Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752182AbbKPHn0 (ORCPT ); Mon, 16 Nov 2015 02:43:26 -0500 Received: from mailout2.w1.samsung.com ([210.118.77.12]:36708 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751164AbbKPHnT (ORCPT ); Mon, 16 Nov 2015 02:43:19 -0500 X-AuditID: cbfec7f5-f794b6d000001495-34-564989140c78 From: Pavel Fedin To: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Kukjin Kim , Krzysztof Kozlowski Subject: [PATCH v9 1/4] Documentation: dt-bindings: Describe SROMc configuration Date: Mon, 16 Nov 2015 10:43:02 +0300 Message-id: X-Mailer: git-send-email 2.4.4 In-reply-to: References: In-reply-to: References: X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrGLMWRmVeSWpSXmKPExsVy+t/xa7oinZ5hBrN+KVrMP3KO1aL/zUJW i3OvVjJavH5haNH/+DWzxabH11gtLu+aw2Yx4/w+Joul1y8yWUyYvpbFonXvEXYHbo8189Yw elzu62XyWLn8C5vHplWdbB6bl9R79G1ZxejxeZNcAHsUl01Kak5mWWqRvl0CV8bPBekFr2Qr /v16wN7AuEqsi5GTQ0LAROL19lVsELaYxIV768FsIYGljBJH9vN0MXIB2W1MEhMadjCCJNgE 1CVOf/3AApIQEWhnlDjWuJEJxGEWmMgksWT6frAqYYEAiZt/jjGD2CwCqhLr569iArF5BaIl ni9dxA6xTk7iyvXpYOs4Bcwltr8+ABTnAFpnJnFyazYO4QmM/AsYGVYxiqaWJhcUJ6XnGukV J+YWl+al6yXn525ihITu1x2MS49ZHWIU4GBU4uE98cQ9TIg1say4MvcQowQHs5II7w8WzzAh 3pTEyqrUovz4otKc1OJDjNIcLErivDN3vQ8REkhPLEnNTk0tSC2CyTJxcEo1MHrO3R+3uzJN 7WuDeFx8VumdUPNjN9w5zslNdPoSMEP0/IGlSya0t3asWTRnvrzboxgWD07BJyJLRRby75+m dNvWnjE7IfLUxDMx7Vtql3tos9k7rVjF0zF3hfK57alFZyPy1hv66e5u4VvAs9xHauriiIsG +wynK4afWnZE1evJTX4pSc1MLiWW4oxEQy3mouJEAA9oBj9ZAgAA Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3964 Lines: 104 Add documentation for new subnode properties, allowing bank configuration. Based on u-boot implementation, but heavily reworked. Also, fix size of SROMc mapping in the example. Signed-off-by: Pavel Fedin Reviewed-by: Krzysztof Kozlowski Acked-by: Rob Herring --- .../bindings/arm/samsung/exynos-srom.txt | 73 +++++++++++++++++++++- 1 file changed, 71 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos-srom.txt b/Documentation/devicetree/bindings/arm/samsung/exynos-srom.txt index 33886d5..e5c18df 100644 --- a/Documentation/devicetree/bindings/arm/samsung/exynos-srom.txt +++ b/Documentation/devicetree/bindings/arm/samsung/exynos-srom.txt @@ -5,8 +5,77 @@ Required properties: - reg: offset and length of the register set -Example: +Optional properties: +The SROM controller can be used to attach external peripherals. In this case +extra properties, describing the bus behind it, should be specified as below: + +- #address-cells: Must be set to 2 to allow device address translation. + Address is specified as (bank#, offset). + +- #size-cells: Must be set to 1 to allow device size passing + +- ranges: Must be set up to reflect the memory layout with four integer values + per bank: + 0 + +Sub-nodes: +The actual device nodes should be added as subnodes to the SROMc node. These +subnodes, except regular device specification, should contain the following +properties, describing configuration of the relevant SROM bank: + +Required properties: +- reg: bank number, base address (relative to start of the bank) and size of + the memory mapped for the device. Note that base address will be + typically 0 as this is the start of the bank. + +- samsung,srom-timing : array of 6 integers, specifying bank timings in the + following order: Tacp, Tcah, Tcoh, Tacc, Tcos, Tacs. + Each value is specified in cycles and has the following + meaning and valid range: + Tacp : Page mode access cycle at Page mode (0 - 15) + Tcah : Address holding time after CSn (0 - 15) + Tcoh : Chip selection hold on OEn (0 - 15) + Tacc : Access cycle (0 - 31, the actual time is N + 1) + Tcos : Chip selection set-up before OEn (0 - 15) + Tacs : Address set-up before CSn (0 - 15) + +Optional properties: +- reg-io-width : data width in bytes (1 or 2). If omitted, default of 1 is used. + +- samsung,srom-page-mode : page mode configuration for the bank: + 0 - normal (one data) + 1 - four data + If omitted, default of 0 is used. + +Example: basic definition, no banks are configured + sromc@12570000 { + compatible = "samsung,exynos-srom"; + reg = <0x12570000 0x14>; + }; + +Example: SROMc with SMSC911x ethernet chip on bank 3 sromc@12570000 { + #address-cells = <2>; + #size-cells = <1>; + ranges = <0 0 0x04000000 0x20000 // Bank0 + 1 0 0x05000000 0x20000 // Bank1 + 2 0 0x06000000 0x20000 // Bank2 + 3 0 0x07000000 0x20000>; // Bank3 + compatible = "samsung,exynos-srom"; - reg = <0x12570000 0x10>; + reg = <0x12570000 0x14>; + + ethernet@3,0 { + compatible = "smsc,lan9115"; + reg = <3 0 0x10000>; // Bank 3, offset = 0 + phy-mode = "mii"; + interrupt-parent = <&gpx0>; + interrupts = <5 8>; + reg-io-width = <2>; + smsc,irq-push-pull; + smsc,force-internal-phy; + + samsung,srom-page-mode = <1>; + samsung,srom-timing = <9 12 1 9 1 1>; + }; }; -- 2.4.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/