Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1181380 > unrolled thread

Re: [RFC PATCH 0/2] spi: add dual parallel & stacked mode support in Zynq MPSoC GQSPI controller

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: [RFC PATCH 0/2] spi: add dual parallel & stacked mode support  in Zynq MPSoC GQSPI controller Mike Looijmans <mike.looijmans@topic.nl> - 2015-07-10 10:40 +0200

#1181380 — Re: [RFC PATCH 0/2] spi: add dual parallel & stacked mode support in Zynq MPSoC GQSPI controller

On 09-07-15 14:44, Ranjit Waghmode wrote:
> This series of patches is to add dual parallel and stacked mode support for
> Zynq Ultrascale+ MPSoC GQSPI controller driver.
>
> These are all very high level changes and expected to make an idea clear.
> Comments and suggestions are welcomed.
>
...
>
> What is stacked mode?
> ---------------------
> ZynqMP GQSPI controller supports stacked mode with following functionalities:
> 1) The Generic Quad-SPI controller also supports two SPI flash memories
>     in a shared bus arrangement to reduce IO pin count.
> 2) Separate chip select lines
> 3) Shared I/O lines
> 4) This mode is targeted for increasing the flash memory and no performance
>     improvement when compared with single.

One could also model the stacked mode as having two distinct flash chips with 
separate chip selects and shared lines.
Merging them into a single storage device can be done on block layer or higher 
level. This allows the flash chips to be used in any configuration using 
existing support for concatenating multiple devices.
I think this would be a more generic way of doing this. It also allows much 
more flexibility, for example the devices could be used in a mirror setup, or 
in combination with additional devices on other controllers.


Kind regards,

Mike Looijmans
System Expert

TOPIC Embedded Products
Eindhovenseweg 32-C, NL-5683 KH Best
Postbus 440, NL-5680 AK Best
Telefoon: +31 (0) 499 33 69 79
Telefax: +31 (0) 499 33 69 70
E-mail: mike.looijmans@topicproducts.com
Website: www.topicproducts.com

Please consider the environment before printing this e-mail





--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[toc] | [standalone]

Back to top | Article view | linux.kernel

csiph-web