linux-kernel - [PATCH v3 06/12] tty: serial: samsung: add gs101 earlycon support

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Date: Tue,  9 Jan 2024 12:58:08 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: peter.griffin@...aro.org,
	krzysztof.kozlowski+dt@...aro.org,
	gregkh@...uxfoundation.org
Cc: mturquette@...libre.com,
	sboyd@...nel.org,
	robh+dt@...nel.org,
	conor+dt@...nel.org,
	andi.shyti@...nel.org,
	alim.akhtar@...sung.com,
	jirislaby@...nel.org,
	s.nawrocki@...sung.com,
	tomasz.figa@...il.com,
	cw00.choi@...sung.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-i2c@...r.kernel.org,
	linux-serial@...r.kernel.org,
	andre.draszik@...aro.org,
	kernel-team@...roid.com,
	willmcvicker@...gle.com,
	Tudor Ambarus <tudor.ambarus@...aro.org>
Subject: [PATCH v3 06/12] tty: serial: samsung: add gs101 earlycon support

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@...aro.org>
Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
---
v3: collect Peter's R-b tag
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 a81b61953a28..fed50423b7c1 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