On Thursday 18 July 2013 04:14 PM, Mark Brown wrote: > On Thu, Jul 18, 2013 at 03:31:27PM +0530, Sourav Poddar wrote: >> Since, qspi controller uses quad read. >> >> Configuring the command register, if the transfer of data needs >> dual or quad lines. >> >> This patch has been done on top of the following patch[1], which is just the >> basic idea of adding dual/quad support in spi framework. >> $subject patch will undergo changes as the parent patch goes[1] >> >> [1]: http://comments.gmane.org/gmane.linux.kernel.spi.devel/14047 > Just as with commit IDs you should include a plain text description of > anything you link to so that people reading your e-mail can tell what > you're talking about without going on line. Ok, will keep that in mind for future.
Just to give you a brief description here, Requirement is to have a dual/quad support in spi frameowrk, so that drivers can use multiple lines for data transfers. What patch[1] tries to does, is [1]: http://comments.gmane.org/gmane.linux.kernel.spi.devel/14047 is to add to each transfer the bitwidth it supports, so that that bitwidth information can be parsed in controller driver and can be used for respective read/writes. A typical usecase on my side is, I have a spansion flash connected to qspi. Flash device supports quad read with a certain read opcode(QUAD_READ). So, Whenever the opcode send is QUAD_READ, we will append that information as a bitwidth to the spi transfer. This information will be parsed by the controller driver and will be used to configure the cmd reg to do the particular type of reads. ------------------------------------------------------------------------------ See everything from the browser to the database with AppDynamics Get end-to-end visibility with application monitoring from AppDynamics Isolate bottlenecks and diagnose root cause in seconds. Start your free trial of AppDynamics Pro today! http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk _______________________________________________ spi-devel-general mailing list spi-devel-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/spi-devel-general
