linux-kernel - [PATCH v2 1/2] serial: 8250: Add dts binding to rate limit serial port during overruns

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Message-Id: <20181205005058.14095-1-darwin.dingel@alliedtelesis.co.nz>
Date:   Wed,  5 Dec 2018 13:50:57 +1300
From:   Darwin Dingel <darwin.dingel@...iedtelesis.co.nz>
To:     andriy.shevchenko@...ux.intel.com, gregkh@...uxfoundation.org,
        jslaby@...e.com, linux-serial@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Darwin Dingel <darwin.dingel@...iedtelesis.co.nz>
Subject: [PATCH v2 1/2] serial: 8250: Add dts binding to rate limit serial port during overruns

When this dts binding is enabled and input overrun on the serial port is
detected, serial port receive will be throttled to give some breathing room
for processing other tasks. This is particularly useful to avoid situations
where serial port HW malfunctions triggering input overruns and then other
processes get starved of processing time. Value provided will be in
milliseconds.

&serial0{
	overrun-throttle-ms = <500>;
};

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reviewed-by: Jiri Slaby <jslaby@...e.com>
Signed-off-by: Darwin Dingel <darwin.dingel@...iedtelesis.co.nz>
---
 Documentation/devicetree/bindings/serial/8250.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/serial/8250.txt b/Documentation/devicetree/bindings/serial/8250.txt
index aeb6db4e35c3..da50321da34d 100644
--- a/Documentation/devicetree/bindings/serial/8250.txt
+++ b/Documentation/devicetree/bindings/serial/8250.txt
@@ -51,6 +51,7 @@ Optional properties:
 - tx-threshold: Specify the TX FIFO low water indication for parts with
   programmable TX FIFO thresholds.
 - resets : phandle + reset specifier pairs
+- overrun-throttle-ms : how long to pause uart rx when input overrun is encountered.
 
 Note:
 * fsl,ns16550:
-- 
2.19.2

changes in v2:
- separated dts binding to another patch