GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-23 15:27:29 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

spi: Extend the core to ease integration of SPI memory controllers

Browse source 
Some controllers are exposing high-level interfaces to access various
kind of SPI memories. Unfortunately they do not fit in the current
spi_controller model and usually have drivers placed in
drivers/mtd/spi-nor which are only supporting SPI NORs and not SPI
memories in general.

This is an attempt at defining a SPI memory interface which works for
all kinds of SPI memories (NORs, NANDs, SRAMs).

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Frieder Schrempf <frieder.schrempf@exceet.de>
Tested-by: Frieder Schrempf <frieder.schrempf@exceet.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Boris Brezillon 2018-04-26 18:18:14 +02:00 • committed by Mark Brown
parent 055ed0dabc
commit c36ff266dc
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
5 changed files with 674 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

7
include/linux/spi/spi.h
View file

@ -27,6 +27,7 @@ struct property_entry;
struct spi_controller;
struct spi_transfer;
struct spi_flash_read_message;
struct spi_controller_mem_ops;
/*
* INTERFACES between SPI master-side drivers and SPI slave protocol handlers,
@ -376,6 +377,9 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
* transfer_one callback.
* @handle_err: the subsystem calls the driver to handle an error that occurs
* in the generic implementation of transfer_one_message().
* @mem_ops: optimized/dedicated operations for interactions with SPI memory.
* This field is optional and should only be implemented if the
* controller has native support for memory like operations.
* @unprepare_message: undo any work done by prepare_message().
* @slave_abort: abort the ongoing transfer request on an SPI slave controller
* @spi_flash_read: to support spi-controller hardwares that provide
@ -564,6 +568,9 @@ struct spi_controller {
void (*handle_err)(struct spi_controller *ctlr,
struct spi_message *message);
/* Optimized handlers for SPI memory-like operations. */
const struct spi_controller_mem_ops *mem_ops;
/* gpio chip select */
int *cs_gpios;