From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dinh Nguyen Subject: Re: [PATCH] reset: socfpga: use arch_initcall for early initialization Date: Thu, 9 Oct 2014 08:16:18 -0500 Message-ID: <54368AA2.9000104@opensource.altera.com> References: <1412822646-11257-1-git-send-email-dinguyen@opensource.altera.com> <1412845410.6809.3.camel@pengutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1412845410.6809.3.camel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Philipp Zabel Cc: dinh.linux-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, s.trumtrar-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org, grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, atull-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.org Hi Philipp, On 10/9/14, 4:03 AM, Philipp Zabel wrote: > Am Mittwoch, den 08.10.2014, 21:44 -0500 schrieb > dinguyen-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org: >> From: Dinh Nguyen >> >> There are certain drivers that are required to get loaded very early using >> arch_initcall. An example of such a driver is the SOCFPGA's FPGA bridge driver. >> This driver has to get loaded early because it needs to enable FPGA components >> that are connected to the bridge. >> >> This FPGA bridge driver will using the reset controller API to toggle it's >> reset bits, thus, it needs the reset driver to be loaded as early as possible >> in order for it to get used properly. > > Without knowing the details, this sounds like the wrong approach. Can't > the bridge driver return -EPROBE_DEFER until the reset controller is > available? > The bridge driver is also using arch_initcall, as it also needs to get loaded early for FPGA IPs to work, and so later driver loading will work for the FPGA IPs. Dinh -- 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