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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org This RFC is the continuation to the discussion which happened on 'commit f89504300e94 ("spi: Stacked/parallel memories bindings")' for adding dtbinding support for stacked/parallel memories. The purpose of this patch series is to demonstrate the changes in spi-nor, spi core and ZynqMP GQSPI driver w.r.t to stacked/parallel memories support.Please go through the series and share you comments. To support stacked/parallel configuration following changes are done to spi core and spi-nor. - The chip select member (chip_select) of the spi_device structure is changed to an array (chip_select[2]). This array is used to store the CS values coming form the "reg" DT property. - Added a new member (cs_index_mask) in the spi_device structure to hold the index information of above chip_select array. SPI-NOR is not aware of the chip_select values, For any incoming request SPI-NOR will decide the flash index with the help of individual flash size and the configuration type (single/stacked/parallel). SPI-NOR will pass on the flash index information to the SPI core by setting the appropriate bit(s) of "cs_index_mask". For example if nth bit of "cs_index_mask" is set then the driver would assert chip_slect[n]. - The flash parameter member(*params) of the spi_nor structure is changed to an array (*params[2]). The array is used to store the parameters of each flash connected in stacked/parallel configuration. This patch series targets flashes of same make connected in stacked configuration and for parallel configuration both the flashes should be identical. --- BRANCH: mtd/next --- Amit Kumar Mahapatra (2): spi: Add multiple CS support for a single SPI device mtd: spi-nor: Add support for stacked/parallel memories drivers/mtd/spi-nor/core.c | 104 +++++++++++++++++++++++++++++---- drivers/mtd/spi-nor/core.h | 5 ++ drivers/spi/spi-zynqmp-gqspi.c | 30 ++++++++-- drivers/spi/spi.c | 10 +++- include/linux/mtd/spi-nor.h | 8 ++- include/linux/spi/spi.h | 10 +++- 6 files changed, 146 insertions(+), 21 deletions(-) -- 2.17.1 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/