Some prepare/unprepare works may be necessary before/after a set of operations of the spimem device. For example, before/after spi-nor flash's read/write/erase/lock/unlock. Add optional prepare/unprepare methods in spi_controller_mem_ops to allow the controller to do specific works after/before the operations. The upper user can use spi_mem_{prepare, unprepare}() to call the methods of the controller. Signed-off-by: Yicong Yang <yangyicong@xxxxxxxxxxxxx> --- drivers/spi/spi-mem.c | 20 ++++++++++++++++++++ include/linux/spi/spi-mem.h | 11 +++++++++++ 2 files changed, 31 insertions(+) diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c index adaa0c4..f09cef1 100644 --- a/drivers/spi/spi-mem.c +++ b/drivers/spi/spi-mem.c @@ -220,6 +220,26 @@ bool spi_mem_supports_op(struct spi_mem *mem, const struct spi_mem_op *op) } EXPORT_SYMBOL_GPL(spi_mem_supports_op); +int spi_mem_prepare(struct spi_mem *mem) +{ + struct spi_controller *ctlr = mem->spi->controller; + + if (ctlr->mem_ops && ctlr->mem_ops->prepare) + return ctlr->mem_ops->prepare(mem); + + return 0; +} +EXPORT_SYMBOL_GPL(spi_mem_prepare); + +void spi_mem_unprepare(struct spi_mem *mem) +{ + struct spi_controller *ctlr = mem->spi->controller; + + if (ctlr->mem_ops && ctlr->mem_ops->unprepare) + ctlr->mem_ops->unprepare(mem); +} +EXPORT_SYMBOL_GPL(spi_mem_unprepare); + static int spi_mem_access_start(struct spi_mem *mem) { struct spi_controller *ctlr = mem->spi->controller; diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h index af9ff2f..e40b5c3 100644 --- a/include/linux/spi/spi-mem.h +++ b/include/linux/spi/spi-mem.h @@ -215,6 +215,12 @@ static inline void *spi_mem_get_drvdata(struct spi_mem *mem) * limitations) * @supports_op: check if an operation is supported by the controller * @exec_op: execute a SPI memory operation + * @prepare: do some prepare works before a set of operations. for example, + * read/write/erase/lock/unlock operations of spi-nor flash. This + * method is optional. + * @unprepare: do some post works after a set of operations. for example, + * read/write/erase/lock/unlock operations of spi-nor flash. This + * method is optional. * @get_name: get a custom name for the SPI mem device from the controller. * This might be needed if the controller driver has been ported * to use the SPI mem layer and a custom name is used to keep @@ -253,6 +259,8 @@ struct spi_controller_mem_ops { int (*adjust_op_size)(struct spi_mem *mem, struct spi_mem_op *op); bool (*supports_op)(struct spi_mem *mem, const struct spi_mem_op *op); + int (*prepare)(struct spi_mem *mem); + void (*unprepare)(struct spi_mem *mem); int (*exec_op)(struct spi_mem *mem, const struct spi_mem_op *op); const char *(*get_name)(struct spi_mem *mem); @@ -329,6 +337,9 @@ int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op); bool spi_mem_supports_op(struct spi_mem *mem, const struct spi_mem_op *op); +int spi_mem_prepare(struct spi_mem *mem); +void spi_mem_unprepare(struct spi_mem *mem); + int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op); -- 2.8.1 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/