[v2] dt-bindings: nand: denali: reduce the register space in the example

Message ID 1506059903-15552-1-git-send-email-yamada.masahiro@socionext.com
State Accepted
Commit e8901f3ab5b5c2ce75abdcd182b07d00fd6746fe
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Series
  • [v2] dt-bindings: nand: denali: reduce the register space in the example
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Commit Message

Masahiro Yamada Sept. 22, 2017, 5:58 a.m.
This example allocates much more than needed for address regions.

As for "denali_reg", as you see in drivers/mtd/nand/denali.h, all
registers fit in 0x1000.

As for "nand_data", this IP is generally configured to use Indexed
Addressing mode, where there are only two registers in the address
translation module (CTRL: 0x00, DATA: 0x10).  Altera SOCFPGA is
also this case.  So, 0x20 is enough.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

Acked-by: Rob Herring <robh@kernel.org>

---

Changes in v2:
  - Add a little more explanation for rationale of this patch

 Documentation/devicetree/bindings/mtd/denali-nand.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
2.7.4


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Patch

diff --git a/Documentation/devicetree/bindings/mtd/denali-nand.txt b/Documentation/devicetree/bindings/mtd/denali-nand.txt
index 504291d..0ee8edb 100644
--- a/Documentation/devicetree/bindings/mtd/denali-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/denali-nand.txt
@@ -29,7 +29,7 @@  nand: nand@ff900000 {
 	#address-cells = <1>;
 	#size-cells = <1>;
 	compatible = "altr,socfpga-denali-nand";
-	reg = <0xff900000 0x100000>, <0xffb80000 0x10000>;
+	reg = <0xff900000 0x20>, <0xffb80000 0x1000>;
 	reg-names = "nand_data", "denali_reg";
 	interrupts = <0 144 4>;
 };