From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754073AbbG0Nuu (ORCPT ); Mon, 27 Jul 2015 09:50:50 -0400 Received: from mailapp01.imgtec.com ([195.59.15.196]:54875 "EHLO mailapp01.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751261AbbG0Nur (ORCPT ); Mon, 27 Jul 2015 09:50:47 -0400 From: Alex Smith To: CC: Zubair Lutfullah Kakakhel , David Woodhouse , Brian Norris , , Alex Smith , Subject: [PATCH v4 2/3] dt-bindings: binding for jz4780-{nand,bch} Date: Mon, 27 Jul 2015 14:50:18 +0100 Message-ID: <1438005019-28162-3-git-send-email-alex.smith@imgtec.com> X-Mailer: git-send-email 2.4.6 In-Reply-To: <1438005019-28162-1-git-send-email-alex.smith@imgtec.com> References: <1438005019-28162-1-git-send-email-alex.smith@imgtec.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [192.168.154.115] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add DT bindings for NAND devices connected to the NEMC on JZ4780 SoCs, as well as the hardware BCH controller, used by the jz4780_{nand,bch} drivers. Signed-off-by: Alex Smith Cc: Zubair Lutfullah Kakakhel Cc: David Woodhouse Cc: Brian Norris Cc: linux-mtd@lists.infradead.org Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- v3 -> v4: - No change v2 -> v3: - Rebase to 4.0-rc6 - Changed ingenic,ecc-size to common nand-ecc-step-size - Changed ingenic,ecc-strength to common nand-ecc-strength - Changed ingenic,busy-gpio to common rb-gpios - Changed ingenic,wp-gpio to common wp-gpios v1 -> v2: - Rebase to 4.0-rc3 --- .../bindings/mtd/ingenic,jz4780-nand.txt | 57 ++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt diff --git a/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt b/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt new file mode 100644 index 000000000000..1e8e2eeffbf7 --- /dev/null +++ b/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt @@ -0,0 +1,57 @@ +* Ingenic JZ4780 NAND/BCH + +This file documents the device tree bindings for NAND flash devices on the +JZ4780. NAND devices are connected to the NEMC controller (described in +memory-controllers/ingenic,jz4780-nemc.txt), and thus NAND device nodes must +be children of the NEMC node. + +Required NAND device properties: +- compatible: Should be set to "ingenic,jz4780-nand". +- reg: For each bank with a NAND chip attached, should specify a bank number, + an offset of 0 and a size of 0x1000000 (i.e. the whole NEMC bank). + +Optional NAND device properties: +- ingenic,bch-device: To make use of the hardware BCH controller, this property + must contain a phandle for the BCH controller node. The required properties + for this node are described below. If this is not specified, software BCH + will be used instead. +- nand-ecc-step-size: ECC block size in bytes. +- nand-ecc-strength: ECC strength (max number of correctable bits). +- rb-gpios: GPIO specifier for the busy pin. +- wp-gpios: GPIO specifier for the write protect pin. + +Example: + +nemc: nemc@13410000 { + ... + + nand: nand@1 { + compatible = "ingenic,jz4780-nand"; + reg = <1 0 0x1000000>; /* Bank 1 */ + + ingenic,bch-device = <&bch>; + nand-ecc-step-size = <1024>; + nand-ecc-strength = <24>; + + rb-gpios = <&gpa 20 GPIO_ACTIVE_LOW>; + wp-gpios = <&gpf 22 GPIO_ACTIVE_LOW>; + }; +}; + +The BCH controller is a separate SoC component used for error correction on +NAND devices. The following is a description of the device properties for a +BCH controller. + +Required BCH properties: +- compatible: Should be set to "ingenic,jz4780-bch". +- reg: Should specify the BCH controller registers location and length. +- clocks: Clock for the BCH controller. + +Example: + +bch: bch@134d0000 { + compatible = "ingenic,jz4780-bch"; + reg = <0x134d0000 0x10000>; + + clocks = <&cgu JZ4780_CLK_BCH>; +}; -- 2.4.6