[RFC PATCH v1 1/2] include: fdtdec: decouple fdt_addr_t and phys_addr_t size

[Johan Jonker]

The DT specification supports CPUs with both 32-bit and 64-bit addressing
capabilities. In U-boot the fdt_addr_t and phys_addr_t size are coupled
by a typedef. The MTD NAND drivers for 32-bit CPU's can describe partitions
with a 64-bit reg property. These partitions synced from Linux end up with
the wrong offset and sizes when only the lower 32-bit is passed.
Decouple the fdt_addr_t and phys_addr_t size as they don't necessary
match.

Signed-off-by: Johan Jonker <jbx6244 at gmail.com>
---

Note for Tom Rini or others:

fdt_addr_t is referenced in 230 files and fdt_size_t in 50 files.
Most drivers mix up FDT and CPU capabilities.
Please advise how to move forward with proper DT parsing.

---

This is related to a possible future serie of bug fixes
for the Rockchip nfc driver.
---
 Kconfig          | 8 ++++++++
 include/fdtdec.h | 8 +++++---
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/Kconfig b/Kconfig
index a75cce7e..8101f1a6 100644
--- a/Kconfig
+++ b/Kconfig
@@ -422,11 +422,19 @@ endif # EXPERT

 config PHYS_64BIT
 	bool "64bit physical address support"
+	select FDT_64BIT
 	help
 	  Say Y here to support 64bit physical memory address.
 	  This can be used not only for 64bit SoCs, but also for
 	  large physical address extension on 32bit SoCs.

+config FDT_64BIT
+	bool "64bit fdt address support"
+	help
+	  Say Y here to support 64bit fdt memory address.
+	  This can be used not only for 64bit SoCs, but also for
+	  large physical address extension on 32bit SoCs.
+
 config HAS_ROM
 	bool
 	select BINMAN
diff --git a/include/fdtdec.h b/include/fdtdec.h
index 12355afd..0adde92a 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -21,12 +21,12 @@
  * A typedef for a physical address. Note that fdt data is always big
  * endian even on a litle endian machine.
  */
-typedef phys_addr_t fdt_addr_t;
-typedef phys_size_t fdt_size_t;

 #define FDT_SIZE_T_NONE (-1U)

-#ifdef CONFIG_PHYS_64BIT
+#ifdef CONFIG_FDT_64BIT
+typedef u64 fdt_addr_t;
+typedef u64 fdt_size_t;
 #define FDT_ADDR_T_NONE ((ulong)(-1))

 #define fdt_addr_to_cpu(reg) be64_to_cpu(reg)
@@ -35,6 +35,8 @@ typedef phys_size_t fdt_size_t;
 #define cpu_to_fdt_size(reg) cpu_to_be64(reg)
 typedef fdt64_t fdt_val_t;
 #else
+typedef u32 fdt_addr_t;
+typedef u32 fdt_size_t;
 #define FDT_ADDR_T_NONE (-1U)

 #define fdt_addr_to_cpu(reg) be32_to_cpu(reg)
--
2.20.1