path: root/drivers/amba/bus.c
diff options
authorSteffen Trumtrar <>2019-05-03 11:33:58 +0200
committerSascha Hauer <>2019-05-08 10:52:51 +0200
commit8e3318b5bc593c5366edda37cde717c4f4a36ad5 (patch)
tree3e1a6a33d912b8cdb705ee238bfdf5c2ea2445c3 /drivers/amba/bus.c
parent62a84b8ba20831898e4dd6db76f0226285c79339 (diff)
mtd: spi-nor: introduce SPI 1-2-2 and SPI 1-4-4 protocols
Sync the driver with Linux v4.12 and apply the patch commit cfc5604c488ccd17936b69008af0c9ae050f4a08 Author: Cyrille Pitchen <> AuthorDate: Tue Apr 25 22:08:46 2017 +0200 Commit: Cyrille Pitchen <> CommitDate: Mon May 15 21:56:17 2017 +0200 mtd: spi-nor: introduce SPI 1-2-2 and SPI 1-4-4 protocols This patch changes the prototype of spi_nor_scan(): its 3rd parameter is replaced by a 'struct spi_nor_hwcaps' pointer, which tells the spi-nor framework about the actual hardware capabilities supported by the SPI controller and its driver. Besides, this patch also introduces a new 'struct spi_nor_flash_parameter' telling the spi-nor framework about the hardware capabilities supported by the SPI flash memory and the associated settings required to use those hardware caps. Then, to improve the readability of spi_nor_scan(), the discovery of the memory settings and the memory initialization are now split into two dedicated functions. 1 - spi_nor_init_params() The spi_nor_init_params() function is responsible for initializing the 'struct spi_nor_flash_parameter'. Currently this structure is filled with legacy values but further patches will allow to override some parameter values dynamically, for instance by reading the JESD216 Serial Flash Discoverable Parameter (SFDP) tables from the SPI memory. The spi_nor_init_params() function only deals with the hardware capabilities of the SPI flash memory: especially it doesn't care about the hardware capabilities supported by the SPI controller. 2 - spi_nor_setup() The second function is called once the 'struct spi_nor_flash_parameter' has been initialized by spi_nor_init_params(). With both 'struct spi_nor_flash_parameter' and 'struct spi_nor_hwcaps', the new argument of spi_nor_scan(), spi_nor_setup() computes the best match between hardware caps supported by both the (Q)SPI memory and controller hence selecting the relevant settings for (Fast) Read and Page Program operations. Signed-off-by: Cyrille Pitchen <> Reviewed-by: Marek Vasut <> Signed-off-by: Steffen Trumtrar <> Signed-off-by: Sascha Hauer <>
Diffstat (limited to 'drivers/amba/bus.c')
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