From fffb86c826e95679abf0b5d8b90794c39218182e Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Wed, 5 Jun 2019 00:06:34 +0200 Subject: dts: update to v5.2-rc2 Signed-off-by: Sascha Hauer --- .../sifive/sifive-blocks-ip-versioning.txt | 38 ++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 dts/Bindings/sifive/sifive-blocks-ip-versioning.txt (limited to 'dts/Bindings/sifive/sifive-blocks-ip-versioning.txt') diff --git a/dts/Bindings/sifive/sifive-blocks-ip-versioning.txt b/dts/Bindings/sifive/sifive-blocks-ip-versioning.txt new file mode 100644 index 0000000000..beaa3b6408 --- /dev/null +++ b/dts/Bindings/sifive/sifive-blocks-ip-versioning.txt @@ -0,0 +1,38 @@ +DT compatible string versioning for SiFive open-source IP blocks + +This document describes the version specification for DT "compatible" +strings for open-source SiFive IP blocks. HDL for these IP blocks +can be found in this public repository: + +https://github.com/sifive/sifive-blocks + +IP block-specific DT compatible strings are contained within the HDL, +in the form "sifive,". + +An example is "sifive,uart0" from: + +https://github.com/sifive/sifive-blocks/blob/v1.0/src/main/scala/devices/uart/UART.scala#L43 + +Until these IP blocks (or IP integration) support version +auto-discovery, the maintainers of these IP blocks intend to increment +the suffixed number in the compatible string whenever the software +interface to these IP blocks changes, or when the functionality of the +underlying IP blocks changes in a way that software should be aware of. + +Driver developers can use compatible string "match" values such as +"sifive,uart0" to indicate that their driver is compatible with the +register interface and functionality associated with the relevant +upstream sifive-blocks commits. It is expected that most drivers will +match on these IP block-specific compatible strings. + +DT data authors, when writing data for a particular SoC, should +continue to specify an SoC-specific compatible string value, such as +"sifive,fu540-c000-uart". This way, if SoC-specific +integration-specific bug fixes or workarounds are needed, the kernel +or other system software can match on this string to apply them. The +IP block-specific compatible string (such as "sifive,uart0") should +then be specified as a subsequent value. + +An example of this style: + + compatible = "sifive,fu540-c000-uart", "sifive,uart0"; -- cgit v1.2.3