From mboxrd@z Thu Jan 1 00:00:00 1970 From: bhupesh.sharma@freescale.com (Bhupesh Sharma) Date: Thu, 28 Aug 2014 15:25:01 +0530 Subject: [PATCH V2 1/6] Documentation: DT: Add bindings for FSL NS16550A UART In-Reply-To: <1409219706-14843-1-git-send-email-bhupesh.sharma@freescale.com> References: <1409219706-14843-1-git-send-email-bhupesh.sharma@freescale.com> Message-ID: <1409219706-14843-2-git-send-email-bhupesh.sharma@freescale.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This patch addss the device-tree documentation for Freescale's NS16550 UART (also called DUART). There is a specific errata fix required in FSL NS16550 UART which ensures that an random interrupt storm is not observed when a break is provided as an input to the UART. Signed-off-by: Bhupesh Sharma --- .../devicetree/bindings/serial/of-serial.txt | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/Documentation/devicetree/bindings/serial/of-serial.txt b/Documentation/devicetree/bindings/serial/of-serial.txt index 7705477..1bdc569 100644 --- a/Documentation/devicetree/bindings/serial/of-serial.txt +++ b/Documentation/devicetree/bindings/serial/of-serial.txt @@ -14,6 +14,7 @@ Required properties: - "altr,16550-FIFO32" - "altr,16550-FIFO64" - "altr,16550-FIFO128" + - "fsl,ns16550" - "serial" if the port type is unknown. - reg : offset and length of the register set for the device. - interrupts : should contain uart interrupt. @@ -39,6 +40,17 @@ Optional properties: property. - has-hw-flow-control: the hardware has flow control capability. +Note: +* fsl,ns16550: + ------------ + Freescale DUART is very similar to the PC16552D (and to a + pair of NS16550A), albeit with some nonstandard behavior such as + erratum A-004737 (relating to incorrect BRK handling). + + Represents a single port that is compatible with the DUART found + on many Freescale chips (examples include mpc8349, mpc8548, + mpc8641d, p4080 and ls2085a). + Example: uart at 80230000 { -- 1.7.9.5