From: Eberhard Stoll <eberhard.stoll@xxxxxxxxxx> Hi All, this patch series adds parameters to tweak SPI timings for some (Q)SPI devices. For example it optimizes the support for the operation of a Winbond W25N02KV SPI NAND chip on NXP i.mx6 ul(l) devices. The Winbond W25N02KV SPI NAND has the characteristic to introduce a delay between spi clock and the masters spi receive data (called tCLQV value in data sheet). This chip can operate with a maximum SPI clock of 104MHz. Disregarding the requred tCLQV value of 7ns for this chip reduces the possible spi clock to approx. 70MHz. To support the full bandwith of this chip, the tCLQV parameter has to be supported in SPI framework and SPI controller and the SPI NAND chip needs this parameter in the device configuration data. Also other devices can improve their operating SPI clock performance with this setting if they also has significant tCLQV values and the SPI controller will support it. This patch series adds support the tCLQV parameter in: - SPI framework - SPI NAND framework - NXP i.mx6 QSPI controller - Winbond W25N02KV SPI NAND device Eberhard Stoll (4): spi: Add parameter for clock to rx delay mtd: spinand: Add support for clock to rx delay setting mtd: spinand: winbond: Add rx sample delay for W25N02KV spi: spi-fsl-qspi: Add support for rx data sample point adjustment drivers/mtd/nand/spi/core.c | 2 + drivers/mtd/nand/spi/winbond.c | 3 +- drivers/spi/spi-fsl-qspi.c | 80 ++++++++++++++++++++++++++++++++++ include/linux/mtd/spinand.h | 5 +++ include/linux/spi/spi.h | 3 ++ 5 files changed, 92 insertions(+), 1 deletion(-) base-commit: 05d3ef8bba77c1b5f98d941d8b2d4aeab8118ef1 -- 2.25.1
