From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Brown Subject: Re: [PATCH 4/4] spi: sh-msiof: Document hardware limitations related to chip selects Date: Thu, 14 Dec 2017 11:45:44 +0000 Message-ID: <20171214114544.GC9788@sirena.org.uk> References: <1513191913-10612-1-git-send-email-geert+renesas@glider.be> <1513191913-10612-5-git-send-email-geert+renesas@glider.be> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="KDt/GgjP6HVcx58l" Cc: Rob Herring , Mark Rutland , linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-renesas-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Geert Uytterhoeven Return-path: Content-Disposition: inline In-Reply-To: <1513191913-10612-5-git-send-email-geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-spi.vger.kernel.org --KDt/GgjP6HVcx58l Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Dec 13, 2017 at 08:05:13PM +0100, Geert Uytterhoeven wrote: > + Hardware limitations related to chip selects: > + - Native chip selects are always deasserted in > + between transfers that are part of the same > + message. Use cs-gpios to work around this. Ideally the driver would be generating an error when it sees multi-transfer messages. --KDt/GgjP6HVcx58l Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAloyZGcACgkQJNaLcl1U h9AT7Af/TK1+7gMVOO2nLm4h2HMrGHPUHeUhJJgnR7vsZozlcCnsq0/bxn0NXB56 1PbwCYZvC2QrfsvHI7AvO+R/XnORlFzGgvHF3i95+S4zkP3Bwpg/11tsgKOHeRxK E0csFyJZAD0+8gGnTGNRMaLLmudUSJxJ9wNWSw94fMMrzbdlXoC3rjlrczJ0snkk MBawsXyfVDQb6rG1UvY3jCf6scZvhjF2D1rrmh9BnzB0A/prc6DoO5wdXrKBOxTb G0Tb+BAuDDn2CmgoEqCfYLK6/rhU+E5MoknJuVFny3WXD5QXdAMiaB6U54l9CkYM eppmnsSjtjRs/K32pH7q9r0Y1CcpIw== =p2YY -----END PGP SIGNATURE----- --KDt/GgjP6HVcx58l-- -- 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