From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Brown Subject: Re: [PATCHv1 2/3] spi: Add spi driver for Socionext Synquacer platform Date: Wed, 10 Jan 2018 10:08:11 +0000 Message-ID: <20180110100811.GA9003@sirena.org.uk> References: <1515503383-8909-1-git-send-email-jassisinghbrar@gmail.com> <1515503448-9025-1-git-send-email-jassisinghbrar@gmail.com> <1515527945.25398.59.camel@impinj.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="k+w/mQv8wyuph6w0" Return-path: Content-Disposition: inline In-Reply-To: <1515527945.25398.59.camel-cgc2CodaaHDQT0dZR+AlfA@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Trent Piepho Cc: "jassisinghbrar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" , "linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "mark.rutland-5wv7dgnIgG8@public.gmane.org" , "jaswinder.singh-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org" , "ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org" , "robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org" , "masami.hiramatsu-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org" List-Id: devicetree@vger.kernel.org --k+w/mQv8wyuph6w0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tue, Jan 09, 2018 at 07:59:05PM +0000, Trent Piepho wrote: > Usually when a device has a fifo that must be emptied before it > overflows, it is either emptied from an interrupt handler or the > interrupt handler will queue a work function or tasklet that will empty > it. Doing it from user context has a maximum latency that is too high. It wouldn't be the first SPI controller that lacked interrupt support, this is depressingly common. --k+w/mQv8wyuph6w0 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAlpV5ggACgkQJNaLcl1U h9AsXwf/WfMgkMYa8rvhyNICuLNn+InEZgGVNJvBV5HRwCV8gE98f0V6efON76Cw YfX8OHYcNXZt006cPJbkjzptKzFv73zsRAt5TV3zOuPm3j02iKPSQWpLWX2hHCZH RO+nWq1aGnYHkdq1f1Bjm/71kUSo2QRE2yJ7XLvv+GsoRhfZfF6UVeXcUigjFIq7 GF2OWUYngx09URu6zBBPwC4k/BTRq3eDMKs21d7chBCmcH3SKG8oW/lMmJaFKJTl QmHCAM2Fg/Dha4ZXQwLrZArNgMJRR/f+xulIU/3FZssGXObtaDG+Egwtns3v4w66 O+okhpkmc2eJAoKdcPWy8ASZ93pQXw== =xhmk -----END PGP SIGNATURE----- --k+w/mQv8wyuph6w0-- -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html