From mboxrd@z Thu Jan 1 00:00:00 1970 From: Cyril Bur Subject: [PATCH 2/4] Documentation: dt: misc: Add Aspeed ast2400/2500 LPC Control bindings Date: Thu, 12 Jan 2017 11:29:08 +1100 Message-ID: <20170112002910.3650-3-cyrilbur@gmail.com> References: <20170112002910.3650-1-cyrilbur@gmail.com> Return-path: In-Reply-To: <20170112002910.3650-1-cyrilbur-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, jassisinghbrar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, arnd-r2nGTMty4D4@public.gmane.org, gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org Cc: joel-U3u1mxZcP9KHXe+LvDLADg@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, openbmc-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, andrew-zrmu5oMJ5Fs@public.gmane.org, benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org, xow-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, jk-mnsaURCQ41sdnm+yROfE0A@public.gmane.org List-Id: devicetree@vger.kernel.org Signed-off-by: Cyril Bur --- .../devicetree/bindings/misc/aspeed-lpc-ctrl.txt | 78 ++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 Documentation/devicetree/bindings/misc/aspeed-lpc-ctrl.txt diff --git a/Documentation/devicetree/bindings/misc/aspeed-lpc-ctrl.txt b/Documentation/devicetree/bindings/misc/aspeed-lpc-ctrl.txt new file mode 100644 index 000000000000..f84ac83211ec --- /dev/null +++ b/Documentation/devicetree/bindings/misc/aspeed-lpc-ctrl.txt @@ -0,0 +1,78 @@ +ASpeed LPC Control +================== +This binding defines the LPC control for ASpeed SoCs. Partitions of +the LPC bus can be access by other processors on the system, address +ranges on the bus can map accesses from another processor to regions +of the ASpeed SoC memory space. + +Reserved Memory: +================ +The driver provides functionality to map the LPC bus to a region of +ASpeed ram. A phandle to a reserved memory node must be provided so +that the driver can safely use this region. + +Flash: +====== +The driver provides functionality to unmap the LPC bus from ASpeed +RAM, historically the default mapping has been to the SPI flash +controller on the ASpeed SoC, a phandle to this node should be +supplied. + +Device Node: +============ + +As LPC bus configuration registers are at the start of the LPC bus +memory space, it makes most sense for the device to be within the LPC +host node. See Documentation/devicetree/bindings/mfd/aspeed-lpc.txt +for more information. This does not have to be the case, provided the +reg property can give the full address of the LPC bus. + +Required properties: +-------------------- + +- compatible: "aspeed,ast2400-lpc-ctrl" for ASpeed ast2400 SoCs + "aspeed,ast2500-lpc-ctrl" for ASpeed ast2500 SoCs + +- reg: Location and size of the configuration registers + for the LPC bus. Note that if the device node is + within the LPC host node then base is relative to + that. + +- memory-region: phandle of the reserved memory region +- flash: phandle of the SPI flash controller + +Example: +-------- + +reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + ranges; + + ... + + flash_memory: region@54000000 { + compatible = "aspeed,ast2400-lpc-ctrl"; + no-map; + reg = <0x54000000 0x04000000>; /* 64M */ + }; +}; + +host_pnor: spi@1e630000 { + reg = < 0x1e630000 0x18 + 0x30000000 0x02000000 >; + #address-cells = <1>; + #size-cells = <0>; + compatible = "aspeed,ast2400-smc"; + + ... + +}; + +lpc-ctrl@0 { + compatible = "aspeed,ast2400-lpc-ctrl"; + memory-region = <&flash_memory>; + flash = <&host_pnor>; + reg = <0x0 0x80>; +}; + -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html