* [PATCH] serial: ns16550: support reg-offset device-tree property
@ 2019-06-28 15:56 Marcin Niestroj
2019-07-02 6:17 ` Sascha Hauer
0 siblings, 1 reply; 2+ messages in thread
From: Marcin Niestroj @ 2019-06-28 15:56 UTC (permalink / raw)
To: barebox; +Cc: Marcin Niestroj
Some SoC have serial registers shifted by fixed offset. Support them by
respecting 'reg-offset' device-tree property.
Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
---
drivers/serial/serial_ns16550.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/serial/serial_ns16550.c b/drivers/serial/serial_ns16550.c
index 4c84d27bd..3edeb0dcb 100644
--- a/drivers/serial/serial_ns16550.c
+++ b/drivers/serial/serial_ns16550.c
@@ -314,12 +314,15 @@ 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 offset;
u32 width = 1;
if (!IS_ENABLED(CONFIG_OFDEVICE))
return;
of_property_read_u32(np, "clock-frequency", &priv->plat.clock);
+ if (of_property_read_u32(np, "reg-offset", &offset) == 0)
+ priv->mmiobase += offset;
of_property_read_u32(np, "reg-shift", &priv->plat.shift);
of_property_read_u32(np, "reg-io-width", &width);
switch (width) {
--
2.21.0
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2019-06-28 15:56 [PATCH] serial: ns16550: support reg-offset device-tree property Marcin Niestroj
2019-07-02 6:17 ` Sascha Hauer
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