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| Started by | Harvey Hunt <harvey.hunt@imgtec.com> |
|---|---|
| First post | 2016-01-04 13:40 +0100 |
| Last post | 2016-01-07 02:30 +0100 |
| Articles | 2 — 2 participants |
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[PATCH v11 1/3] dt-bindings: binding for jz4780-{nand,bch} Harvey Hunt <harvey.hunt@imgtec.com> - 2016-01-04 13:40 +0100
Re: [PATCH v11 1/3] dt-bindings: binding for jz4780-{nand,bch} Brian Norris <computersforpeace@gmail.com> - 2016-01-07 02:30 +0100
| From | Harvey Hunt <harvey.hunt@imgtec.com> |
|---|---|
| Date | 2016-01-04 13:40 +0100 |
| Subject | [PATCH v11 1/3] dt-bindings: binding for jz4780-{nand,bch} |
| Message-ID | <qNcAy-3to-11@gated-at.bofh.it> |
From: Alex Smith <alex.smith@imgtec.com>
Add DT bindings for NAND devices connected to the NEMC on JZ4780 SoCs,
as well as the hardware BCH controller, used by the jz4780_{nand,bch}
drivers.
Signed-off-by: Alex Smith <alex.smith@imgtec.com>
Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: linux-mtd@lists.infradead.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: robh@kernel.org
Signed-off-by: Harvey Hunt <harvey.hunt@imgtec.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
---
v10 -> v11:
- Added Boris Brezillon's Reviewed-By.
v9 -> v10:
- Added Rob Herring's Acked-by.
v8 -> v9:
- Document that partitions are represented as a child node of a NAND chip.
v7 -> v8:
- Describe how NAND chips are now child nodes of the NAND controller.
v6 -> v7:
- Add nand-ecc-mode to DT bindings.
- Add nand-on-flash-bbt to DT bindings.
v5 -> v6:
- No change.
v4 -> v5:
- Rename ingenic,bch-device to ingenic,bch-controller to fit with
existing convention.
v3 -> v4:
- No change
v2 -> v3:
- Rebase to 4.0-rc6
- Changed ingenic,ecc-size to common nand-ecc-step-size
- Changed ingenic,ecc-strength to common nand-ecc-strength
- Changed ingenic,busy-gpio to common rb-gpios
- Changed ingenic,wp-gpio to common wp-gpios
v1 -> v2:
- Rebase to 4.0-rc3
.../bindings/mtd/ingenic,jz4780-nand.txt | 86 ++++++++++++++++++++++
1 file changed, 86 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt
diff --git a/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt b/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt
new file mode 100644
index 0000000..29ea585
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/ingenic,jz4780-nand.txt
@@ -0,0 +1,86 @@
+* Ingenic JZ4780 NAND/BCH
+
+This file documents the device tree bindings for NAND flash devices on the
+JZ4780. NAND devices are connected to the NEMC controller (described in
+memory-controllers/ingenic,jz4780-nemc.txt), and thus NAND device nodes must
+be children of the NEMC node.
+
+Required NAND controller device properties:
+- compatible: Should be set to "ingenic,jz4780-nand".
+- reg: For each bank with a NAND chip attached, should specify a bank number,
+ an offset of 0 and a size of 0x1000000 (i.e. the whole NEMC bank).
+
+Optional NAND controller device properties:
+- ingenic,bch-controller: To make use of the hardware BCH controller, this
+ property must contain a phandle for the BCH controller node. The required
+ properties for this node are described below. If this is not specified,
+ software BCH will be used instead.
+
+Optional children nodes:
+- Individual NAND chips are children of the NAND controller node.
+
+Required children node properties:
+- reg: An integer ranging from 1 to 6 representing the CS line to use.
+
+Optional children node properties:
+- nand-ecc-step-size: ECC block size in bytes.
+- nand-ecc-strength: ECC strength (max number of correctable bits).
+- nand-ecc-mode: String, operation mode of the NAND ecc mode. "hw" by default
+- nand-on-flash-bbt: boolean to enable on flash bbt option, if not present false
+- rb-gpios: GPIO specifier for the busy pin.
+- wp-gpios: GPIO specifier for the write protect pin.
+
+Optional child node of NAND chip nodes:
+- partitions: see Documentation/devicetree/bindings/mtd/partition.txt
+
+Example:
+
+nemc: nemc@13410000 {
+ ...
+
+ nandc: nand-controller@1 {
+ compatible = "ingenic,jz4780-nand";
+ reg = <1 0 0x1000000>; /* Bank 1 */
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ ingenic,bch-controller = <&bch>;
+
+ nand@1 {
+ reg = <1>;
+
+ nand-ecc-step-size = <1024>;
+ nand-ecc-strength = <24>;
+ nand-ecc-mode = "hw";
+ nand-on-flash-bbt;
+
+ rb-gpios = <&gpa 20 GPIO_ACTIVE_LOW>;
+ wp-gpios = <&gpf 22 GPIO_ACTIVE_LOW>;
+
+ partitions {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ...
+ }
+ };
+ };
+};
+
+The BCH controller is a separate SoC component used for error correction on
+NAND devices. The following is a description of the device properties for a
+BCH controller.
+
+Required BCH properties:
+- compatible: Should be set to "ingenic,jz4780-bch".
+- reg: Should specify the BCH controller registers location and length.
+- clocks: Clock for the BCH controller.
+
+Example:
+
+bch: bch@134d0000 {
+ compatible = "ingenic,jz4780-bch";
+ reg = <0x134d0000 0x10000>;
+
+ clocks = <&cgu JZ4780_CLK_BCH>;
+};
--
2.6.4
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| From | Brian Norris <computersforpeace@gmail.com> |
|---|---|
| Date | 2016-01-07 02:30 +0100 |
| Message-ID | <qO7yN-Q9-11@gated-at.bofh.it> |
| In reply to | #1300718 |
On Mon, Jan 04, 2016 at 12:34:42PM +0000, Harvey Hunt wrote:
> From: Alex Smith <alex.smith@imgtec.com>
>
> Add DT bindings for NAND devices connected to the NEMC on JZ4780 SoCs,
> as well as the hardware BCH controller, used by the jz4780_{nand,bch}
> drivers.
>
> Signed-off-by: Alex Smith <alex.smith@imgtec.com>
> Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
> Cc: David Woodhouse <dwmw2@infradead.org>
> Cc: Brian Norris <computersforpeace@gmail.com>
> Cc: linux-mtd@lists.infradead.org
> Cc: devicetree@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: robh@kernel.org
> Signed-off-by: Harvey Hunt <harvey.hunt@imgtec.com>
> Acked-by: Rob Herring <robh@kernel.org>
> Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
> v10 -> v11:
> - Added Boris Brezillon's Reviewed-By.
Applied just patch 1 for now. I had some small comments on patch 2. And
you need to send patch 3 to linux-mips and the MIPS maintainer.
Brian
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