Main thing that this patchset adds is support for waiting for command completion when there is no wired ready/busy pin. This is implemented by using Meson specific command which operates without wired pin, but supports interrupt driven waiting (default way for waiting without hardware pin is 'nand_soft_waitrdy()' which uses software loop instead of interrupt). To select which mode to use during driver initialization, common NAND controller property is used - 'nand-rb'. It is described in 'nand-controller.yaml'. But for Meson, its description was missed in 'amlogic,meson-nand.yaml', so this patchset also adds support for it. Patch for bindings was tested with dt_binding_check and dtbs_check. Links: v1 (as two separate patches): https://lore.kernel.org/linux-mtd/20230606193507.35024-1-AVKrasnov@xxxxxxxxxxxxxx/ https://lore.kernel.org/linux-mtd/20230607073015.1280085-1-AVKrasnov@xxxxxxxxxxxxxx/ v2 (tagged as v1, but consider it as v2): https://lore.kernel.org/linux-mtd/20230607145026.2899547-1-AVKrasnov@xxxxxxxxxxxxxx/ Changelog: v1 -> v2: * Two separate patches: For bindings: https://lore.kernel.org/linux-mtd/20230606193507.35024-1-AVKrasnov@xxxxxxxxxxxxxx/ For driver: https://lore.kernel.org/linux-mtd/20230607073015.1280085-1-AVKrasnov@xxxxxxxxxxxxxx/ Now fixed/updated and combined to this patchset with v1 version. * In binding patch: * Invalid type of 'nand-rb' is fixed, it was 'bool', now it is 'uint32 array' as required. Also new declaration of 'nand-rb' contains several restrictions like number of elements and min/max value of elements. * Location of 'nand-rb' is moved from the controller object to the chip object as required. * In driver patch: * Update comment which describes when it is needed to send NAND_CMD_READ0 to leave command waiting loop. * Change type of 'no_rb_pin' to 'bool' as in v1. Now it is just a flag which selects mode to wait for command completion. v2 -> v3: * In binding patch: * 'minimum' property is dropped, because 'nand-rb' is unsigned. * In driver patch: * Logic of 'no_rb_pin' parsing is reworked a little bit. For example to return error code from 'of_property_read_u32()'. Arseniy Krasnov (2): dt-bindings: nand: meson: Fix 'nand-rb' property mtd: rawnand: meson: waiting w/o wired ready/busy pin .../bindings/mtd/amlogic,meson-nand.yaml | 6 ++ drivers/mtd/nand/raw/meson_nand.c | 77 ++++++++++++++++++- 2 files changed, 79 insertions(+), 4 deletions(-) -- 2.35.0
