mtd: nand: denali_dt: enable HW_ECC_FIXUP for Altera SOCFPGA variant

There are various customizable parameters, so several variants for
this IP.  A generic compatible like "denali,denali-nand-dt" is
useless.  Moreover, there are multiple things wrong with this string.
(Refer to Rob's comment [1])

The "denali,denali-nand-dt" was added by Altera for the SOCFPGA port.
Replace it with a more specific string "altr,socfpga-denali-nand".
There are no users (in upstream) of the old compatible string.

The Denali IP on SOCFPGA incorporates the hardware ECC fixup engine.
So, this capability should be associated with the compatible.

[1] https://lkml.org/lkml/2016/12/1/450Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

Documentation/devicetree/bindings/mtd/denali-nand.txt

 * Denali NAND controller
 
 Required properties:
-  - compatible : should be "denali,denali-nand-dt"
+  - compatible : should be one of the following:
+      "altr,socfpga-denali-nand"            - for Altera SOCFPGA
   - reg : should contain registers location and length for data and reg.
   - reg-names: Should contain the reg names "nand_data" and "denali_reg"
   - interrupts : The interrupt number.
@@ -15,7 +16,7 @@ Examples:
 nand: nand@ff900000 {
 	#address-cells = <1>;
 	#size-cells = <1>;
-	compatible = "denali,denali-nand-dt";
+	compatible = "altr,socfpga-denali-nand";
 	reg = <0xff900000 0x100000>, <0xffb80000 0x10000>;
 	reg-names = "nand_data", "denali_reg";
 	interrupts = <0 144 4>;

drivers/mtd/nand/denali_dt.c

@@ -33,11 +33,17 @@ struct denali_dt_data {
 	unsigned int caps;
 };
 
+static const struct denali_dt_data denali_socfpga_data = {
+	.caps = DENALI_CAP_HW_ECC_FIXUP,
+};
+
 static const struct of_device_id denali_nand_dt_ids[] = {
-		{ .compatible = "denali,denali-nand-dt" },
+	{
+		.compatible = "altr,socfpga-denali-nand",
+		.data = &denali_socfpga_data,
+	},
 	{ /* sentinel */ }
-	};
-
+};
 MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
 
 static u64 denali_dma_mask;