This patchset adds a spi-mem driver for Mediatek SPI-NOR controller, which already has limited support by mtk-quadspi. This new driver can make use of full quadspi capability of this controller. 1st new commit makes spi-max-frequency optional to match current binding doc and make this new driver compatible with old driver dt bindings. Changes since v1: two new commits. Chuanhong Guo (4): spi: make spi-max-frequency optional spi: add support for mediatek spi-nor controller dt-bindings: convert mtk-quadspi binding doc for spi-mtk-nor mtd: spi-nor: remove mtk-quadspi driver .../mtk-quadspi.txt => spi/spi-mtk-nor.txt} | 34 +- drivers/mtd/spi-nor/Kconfig | 8 - drivers/mtd/spi-nor/Makefile | 1 - drivers/mtd/spi-nor/mtk-quadspi.c | 565 -------------- drivers/spi/Kconfig | 10 + drivers/spi/Makefile | 1 + drivers/spi/spi-mtk-nor.c | 689 ++++++++++++++++++ drivers/spi/spi.c | 9 +- 8 files changed, 717 insertions(+), 600 deletions(-) rename Documentation/devicetree/bindings/{mtd/mtk-quadspi.txt => spi/spi-mtk-nor.txt} (62%) delete mode 100644 drivers/mtd/spi-nor/mtk-quadspi.c create mode 100644 drivers/spi/spi-mtk-nor.c -- 2.24.1