This commit adds a dt-bindings document of PECI adapter driver for Aspeed AST24xx/25xx SoCs.
Signed-off-by: Jae Hyun Yoo <jae.hyun....@linux.intel.com> Reviewed-by: Haiyue Wang <haiyue.w...@linux.intel.com> Reviewed-by: James Feist <james.fe...@linux.intel.com> Reviewed-by: Vernon Mauery <vernon.mau...@linux.intel.com> Cc: Alan Cox <a...@linux.intel.com> Cc: Andrew Jeffery <and...@aj.id.au> Cc: Andrew Lunn <and...@lunn.ch> Cc: Andy Shevchenko <andriy.shevche...@intel.com> Cc: Arnd Bergmann <a...@arndb.de> Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org> Cc: Fengguang Wu <fengguang...@intel.com> Cc: Greg KH <gre...@linuxfoundation.org> Cc: Guenter Roeck <li...@roeck-us.net> Cc: Jason M Biils <jason.m.bi...@linux.intel.com> Cc: Jean Delvare <jdelv...@suse.com> Cc: Joel Stanley <j...@jms.id.au> Cc: Julia Cartwright <jul...@eso.teric.us> Cc: Miguel Ojeda <miguel.ojeda.sando...@gmail.com> Cc: Milton Miller II <milt...@us.ibm.com> Cc: Pavel Machek <pa...@ucw.cz> Cc: Randy Dunlap <rdun...@infradead.org> Cc: Stef van Os <stef.van...@prodrive-technologies.com> Cc: Sumeet R Pawnikar <sumeet.r.pawni...@intel.com> --- .../devicetree/bindings/peci/peci-aspeed.txt | 60 ++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.txt diff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.txt b/Documentation/devicetree/bindings/peci/peci-aspeed.txt new file mode 100644 index 000000000000..4598bb8c20fa --- /dev/null +++ b/Documentation/devicetree/bindings/peci/peci-aspeed.txt @@ -0,0 +1,60 @@ +Device tree configuration for PECI buses on the AST24XX and AST25XX SoCs. + +Required properties: +- compatible : Should be "aspeed,ast2400-peci" or "aspeed,ast2500-peci" + - aspeed,ast2400-peci: Aspeed AST2400 family PECI + controller + - aspeed,ast2500-peci: Aspeed AST2500 family PECI + controller +- reg : Should contain PECI controller registers location and + length. +- #address-cells : Should be <1>. +- #size-cells : Should be <0>. +- interrupts : Should contain PECI controller interrupt. +- clocks : Should contain clock source for PECI controller. + Should reference clkin. +- clock_frequency : Should contain the operation frequency of PECI controller + in units of Hz. + 187500 ~ 24000000 + +Optional properties: +- msg-timing-nego : Message timing negotiation period. This value will + determine the period of message timing negotiation to be + issued by PECI controller. The unit of the programmed + value is four times of PECI clock period. + 0 ~ 255 (default: 1) +- addr-timing-nego : Address timing negotiation period. This value will + determine the period of address timing negotiation to be + issued by PECI controller. The unit of the programmed + value is four times of PECI clock period. + 0 ~ 255 (default: 1) +- rd-sampling-point : Read sampling point selection. The whole period of a bit + time will be divided into 16 time frames. This value will + determine the time frame in which the controller will + sample PECI signal for data read back. Usually in the + middle of a bit time is the best. + 0 ~ 15 (default: 8) +- cmd_timeout_ms : Command timeout in units of ms. + 1 ~ 60000 (default: 1000) + +Example: + peci: peci@1e78b000 { + compatible = "simple-bus"; + #address-cells = <1>; + #size-cells = <1>; + ranges = <0x0 0x1e78b000 0x60>; + + peci0: peci-bus@0 { + compatible = "aspeed,ast2500-peci"; + reg = <0x0 0x60>; + #address-cells = <1>; + #size-cells = <0>; + interrupts = <15>; + clocks = <&clk_clkin>; + clock-frequency = <24000000>; + msg-timing-nego = <1>; + addr-timing-nego = <1>; + rd-sampling-point = <8>; + cmd-timeout-ms = <1000>; + }; + }; -- 2.16.2 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html