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From: Rouven Czerwinski <r.czerwinski@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Subject: [PATCH v2 4/8] serial_ns16550: handle default reg-io-width
Date: Thu, 13 Dec 2018 08:44:26 +0100	[thread overview]
Message-ID: <20181213074430.25614-5-r.czerwinski@pengutronix.de> (raw)
In-Reply-To: <20181213074430.25614-1-r.czerwinski@pengutronix.de>

According to the device tree bindings for 8250, width is an optional property.
Default to 1 which is the same default value as used by the kernel.
Before this change the driver would not work for device trees which do not
include the optional binding.

Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
---
 drivers/serial/serial_ns16550.c | 46 ++++++++++++++++-----------------
 1 file changed, 23 insertions(+), 23 deletions(-)

diff --git a/drivers/serial/serial_ns16550.c b/drivers/serial/serial_ns16550.c
index 4d73ea8b8..8ddcfdbef 100644
--- a/drivers/serial/serial_ns16550.c
+++ b/drivers/serial/serial_ns16550.c
@@ -297,36 +297,36 @@ static int ns16550_tstc(struct console_device *cdev)
 static void ns16550_probe_dt(struct device_d *dev, struct ns16550_priv *priv)
 {
 	struct device_node *np = dev->device_node;
-	u32 width;
+	u32 width = 1;
 
 	if (!IS_ENABLED(CONFIG_OFDEVICE))
 		return;
 
 	of_property_read_u32(np, "clock-frequency", &priv->plat.clock);
 	of_property_read_u32(np, "reg-shift", &priv->plat.shift);
-	if (!of_property_read_u32(np, "reg-io-width", &width))
-		switch (width) {
-		case 1:
-			priv->read_reg = ns16550_read_reg_mmio_8;
-			priv->write_reg = ns16550_write_reg_mmio_8;
-			break;
-		case 2:
-			priv->read_reg = ns16550_read_reg_mmio_16;
-			priv->write_reg = ns16550_write_reg_mmio_16;
-			break;
-		case 4:
-			if (of_device_is_big_endian(np)) {
-				priv->read_reg = ns16550_read_reg_mmio_32be;
-				priv->write_reg = ns16550_write_reg_mmio_32be;
-			} else {
-				priv->read_reg = ns16550_read_reg_mmio_32;
-				priv->write_reg = ns16550_write_reg_mmio_32;
-			}
-			break;
-		default:
-			dev_err(dev, "unsupported reg-io-width (%d)\n",
-				width);
+	of_property_read_u32(np, "reg-io-width", &width);
+	switch (width) {
+	case 1:
+		priv->read_reg = ns16550_read_reg_mmio_8;
+		priv->write_reg = ns16550_write_reg_mmio_8;
+		break;
+	case 2:
+		priv->read_reg = ns16550_read_reg_mmio_16;
+		priv->write_reg = ns16550_write_reg_mmio_16;
+		break;
+	case 4:
+		if (of_device_is_big_endian(np)) {
+			priv->read_reg = ns16550_read_reg_mmio_32be;
+			priv->write_reg = ns16550_write_reg_mmio_32be;
+		} else {
+			priv->read_reg = ns16550_read_reg_mmio_32;
+			priv->write_reg = ns16550_write_reg_mmio_32;
 		}
+		break;
+	default:
+		dev_err(dev, "unsupported reg-io-width (%d)\n",
+			width);
+	}
 }
 
 static struct ns16550_drvdata ns16450_drvdata = {
-- 
2.19.1


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  parent reply	other threads:[~2018-12-13  7:44 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-13  7:44 [PATCH v2 0/8] Raspberry Pi miniuart support Rouven Czerwinski
2018-12-13  7:44 ` [PATCH v2 1/8] ARM: rpi: fix typo in rpi-common.c Rouven Czerwinski
2018-12-13  7:44 ` [PATCH v2 2/8] ARM: rpi: move clks into board specific rpi-common Rouven Czerwinski
2018-12-13  7:44 ` [PATCH v2 3/8] ARM: rpi: retrieve miniuart clock from firmware Rouven Czerwinski
2018-12-13  7:44 ` Rouven Czerwinski [this message]
2018-12-13 15:56   ` [PATCH v2 4/8] serial_ns16550: handle default reg-io-width Oleksij Rempel
2018-12-14 10:58     ` Sascha Hauer
2018-12-13  7:44 ` [PATCH v2 5/8] serial_ns16550: add raspberry pi compatible and init Rouven Czerwinski
2018-12-13 15:53   ` Oleksij Rempel
2018-12-13  7:44 ` [PATCH v2 6/8] ARM: rpi: add NS16550 support Rouven Czerwinski
2018-12-13  7:44 ` [PATCH v2 7/8] ARM: rpi: choose miniuart as stdout Rouven Czerwinski
2018-12-13  7:44 ` [PATCH v2 8/8] doc: bcm283x: remove miniuart overlay instruction Rouven Czerwinski

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