linux-kernel - [PATCH 2/2] serial: 8250_dw: add ACPI support for uart on Hisilicon Hip05 soc

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Message-ID: <1467083835-37750-3-git-send-email-wangkefeng.wang@huawei.com>
Date:	Tue, 28 Jun 2016 11:17:15 +0800
From:	Kefeng Wang <wangkefeng.wang@...wei.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Jiri Slaby <jslaby@...e.com>, <linux-serial@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	<z.liuxinliang@...ilicon.com>, <guohanjun@...wei.com>,
	Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH 2/2] serial: 8250_dw: add ACPI support for uart on Hisilicon Hip05 soc

Add ACPI identifier for UART on Hisilicon Hip05 soc, be careful
that it is not 16550 compatibal.

Meanwhile, set dw8250_serial_out32 to keep consistent between serial_out
and serial_in in ACPI.

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 drivers/tty/serial/8250/8250_dw.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 65f3da7..7571b0f 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -301,8 +301,11 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data)
 		p->iotype = UPIO_MEM32;
 		p->regshift = 2;
 		p->serial_in = dw8250_serial_in32;
-		/* So far none of there implement the Busy Functionality */
-		data->uart_16550_compatible = true;
+		p->serial_out = dw8250_serial_out32;
+
+		/* Hisilicon 8250 dw uart is not 16550 compatible */
+		if (!acpi_dev_found("HISI0031"))
+			data->uart_16550_compatible = true;
 	}
 
 	/* Platforms with iDMA */
@@ -618,6 +621,7 @@ static const struct acpi_device_id dw8250_acpi_match[] = {
 	{ "APMC0D08", 0},
 	{ "AMD0020", 0 },
 	{ "AMDI0020", 0 },
+	{ "HISI0031", 0 },
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match);
-- 
1.7.12.4