Hi Boris,
On 26.04.2018 18:18, Boris Brezillon wrote:
Hello,
Shrinking a bit the explanation on why the spi-mem abstraction is
needed (a detailed explanation is available here [2]). In addition to
what as been said in my initial explanation I'll add that making it part
of the SPI framework instead of as an extra independent layer is
justified by the fact that some controllers support both SPI memory
operations and regular SPI transfers, and it's cleaner to have both
features exposed through a single driver.
For those who want to have the full picture, here is a branch [1]
containing the SPI NAND framework based on top of this spi-mem layer.
Thanks,
Boris
[1]https://smex12-5-en-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=https%3a%2f%2fgithub.com%2fbbrezillon%2flinux%2ftree%2fspi%2dmem&umid=78d7b933-335d-48ad-a7f9-47b716b20fc3&auth=541e45255b6517100d80c2b1b80b6933b203c492-068a43ed6b9776ab1e94d8bfe0b7982ce0a4715d
[2]https://www.spinics.net/lists/linux-spi/msg12058.html
Boris Brezillon (7):
spi: Extend the core to ease integration of SPI memory controllers
spi: Make support for regular transfers optional when ->mem_ops !=
NULL
spi: bcm-qspi: Implement the spi_mem interface
spi: bcm53xx: Implement the spi_mem interface
spi: ti-qspi: Implement the spi_mem interface
mtd: spi-nor: Use the spi_mem_xx() API
spi: Get rid of the spi_flash_read() API
I have been using these patches quite a bit in different setups:
* with your spi_mem port of fsl-quadspi and SPI NAND/NOR
* with a spi_mem port of stm32-quadspi and SPI NOR
* with generic SPI and SPI NOR
So to make this official, I will add R-b/T-b tags in separate replies to
the individual patches.
Regards,
Frieder
drivers/mtd/devices/Kconfig | 1 +
drivers/mtd/devices/m25p80.c | 236 +++++++++----------------
drivers/spi/Kconfig | 7 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-bcm-qspi.c | 162 ++++++++---------
drivers/spi/spi-bcm53xx.c | 37 ++--
drivers/spi/spi-mem.c | 410 +++++++++++++++++++++++++++++++++++++++++++
drivers/spi/spi-ti-qspi.c | 85 +++++----
drivers/spi/spi.c | 90 +++-------
include/linux/spi/spi-mem.h | 249 ++++++++++++++++++++++++++
include/linux/spi/spi.h | 60 +------
11 files changed, 941 insertions(+), 397 deletions(-)
create mode 100644 drivers/spi/spi-mem.c
create mode 100644 include/linux/spi/spi-mem.h
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