From adf3457b4ce6940885be3e5ee832c6949fba4166 Mon Sep 17 00:00:00 2001
From: John Garry <john.garry@huawei.com>
Date: Tue, 8 May 2018 18:27:32 +0800
Subject: [PATCH] HISI LPC: Add ACPI UART support

On the Huawei D03 development board the system UART is
the UART connected on the LPC bus.

The profile for the device driver required for this HW
is as follows:
 - platform driver
 - 16550
 - ACPI support
 - polling mode support
 - IO space support

In principle we should use the PNP driver (8250_dw.c) for
8250-devices with ACPI FW. However since this driver does
not support PNP devices, and modifying the PNP core code
to support it is not worth the effort, use the generic
8250 isa driver.

For this, we setup the pdev platform data for the serial
8250 port.

Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>
---
 drivers/bus/hisi_lpc.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/bus/hisi_lpc.c b/drivers/bus/hisi_lpc.c
index eb5b3fc186e0..d5f85455fa62 100644
--- a/drivers/bus/hisi_lpc.c
+++ b/drivers/bus/hisi_lpc.c
@@ -16,6 +16,7 @@
 #include <linux/of_address.h>
 #include <linux/of_platform.h>
 #include <linux/pci.h>
+#include <linux/serial_8250.h>
 #include <linux/slab.h>
 
 #define DRV_NAME "hisi-lpc"
@@ -493,6 +494,22 @@ static int hisi_lpc_acpi_probe(struct device *hostdev)
 				.hid = "IPI0001",
 				.name = "hisi-lpc-ipmi",
 			},
+			/* 8250-compatible uart */
+			{
+				.hid = "HISI1031",
+				.name = "serial8250",
+				.pdata = (struct plat_serial8250_port []) {
+					{
+						.iobase = res->start,
+						.uartclk = 1843200,
+						.iotype = UPIO_PORT,
+						.flags = UPF_BOOT_AUTOCONF,
+					},
+					{}
+				},
+				.pdata_size = 2 *
+					sizeof(struct plat_serial8250_port),
+			},
 			{}
 		};