Re: [PATCH stblinux.git 1/2] dt-bindings: firmware: add Broadcom's NVRAM memory mapping
From: Rafał Miłecki <zajec5@gmail.com>
Date: 2021-03-08 21:41:43
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linux-devicetree, linux-mips, lkml
On 08.03.2021 22:37, Rafał Miłecki wrote:
On 08.03.2021 19:43, Rob Herring wrote:quoted
On Tue, Mar 02, 2021 at 08:44:04AM +0100, Rafał Miłecki wrote:quoted
From: Rafał Miłecki <rafal@milecki.pl> NVRAM structure contains device data and can be accessed using MMIO. Signed-off-by: Rafał Miłecki <rafal@milecki.pl> --- .../bindings/firmware/brcm,nvram.yaml | 41 +++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 Documentation/devicetree/bindings/firmware/brcm,nvram.yamldiff --git a/Documentation/devicetree/bindings/firmware/brcm,nvram.yaml b/Documentation/devicetree/bindings/firmware/brcm,nvram.yaml new file mode 100644 index 000000000000..12af8e2e7c9c --- /dev/null +++ b/Documentation/devicetree/bindings/firmware/brcm,nvram.yaml@@ -0,0 +1,41 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: "http://devicetree.org/schemas/firmware/brcm,nvram.yaml#" +$schema: "http://devicetree.org/meta-schemas/core.yaml#" + +title: Broadcom's NVRAM + +maintainers: + - Rafał Miłecki <rafal@milecki.pl> + +description: | + NVRAM is a structure containing device specific environment variables. + It is used for storing device configuration, booting parameters and + calibration data.The structure of the data is fully discoverable just from a genericish 'brcm,nvram'?Yes, NVRAM structure is a header (with magic and length) and a list of key-value pairs separated by \0. If you map memory at given address you should verify magic and start reading key-value pairs. Content example: foo=bar\0baz=qux\0quux(...) There is no predefined order of pairs, set of keys or anything similar I could think of. I can't think of anything more worth describing in DT.
Ah, I've just realized, I'm replying to the "firmware" binding patch. Florian suggested to look at NVMEM subsystem instead. Please kindly check [PATCH V2 1/2] dt-bindings: nvmem: add Broadcom's NVRAM _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel