Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752094AbcLEOLb (ORCPT ); Mon, 5 Dec 2016 09:11:31 -0500 Received: from mail-dm3nam03on0045.outbound.protection.outlook.com ([104.47.41.45]:19206 "EHLO NAM03-DM3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752003AbcLEOL0 (ORCPT ); Mon, 5 Dec 2016 09:11:26 -0500 X-Greylist: delayed 974 seconds by postgrey-1.27 at vger.kernel.org; Mon, 05 Dec 2016 09:11:26 EST Authentication-Results: spf=pass (sender IP is 149.199.60.100) smtp.mailfrom=xilinx.com; gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=bestguesspass action=none header.from=xilinx.com; X-IncomingTopHeaderMarker: OriginalChecksum:;UpperCasedChecksum:;SizeAsReceived:2918;Count:27 From: Punnaiah Choudary Kalluri To: Boris Brezillon , Marek Vasut CC: "dwmw2@infradead.org" , "computersforpeace@gmail.com" , "richard@nod.at" , "cyrille.pitchen@atmel.com" , "robh+dt@kernel.org" , "mark.rutland@arm.com" , "linux-kernel@vger.kernel.org" , "linux-mtd@lists.infradead.org" , "devicetree@vger.kernel.org" , Michal Simek , "kalluripunnaiahchoudary@gmail.com" , "kpc528@gmail.com" Subject: RE: [PATCH v6 1/2] mtd: arasan: Add device tree binding documentation Thread-Topic: [PATCH v6 1/2] mtd: arasan: Add device tree binding documentation Thread-Index: AQHSTq2g6e6vVWrcRUiAKp1AmH0yKKD4O94AgABGBACAAN81AA== Date: Mon, 5 Dec 2016 13:56:51 +0000 Message-ID: <03CA77BA8AF6F1469AEDFBDA1322A7B76423EE53@XAP-PVEXMBX02.xlnx.xilinx.com> References: <1480911066-26157-1-git-send-email-punnaia@xilinx.com> <74842d92-840d-a7c2-fb1b-ddab1ac2cf42@gmail.com> <20161205093630.650451d7@bbrezillon> In-Reply-To: <20161205093630.650451d7@bbrezillon> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [172.23.230.43] Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 X-RCIS-Action: ALLOW X-TM-AS-Product-Ver: 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X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by mail.home.local id uB5EBcuK030342 Content-Length: 4223 Lines: 131 > -----Original Message----- > From: Boris Brezillon [mailto:boris.brezillon@free-electrons.com] > Sent: Monday, December 05, 2016 2:07 PM > To: Marek Vasut > Cc: Punnaiah Choudary Kalluri ; > dwmw2@infradead.org; computersforpeace@gmail.com; richard@nod.at; > cyrille.pitchen@atmel.com; robh+dt@kernel.org; mark.rutland@arm.com; > linux-kernel@vger.kernel.org; linux-mtd@lists.infradead.org; > devicetree@vger.kernel.org; Michal Simek ; > kalluripunnaiahchoudary@gmail.com; kpc528@gmail.com; Punnaiah > Choudary Kalluri > Subject: Re: [PATCH v6 1/2] mtd: arasan: Add device tree binding > documentation > > On Mon, 5 Dec 2016 05:25:54 +0100 > Marek Vasut wrote: > > > On 12/05/2016 05:11 AM, Punnaiah Choudary Kalluri wrote: > > > This patch adds the dts binding document for arasan nand flash > > > controller. > > > > > > Signed-off-by: Punnaiah Choudary Kalluri > > > Acked-by: Rob Herring > > > --- > > > changes in v6: > > > - Removed num-cs property > > > - Separated nandchip from nand controller changes in v5: > > > - None > > > Changes in v4: > > > - Added num-cs property > > > - Added clock support > > > Changes in v3: > > > - None > > > Changes in v2: > > > - None > > > --- > > > .../devicetree/bindings/mtd/arasan_nfc.txt | 38 > ++++++++++++++++++++++ > > > 1 file changed, 38 insertions(+) > > > create mode 100644 > > > Documentation/devicetree/bindings/mtd/arasan_nfc.txt > > > > > > diff --git a/Documentation/devicetree/bindings/mtd/arasan_nfc.txt > > > b/Documentation/devicetree/bindings/mtd/arasan_nfc.txt > > > new file mode 100644 > > > index 0000000..dcbe7ad > > > --- /dev/null > > > +++ b/Documentation/devicetree/bindings/mtd/arasan_nfc.txt > > > @@ -0,0 +1,38 @@ > > > +Arasan Nand Flash Controller with ONFI 3.1 support > > > > Arasan NAND Flash ... > > > > > +Required properties: > > > +- compatible: Should be "arasan,nfc-v3p10" > > > > This v3p10 looks like version 3 patchlevel 10, but shouldn't we have > > some fallback option which doesn't encode IP version in the compat > > string ? > > Not necessarily. Usually you define a generic compatible when you have > other reliable means to detect the IP version (a version register for > example). > If you can't detect that at runtime, then providing only specific compatible > strings is a good solution to avoid breaking the DT ABI. Yes. I am also thinking the same. Arasan controller doesn't have the register to indicate the IP version number. > > > > > Also, shouldn't quirks be handled by DT props instead of effectively > > encoding them into the compatible string ? > > Well, from my experience, it's better to hide as much as possible behind the > compatible. This way, if new quirks are needed for a specific revision, you can > update the driver without having to change the DT. > Agree. Regards, Punnaiah > > > > > +- reg: Memory map for module access > > > +- interrupt-parent: Interrupt controller the interrupt is routed > > > +through > > > +- interrupts: Should contain the interrupt for the device > > > +- clock-name: List of input clocks - "clk_sys", "clk_flash" > > > + (See clock bindings for details) > > > +- clocks: Clock phandles (see clock bindings for details) > > > + > > > +Optional properties: > > > +- arasan,has-mdma: Enables Dma support > > > > 'Enables DMA support' , with DMA in caps. > > > > > +for nand partition information please refer the below file > > > > For NAND ... > > > > > +Documentation/devicetree/bindings/mtd/partition.txt > > > + > > > +Example: > > > + nand0: nand@ff100000 { > > > + compatible = "arasan,nfc-v3p10" > > > + reg = <0x0 0xff100000 0x1000>; > > > + clock-name = "clk_sys", "clk_flash" > > > + clocks = <&misc_clk &misc_clk>; > > > + interrupt-parent = <&gic>; > > > + interrupts = <0 14 4>; > > > + arasan,has-mdma; > > > + #address-cells = <1>; > > > + #size-cells = <0> > > > + > > > + nand@0 { > > > + reg = <0> > > > + partition@0 { > > > + label = "filesystem"; > > > + reg = <0x0 0x0 0x1000000>; > > > + }; > > > + (...) > > > + }; > > > + }; > > > > > > >