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[92.233.226.227]) by smtp.gmail.com with ESMTPSA id n15sm12952487wrx.2.2021.01.29.09.14.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Jan 2021 09:14:46 -0800 (PST) From: Srinivas Kandagatla To: gregkh@linuxfoundation.org Cc: linux-kernel@vger.kernel.org, Nicolas Saenz Julienne , Rob Herring , Srinivas Kandagatla Subject: [PATCH 3/5] dt-bindings: nvmem: Add bindings for rmem driver Date: Fri, 29 Jan 2021 17:14:28 +0000 Message-Id: <20210129171430.11328-4-srinivas.kandagatla@linaro.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20210129171430.11328-1-srinivas.kandagatla@linaro.org> References: <20210129171430.11328-1-srinivas.kandagatla@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nicolas Saenz Julienne Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. Introduce the dt-bindings to nvmem's rmem. Signed-off-by: Nicolas Saenz Julienne Reviewed-by: Rob Herring Signed-off-by: Srinivas Kandagatla --- .../devicetree/bindings/nvmem/rmem.yaml | 49 +++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 Documentation/devicetree/bindings/nvmem/rmem.yaml diff --git a/Documentation/devicetree/bindings/nvmem/rmem.yaml b/Documentation/devicetree/bindings/nvmem/rmem.yaml new file mode 100644 index 000000000000..1d85a0a30846 --- /dev/null +++ b/Documentation/devicetree/bindings/nvmem/rmem.yaml @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/nvmem/rmem.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Reserved Memory Based nvmem Device + +maintainers: + - Nicolas Saenz Julienne + +allOf: + - $ref: "nvmem.yaml#" + +properties: + compatible: + items: + - enum: + - raspberrypi,bootloader-config + - const: nvmem-rmem + + no-map: + $ref: /schemas/types.yaml#/definitions/flag + description: + Avoid creating a virtual mapping of the region as part of the OS' + standard mapping of system memory. + +required: + - compatible + - no-map + +unevaluatedProperties: false + +examples: + - | + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + + blconfig: nvram@10000000 { + compatible = "raspberrypi,bootloader-config", "nvmem-rmem"; + #address-cells = <1>; + #size-cells = <1>; + reg = <0x10000000 0x1000>; + no-map; + }; + }; + +... -- 2.21.0