[PATCH v3 3/3] serial: 8250_dw: add ACPI support for uart on Hisilicon Hip05 soc

[Kefeng Wang <wangkefeng.wang@huawei.com>]

Use built-in device properties to set device parameters for the
existing device probed by acpi.

Add ACPI identifier for UART on Hisilicon Hip05 soc, be careful
that it is not 16550 compatibal, so we need set "reg-io-width"
and "reg-shift" by _DSD method in DSDT.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
 drivers/tty/serial/8250/8250_dw.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index d6934310..5ab9cfe 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -297,12 +297,6 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data)
 			p->serial_in = dw8250_serial_in32be;
 			p->serial_out = dw8250_serial_out32be;
 		}
-	} else if (has_acpi_companion(p->dev)) {
-		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;
 	}
 
 	/* Platforms with iDMA */
@@ -352,6 +346,19 @@ static void dw8250_setup_port(struct uart_port *p)
 		up->capabilities |= UART_CAP_AFE;
 }
 
+static struct property_entry dw8250_properties[] = {
+	PROPERTY_ENTRY_U32("reg-io-width", 4),
+	PROPERTY_ENTRY_U32("reg-shift", 2),
+	PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
+	{ },
+};
+
+/* non 16550 compatible id list*/
+static const struct acpi_device_id non_16550_ids[] = {
+	{ "HISI0031", 0 },
+	{ },
+};
+
 static int dw8250_probe(struct platform_device *pdev)
 {
 	struct uart_8250_port uart = {};
@@ -395,6 +402,9 @@ static int dw8250_probe(struct platform_device *pdev)
 	if (!data)
 		return -ENOMEM;
 
+	if (has_acpi_companion(dev) && !acpi_match_device(non_16550_ids, dev))
+		platform_device_add_properties(pdev, dw8250_properties);
+
 	data->dma.fn = dw8250_fallback_dma_filter;
 	data->usr_reg = DW_UART_USR;
 	p->private_data = data;
@@ -619,6 +629,7 @@ 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