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| author | Rob Herring | 2014-05-28 18:23:39 +0200 |
|---|---|---|
| committer | Rob Herring | 2014-05-28 18:23:39 +0200 |
| commit | 728dd198aa543397c88f6f8e35f4f187b2bbc09d (patch) | |
| tree | d9f93149b69c3ece5849243a2836fbc511d3aae4 /Documentation | |
| parent | devicetree: bindings: Document micrel vendor prefix (diff) | |
| parent | tty/serial: pl011: add DT based earlycon support (diff) | |
| download | kernel-qcow2-linux-728dd198aa543397c88f6f8e35f4f187b2bbc09d.tar.gz kernel-qcow2-linux-728dd198aa543397c88f6f8e35f4f187b2bbc09d.tar.xz kernel-qcow2-linux-728dd198aa543397c88f6f8e35f4f187b2bbc09d.zip | |
Merge branch 'earlycon-dt' into for-next
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt | 33 | ||||
| -rw-r--r-- | Documentation/kernel-parameters.txt | 9 |
2 files changed, 42 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt new file mode 100644 index 000000000000..246c795668dc --- /dev/null +++ b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt @@ -0,0 +1,33 @@ +* NXP SC16IS7xx advanced Universal Asynchronous Receiver-Transmitter (UART) + +Required properties: +- compatible: Should be one of the following: + - "nxp,sc16is740" for NXP SC16IS740, + - "nxp,sc16is741" for NXP SC16IS741, + - "nxp,sc16is750" for NXP SC16IS750, + - "nxp,sc16is752" for NXP SC16IS752, + - "nxp,sc16is760" for NXP SC16IS760, + - "nxp,sc16is762" for NXP SC16IS762. +- reg: I2C address of the SC16IS7xx device. +- interrupt-parent: The phandle for the interrupt controller that + services interrupts for this IC. +- interrupts: Should contain the UART interrupt +- clocks: Reference to the IC source clock. + +Optional properties: +- gpio-controller: Marks the device node as a GPIO controller. +- #gpio-cells: Should be two. The first cell is the GPIO number and + the second cell is used to specify the GPIO polarity: + 0 = active high, + 1 = active low. + +Example: + sc16is750: sc16is750@51 { + compatible = "nxp,sc16is750"; + reg = <0x51>; + clocks = <&clk20m>; + interrupt-parent = <&gpio3>; + interrupts = <7 IRQ_TYPE_EDGE_FALLING>; + gpio-controller; + #gpio-cells = <2>; + }; diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 43842177b771..4946d8e58d53 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -883,6 +883,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. which are not unmapped. earlycon= [KNL] Output early console device and options. + uart[8250],io,<addr>[,options] uart[8250],mmio,<addr>[,options] uart[8250],mmio32,<addr>[,options] @@ -892,6 +893,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted. (mmio) or 32-bit (mmio32). The options are the same as for ttyS, above. + pl011,<addr> + Start an early, polled-mode console on a pl011 serial + port at the specified address. The pl011 serial port + must already be setup and configured. Options are not + yet supported. + + smh Use ARM semihosting calls for early console. + earlyprintk= [X86,SH,BLACKFIN,ARM] earlyprintk=vga earlyprintk=efi |