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[23.128.96.18]) by mx.google.com with ESMTP id m12si24484294ejg.378.2021.07.20.10.33.56; Tue, 20 Jul 2021 10:34:21 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=aculab.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229638AbhGTQvn convert rfc822-to-8bit (ORCPT + 99 others); Tue, 20 Jul 2021 12:51:43 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.85.151]:54877 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229627AbhGTQvk (ORCPT ); Tue, 20 Jul 2021 12:51:40 -0400 Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-206-GSzzkNyhNdi0mB4cT-gXiQ-1; Tue, 20 Jul 2021 18:32:15 +0100 X-MC-Unique: GSzzkNyhNdi0mB4cT-gXiQ-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) by AcuMS.aculab.com (fd9f:af1c:a25b:0:994c:f5c2:35d6:9b65) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Tue, 20 Jul 2021 18:32:14 +0100 Received: from AcuMS.Aculab.com ([fe80::994c:f5c2:35d6:9b65]) by AcuMS.aculab.com ([fe80::994c:f5c2:35d6:9b65%12]) with mapi id 15.00.1497.023; Tue, 20 Jul 2021 18:32:14 +0100 From: David Laight To: 'Mark Brown' CC: 'Eddie James' , "devicetree@vger.kernel.org" , "openbmc@lists.ozlabs.org" , "robh+dt@kernel.org" , "linux-kernel@vger.kernel.org" , "linux-spi@vger.kernel.org" Subject: RE: [PATCH 1/2] spi: fsi: Reduce max transfer size to 8 bytes Thread-Topic: [PATCH 1/2] spi: fsi: Reduce max transfer size to 8 bytes Thread-Index: AQHXfL3Ikg6avb1lOkyp/qlhiL4746tL1OlQ///yyICAAFhm4A== Date: Tue, 20 Jul 2021 17:32:13 +0000 Message-ID: <018ee235eabd420bb32f6acf57dfe121@AcuMS.aculab.com> References: <20210716133915.14697-1-eajames@linux.ibm.com> <20210716133915.14697-2-eajames@linux.ibm.com> <20210716171936.GB4137@sirena.org.uk> <81a40f8690d297ebfb6697dbea63279bcf2f24fa.camel@linux.ibm.com> <20210719152010.GB4174@sirena.org.uk> <0a637d7704df4303abe783215080578d@AcuMS.aculab.com> <20210720131303.GB5042@sirena.org.uk> In-Reply-To: <20210720131303.GB5042@sirena.org.uk> Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mark Brown > Sent: 20 July 2021 14:13 > > On Tue, Jul 20, 2021 at 01:04:38PM +0000, David Laight wrote: > > > Having said that, you might want a loop in the driver so that > > application requests for longer transfers are implemented > > with multiple hardware requests. > > No, that's something that should be and indeed is done in the core - > this isn't the only hardware out there with some kind of restriction on > length. Ah, ok, there is another loop before any 'users'. > > I do also wonder why there is support in the main kernel sources > > for hardware that doesn't actually exist. > > We encourage vendors to get support for their devices upstream prior to > hardware availability so that users are able to run upstream when they > get access to hardware, this means users aren't forced to run out of > tree code needlessly and greatly eases deployment. This one just seemed a bit premature. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)