summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2012-01-10 13:45:22 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-10 13:45:22 -0800
commit7b3480f8b701170c046e1ed362946f5f0d005e13 (patch)
treebd25e05b4f35699689b485480dddf24f840f80af /Documentation/devicetree
parent1c8106528aa6bf16b3f457de80df1cf7462a49a4 (diff)
parentb60ef99c1164a8ad346cf41f9e71acfffb6d25a6 (diff)
downloadop-kernel-dev-7b3480f8b701170c046e1ed362946f5f0d005e13.zip
op-kernel-dev-7b3480f8b701170c046e1ed362946f5f0d005e13.tar.gz
Merge tag 'for-linus-3.3' of git://git.infradead.org/mtd-2.6
MTD pull for 3.3 * tag 'for-linus-3.3' of git://git.infradead.org/mtd-2.6: (113 commits) mtd: Fix dependency for MTD_DOC200x mtd: do not use mtd->block_markbad directly logfs: do not use 'mtd->block_isbad' directly mtd: introduce mtd_can_have_bb helper mtd: do not use mtd->suspend and mtd->resume directly mtd: do not use mtd->lock, unlock and is_locked directly mtd: do not use mtd->sync directly mtd: harmonize mtd_writev usage mtd: do not use mtd->lock_user_prot_reg directly mtd: mtd->write_user_prot_reg directly mtd: do not use mtd->read_*_prot_reg directly mtd: do not use mtd->get_*_prot_info directly mtd: do not use mtd->read_oob directly mtd: mtdoops: do not use mtd->panic_write directly romfs: do not use mtd->get_unmapped_area directly mtd: do not use mtd->get_unmapped_area directly mtd: do use mtd->point directly mtd: introduce mtd_has_oob helper mtd: mtdcore: export symbols cleanup mtd: clean-up the default_mtd_writev function ... Fix up trivial edit/remove conflict in drivers/staging/spectra/lld_mtd.c
Diffstat (limited to 'Documentation/devicetree')
-rw-r--r--Documentation/devicetree/bindings/mtd/gpio-control-nand.txt44
1 files changed, 44 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mtd/gpio-control-nand.txt b/Documentation/devicetree/bindings/mtd/gpio-control-nand.txt
new file mode 100644
index 0000000..719f4dc
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/gpio-control-nand.txt
@@ -0,0 +1,44 @@
+GPIO assisted NAND flash
+
+The GPIO assisted NAND flash uses a memory mapped interface to
+read/write the NAND commands and data and GPIO pins for the control
+signals.
+
+Required properties:
+- compatible : "gpio-control-nand"
+- reg : should specify localbus chip select and size used for the chip. The
+ resource describes the data bus connected to the NAND flash and all accesses
+ are made in native endianness.
+- #address-cells, #size-cells : Must be present if the device has sub-nodes
+ representing partitions.
+- gpios : specifies the gpio pins to control the NAND device. nwp is an
+ optional gpio and may be set to 0 if not present.
+
+Optional properties:
+- bank-width : Width (in bytes) of the device. If not present, the width
+ defaults to 1 byte.
+- chip-delay : chip dependent delay for transferring data from array to
+ read registers (tR). If not present then a default of 20us is used.
+- gpio-control-nand,io-sync-reg : A 64-bit physical address for a read
+ location used to guard against bus reordering with regards to accesses to
+ the GPIO's and the NAND flash data bus. If present, then after changing
+ GPIO state and before and after command byte writes, this register will be
+ read to ensure that the GPIO accesses have completed.
+
+Examples:
+
+gpio-nand@1,0 {
+ compatible = "gpio-control-nand";
+ reg = <1 0x0000 0x2>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ gpios = <&banka 1 0 /* rdy */
+ &banka 2 0 /* nce */
+ &banka 3 0 /* ale */
+ &banka 4 0 /* cle */
+ 0 /* nwp */>;
+
+ partition@0 {
+ ...
+ };
+};
OpenPOWER on IntegriCloud