From mboxrd@z Thu Jan 1 00:00:00 1970 From: w.sang@pengutronix.de (Wolfram Sang) Date: Mon, 16 Jul 2012 12:21:51 +0200 Subject: [PATCH 2/2 V3] MXS: Implement DMA support into mxs-i2c In-Reply-To: <201207141409.38554.marex@denx.de> References: <1341850974-11977-1-git-send-email-marex@denx.de> <201207131410.29469.marex@denx.de> <20120714112929.GB29529@pengutronix.de> <201207141409.38554.marex@denx.de> Message-ID: <20120716102151.GC17435@pengutronix.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Marek, > > I am also still interested to check the runtime switching, but it might > > take another month until I can really hack on it. > > Good, there is some bit that probably needs to be flipped to allow this > switching. I managed to get this working with SPI, not with i2c though. With Ah, hearing that it works with SPI is good news. > i2c, if I restarted the controller inbetween each transaction, it worked ... > which is not what I'd like to see there. Agreed. > > > No, it doesn't. See above about small transfers. Consider the easy > > > situation where you have sensor on one bus (so you do PIO because you > > > transfer small data) and you have EEPROM on other bus, where you use DMA > > > because you transfer large data. And the mixed mode isn't there yet. > > > > I fully understand what you want to configure. I did before. Yet, > > devicetree bindings are not platform_data and shouldn't be used like > > them. > > But then, how would you configure this detail on a per-bus basis? Well all This is a question for devicetree-discuss. > patch actually fixes a real issue, I'd like to have it in ASAP and it's been > aboue three months already, which sucks. I am open to ideas improving the situation (which is: a lot more patches, but not a lot more reviewers) Thanks, Wolfram -- Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ | -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 198 bytes Desc: Digital signature URL: