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[80.197.57.18]) by smtp.gmail.com with ESMTPSA id u53-v6sm1556413edm.51.2018.09.05.07.37.03 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Sep 2018 07:37:04 -0700 (PDT) From: Ricardo Ribalda Delgado To: David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger , Zhouyang Jia , linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org (open list) Cc: Ricardo Ribalda Delgado , devicetree@vger.kernel.org Subject: [PATCH v2 8/8] dt-binding: mtd: Document gpio-addr-flash Date: Wed, 5 Sep 2018 16:36:43 +0200 Message-Id: <20180905143643.9871-9-ricardo.ribalda@gmail.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180905143643.9871-1-ricardo.ribalda@gmail.com> References: <20180905143643.9871-1-ricardo.ribalda@gmail.com> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Add documentation for gpio-addr-flash. This binding allow creating flash devices that are paged using GPIOs. Cc: devicetree@vger.kernel.org Signed-off-by: Ricardo Ribalda Delgado --- .../bindings/mtd/gpio-addr-flash.txt | 46 +++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 Documentation/devicetree/bindings/mtd/gpio-addr-flash.txt diff --git a/Documentation/devicetree/bindings/mtd/gpio-addr-flash.txt b/Documentation/devicetree/bindings/mtd/gpio-addr-flash.txt new file mode 100644 index 000000000000..4279e8cad09b --- /dev/null +++ b/Documentation/devicetree/bindings/mtd/gpio-addr-flash.txt @@ -0,0 +1,46 @@ +Memory Mapped flash with some address lines addressed using GPIOs + +Handle the case where a flash device is mostly addressed using physical +line and supplemented by GPIOs. This way you can hook up say a 8MiB flash +to a 2MiB memory range and use the GPIOs to select a particular range. + + - compatible : "cfi-gpio-addr-flash" + - reg : Address range of the mtd chip that is memory mapped, this is, + on the previous example 2MiB. + - bank-width : Width (in bytes) of the bank. Equal to the + device width times the number of interleaved chips. + - probe-type : (optional) "cfi_probe", "jedec_probe". How the mtd chip + is going to be probed. If omitted, assumed to be equal to "cfi_probe". + - #address-cells, #size-cells : Must be present if the device has + sub-nodes representing partitions (see below). In this case + both #address-cells and #size-cells must be equal to 1. + +The device tree may optionally contain sub-nodes describing partitions of the +address space. See partition.txt for more detail. + +Example: + + cfi_flash_0: cfi_flash { + #address-cells = <1>; + #size-cells = <1>; + compatible = "cfi-gpio-addr-flash"; + bank-width = <2>; + reg = < 0x00300000 0x00200000 >; + gpios = <&gpio_0 3 0>, <&gpio_0 4 0>; + partition@0 { + reg = < 0x0 0x200000 >; + label = "Golden Bitstream"; + }; + partition@200000 { + reg = < 0x200000 0x200000 >; + label = "User Bitstream"; + }; + partition@400000 { + reg = < 0x400000 0x200000 >; + label = "V4L Controls"; + }; + partition@600000 { + reg = < 0x600000 0x200000 >; + label = "Production Data"; + }; + } ;