linux-kernel - [PATCH 5/6] tty: serial: lpuart: add earlycon support for imx7ulp

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Date:   Tue, 9 May 2017 15:50:47 +0800
From:   Dong Aisheng <aisheng.dong@....com>
To:     <linux-serial@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <gregkh@...uxfoundation.org>, <jslaby@...e.com>,
        <fugang.duan@....com>, <stefan@...er.ch>, <Mingkai.Hu@....com>,
        <yangbo.lu@....com>, Dong Aisheng <aisheng.dong@....com>
Subject: [PATCH 5/6] tty: serial: lpuart: add earlycon support for imx7ulp

earlycon is executed quite early before the device tree probe,
so we need configure the correct reg_off for imx7ulp during
early console setup.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jslaby@...e.com>
Cc: Fugang Duan <fugang.duan@....com>
Cc: Stefan Agner <stefan@...er.ch>
Cc: Mingkai Hu <Mingkai.Hu@....com>
Cc: Yangbo Lu <yangbo.lu@....com>
Signed-off-by: Dong Aisheng <aisheng.dong@....com>
---
 drivers/tty/serial/fsl_lpuart.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 1cdb3f9..5b485e8 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1978,8 +1978,20 @@ static int __init lpuart32_early_console_setup(struct earlycon_device *device,
 	return 0;
 }
 
+static int __init lpuart32_imx_early_console_setup(struct earlycon_device *device,
+						   const char *opt)
+{
+	if (!device->port.membase)
+		return -ENODEV;
+
+	lpuart_reg_off = IMX_REG_OFF;
+	device->con->write = lpuart32_early_write;
+
+	return 0;
+}
 OF_EARLYCON_DECLARE(lpuart, "fsl,vf610-lpuart", lpuart_early_console_setup);
 OF_EARLYCON_DECLARE(lpuart32, "fsl,ls1021a-lpuart", lpuart32_early_console_setup);
+OF_EARLYCON_DECLARE(lpuart32, "fsl,imx7ulp-lpuart", lpuart32_imx_early_console_setup);
 EARLYCON_DECLARE(lpuart, lpuart_early_console_setup);
 EARLYCON_DECLARE(lpuart32, lpuart32_early_console_setup);
 
-- 
2.7.4