[PATCH] serial: ns16550: support reg-offset device-tree property

[PATCH] serial: ns16550: support reg-offset device-tree property

[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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Re: [PATCH] serial: ns16550: support reg-offset device-tree property

[Sascha Hauer]

On Fri, Jun 28, 2019 at 05:56:43PM +0200, Marcin Niestroj wrote:
> 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(+)

Applied, thanks

Sascha


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