4VUm+cryBDFLp9TFkxG2oqJrmbZVuRuT5bFOzYXrnQ@mail.gmail.com>
Subject: Re: [PATCH 03/18] tty: serial: samsung: add gs101 earlycon support
To: Tudor Ambarus <tudor.ambarus@linaro.org>
Cc: krzysztof.kozlowski@linaro.org, alim.akhtar@samsung.com, 
	gregkh@linuxfoundation.org, jirislaby@kernel.org, 
	linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, 
	linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, 
	andre.draszik@linaro.org, peter.griffin@linaro.org, kernel-team@android.com, 
	willmcvicker@google.com
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On Wed, Jan 10, 2024 at 4:21=E2=80=AFAM 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.
>
> Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
> ---

Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>

>  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/samsun=
g_tty.c
> index 20ec6ef1a52f..74bc5151dad4 100644
> --- a/drivers/tty/serial/samsung_tty.c
> +++ b/drivers/tty/serial/samsung_tty.c
> @@ -2810,6 +2810,17 @@ OF_EARLYCON_DECLARE(exynos4210, "samsung,exynos421=
0-uart",
>  OF_EARLYCON_DECLARE(artpec8, "axis,artpec8-uart",
>                         s5pv210_early_console_setup);
>
> +static int __init gs101_early_console_setup(struct earlycon_device *devi=
ce,
> +                                           const char *opt)
> +{
> +       /* gs101 always expects MMIO32 register accesses. */
> +       device->port.iotype =3D UPIO_MEM32;
> +
> +       return s5pv210_early_console_setup(device, opt);
> +}
> +
> +OF_EARLYCON_DECLARE(gs101, "google,gs101-uart", gs101_early_console_setu=
p);
> +
>  /* Apple S5L */
>  static int __init apple_s5l_early_console_setup(struct earlycon_device *=
device,
>                                                 const char *opt)
> --
> 2.43.0.472.g3155946c3a-goog
>
>