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tty: serial: samsung: add gs101 earlycon support

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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>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Link: https://lore.kernel.org/r/20240119104526.1221243-6-tudor.ambarus@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tudor Ambarus
2024-01-19 10:45:12 +00:00
committed by Greg Kroah-Hartman
parent 0b87a9fd67
commit 5887cab232
1 changed files with 11 additions and 0 deletions
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11
drivers/tty/serial/samsung_tty.c
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@@ -2809,6 +2809,17 @@ 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)