Re: [RFC PATCH v2 09/14] mtd: nand: add sunxi NFC dt bindings doc

Date: Wed Jan 29 2014 - 13:01:57 EST

Hello Rob,

Le 29/01/2014 18:11, Rob Herring a écrit :
On Wed, Jan 29, 2014 at 8:34 AM, Boris BREZILLON
<> wrote:
Add the sunxi NAND Flash Controller dt bindings documentation.

Signed-off-by: Boris BREZILLON <>
.../devicetree/bindings/mtd/sunxi-nand.txt | 46 ++++++++++++++++++++
1 file changed, 46 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mtd/sunxi-nand.txt

diff --git a/Documentation/devicetree/bindings/mtd/sunxi-nand.txt b/Documentation/devicetree/bindings/mtd/sunxi-nand.txt
new file mode 100644
index 0000000..b0e55a3
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/sunxi-nand.txt
@@ -0,0 +1,46 @@
+Allwinner NAND Flash Controller (NFC)
+Required properties:
+- compatible : "allwinner,sun4i-nand".
+- reg : shall contain registers location and length for data and reg.
+- interrupts : shall define the nand controller interrupt.
+- #address-cells: shall be set to 1. Encode the nand CS.
+- #size-cells : shall be set to 0.
+- clocks : shall reference nand controller clocks.
+- clock-names : nand controller internal clock names. Shall contain :
+ * "ahb_clk" : AHB gating clock
+ * "sclk" : nand controller clock
+Optional children nodes:
+Children nodes represent the available nand chips.
+Optional properties:
For the controller or per nand chip?

+- onfi,nand-timing-mode : mandatory if the chip does not support the ONFI
+ standard.
Add to generic nand binding.

+- allwinner,rb : shall contain the native Ready/Busy ids.
+ or
+- rb-gpios : shall contain the gpios used as R/B pins.
Isn't allwinner,rb implied by a lack of rb-gpios property. Or no R/B
pin is an option?
Both are optional. In case none of the properties are defined the dev_ready
callback is set to NULL and the nand_base waiting loop is used.

If so, don't you need some fixed time delay
properties like max erase time?

This is handled in nand_base (using the chip_delay field), but I guess we could
use the information retrieved from nand timings and the operation in progress...

rb-gpios could be added to the generic nand binding as well.


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