Hi boric,
Thanks for your quick reply.
On 9/7/2018 8:19 PM, Boris Brezillon wrote:
On Fri, 7 Sep 2018 18:57:10 +0800
Jianxin Pan <jianxin.pan@xxxxxxxxxxx> wrote:
From: Liang Yang <liang.yang@xxxxxxxxxxx>
Add Amlogic NAND controller dt-bindings for Meson SoC,
Current this driver support GXBB/GXL/AXG platform.
Signed-off-by: Liang Yang <liang.yang@xxxxxxxxxxx>
Signed-off-by: Yixun Lan <yixun.lan@xxxxxxxxxxx>
---
.../devicetree/bindings/mtd/amlogic,meson-nand.txt | 91 ++++++++++++++++++++++
1 file changed, 91 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt
diff --git a/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt
new file mode 100644
index 0000000..655a778
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt
@@ -0,0 +1,91 @@
+Amlogic NAND Flash Controller (NFC) for GXBB/GXL/AXG family SoCs
+
+This file documents the properties in addition to those available in
+the MTD NAND bindings.
+
+Required properties:
+- compatible : contains one of:
+ - "amlogic,meson-gxl-nfc"
+ - "amlogic,meson-axg-nfc"
+- clocks :
+ A list of phandle + clock-specifier pairs for the clocks listed
+ in clock-names.
+
+- clock-names: Should contain the following:
+ "core" - NFC module gate clock
+ "device" - device clock from eMMC sub clock controller
+
+- pins : Select pins which NFC need.
+- nand_pins: Detail NAND pins information.
You mean pinctrl-names and pinctrl-0, right? Not sure it's necessary to
document that, but if you do, please use the correct DT prop names.
I find no documentation for that in other xx_nand.txt; I will consider
to remove it.
+- amlogic,mmc-syscon : Required for NAND clocks, it's shared with SD/eMMC
+ controller port C
+
+Optional children nodes:
+Children nodes represent the available nand chips.
+
+
+
One too many blank lines here.
ok, i will remove it.
+Other properties:
+see Documentation/devicetree/bindings/mtd/nand.txt for generic bindings.
+
+Example demonstrate on AXG SoC:
+
+ sd_emmc_c_clkc: mmc@7000 {
+ compatible = "amlogic,meson-axg-mmc-clkc", "syscon";
+ reg = <0x0 0x7000 0x0 0x800>;
+ status = "okay";
+ };
+
+ nand: nfc@7800 {
+ compatible = "amlogic,meson-axg-nfc";
+ reg = <0x0 0x7800 0x0 0x100>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ interrupts = <GIC_SPI 34 IRQ_TYPE_EDGE_RISING>;
+ status = "disabled";
+
+ clocks = <&clkc CLKID_SD_EMMC_C>,
+ <&sd_emmc_c_clkc CLKID_MMC_DIV>;
+ clock-names = "core", "device";
+ amlogic,mmc-syscon = <&sd_emmc_c_clkc>;
+
+ status = "okay";
+
+ pinctrl-names = "default";
+ pinctrl-0 = <&nand_pins>;
+
+ nand@0 {
+ reg = <0>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ nand-on-flash-bbt;
+ nand-ecc-mode = "hw";
+ nand-ecc-strength = <8>;
+ nand-ecc-step-size = <1024>;
Drop nand-ecc- props. I guess you have a sensible default value and I
prefer when ECC requirements are directly extracted during chip
detection. Defining that in the DT is a bad habit. The only one that
could make sense (assuming you support it) is nand-ecc-maximize.
ok, i will drop them.
we adopt auto detection during init stage, it works too.
+
+ amlogic,nand-enable-scrambler;
Please drop this property (it's not longer documented).
em, we should have removed it when nfc driver never use it.
+
+ partition@0 {
+ label = "boot";
+ reg = <0x00000000 0x00200000>;
+ read-only;
+ };
+ partition@200000 {
+ label = "env";
+ reg = <0x00200000 0x00400000>;
+ };
+ partition@600000 {
+ label = "system";
+ reg = <0x00600000 0x00a00000>;
+ };
+ partition@1000000 {
+ label = "rootfs";
+ reg = <0x01000000 0x03000000>;
+ };
+ partition@4000000 {
+ label = "media";
+ reg = <0x04000000 0x8000000>;
+ };
No need to define the partitions in your example, especially since they
should be placed in a partitions subnode with a "fixed-partitions"
compat.
ok, i will remove it.
+ };
+ };
.
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