[U-Boot] [PATCH v3 5/5] malta: Use device model & tree for UART

[Paul Burton]

Make use of device model & device tree to probe the UART driver. This is
the initial step in bringing Malta up to date with driver model, and
allows for cleaner handling of the different I/O addresses for different
system controllers by specifying the ISA bus address instead of a
translated memory address.

Signed-off-by: Paul Burton <paul.burton at imgtec.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>
---

Changes in v3:
- Don't select CONFIG_OF_EMBED for Malta, but add it to defconfigs.
- Add @0 to isa node name to satisfy DTC master.
- Rebase atop u-boot-mips/next.

Changes in v2:
- Only handle the UART we already use, for simplicity.

 arch/mips/Kconfig           |  4 ++++
 arch/mips/dts/Makefile      |  1 +
 arch/mips/dts/mti,malta.dts | 32 ++++++++++++++++++++++++++++++++
 configs/malta_defconfig     |  2 ++
 configs/maltael_defconfig   |  2 ++
 include/configs/malta.h     |  6 ------
 6 files changed, 41 insertions(+), 6 deletions(-)
 create mode 100644 arch/mips/dts/mti,malta.dts

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index dc34c18..53363e3 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -23,7 +23,11 @@ config TARGET_QEMU_MIPS
 
 config TARGET_MALTA
 	bool "Support malta"
+	select DM
+	select DM_SERIAL
 	select DYNAMIC_IO_PORT_BASE
+	select OF_CONTROL
+	select OF_ISA_BUS
 	select SUPPORTS_BIG_ENDIAN
 	select SUPPORTS_LITTLE_ENDIAN
 	select SUPPORTS_CPU_MIPS32_R1
diff --git a/arch/mips/dts/Makefile b/arch/mips/dts/Makefile
index a94b745..2f04d73 100644
--- a/arch/mips/dts/Makefile
+++ b/arch/mips/dts/Makefile
@@ -4,6 +4,7 @@
 
 dtb-$(CONFIG_TARGET_AP121) += ap121.dtb
 dtb-$(CONFIG_TARGET_AP143) += ap143.dtb
+dtb-$(CONFIG_TARGET_MALTA) += mti,malta.dtb
 dtb-$(CONFIG_TARGET_PIC32MZDASK) += pic32mzda_sk.dtb
 dtb-$(CONFIG_BOARD_TPLINK_WDR4300) += tplink_wdr4300.dtb
 
diff --git a/arch/mips/dts/mti,malta.dts b/arch/mips/dts/mti,malta.dts
new file mode 100644
index 0000000..d339229
--- /dev/null
+++ b/arch/mips/dts/mti,malta.dts
@@ -0,0 +1,32 @@
+/dts-v1/;
+
+/memreserve/ 0x00000000 0x00001000;	/* Exception vectors */
+/memreserve/ 0x000f0000 0x00010000;	/* PIIX4 ISA memory */
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	compatible = "mti,malta";
+
+	chosen {
+		stdout-path = &uart0;
+	};
+
+	isa at 0 {
+		compatible = "isa";
+		#address-cells = <2>;
+		#size-cells = <1>;
+		ranges = <1 0 0 0x1000>;
+
+		uart0: serial at 3f8 {
+			compatible = "ns16550a";
+
+			reg = <1 0x3f8 0x40>;
+			reg-shift = <0>;
+
+			clock-frequency = <1843200>;
+
+			u-boot,dm-pre-reloc;
+		};
+	};
+};
diff --git a/configs/malta_defconfig b/configs/malta_defconfig
index a16f10b..3c3bb16 100644
--- a/configs/malta_defconfig
+++ b/configs/malta_defconfig
@@ -1,5 +1,6 @@
 CONFIG_MIPS=y
 CONFIG_TARGET_MALTA=y
+CONFIG_DEFAULT_DEVICE_TREE="mti,malta"
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="malta # "
 # CONFIG_CMD_LOADB is not set
@@ -9,5 +10,6 @@ CONFIG_SYS_PROMPT="malta # "
 CONFIG_CMD_DHCP=y
 # CONFIG_CMD_NFS is not set
 CONFIG_CMD_PING=y
+CONFIG_OF_EMBED=y
 CONFIG_SYS_NS16550=y
 CONFIG_USE_PRIVATE_LIBGCC=y
diff --git a/configs/maltael_defconfig b/configs/maltael_defconfig
index 5289797..b245d91 100644
--- a/configs/maltael_defconfig
+++ b/configs/maltael_defconfig
@@ -1,6 +1,7 @@
 CONFIG_MIPS=y
 CONFIG_TARGET_MALTA=y
 CONFIG_SYS_LITTLE_ENDIAN=y
+CONFIG_DEFAULT_DEVICE_TREE="mti,malta"
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="maltael # "
 # CONFIG_CMD_LOADB is not set
@@ -10,5 +11,6 @@ CONFIG_SYS_PROMPT="maltael # "
 CONFIG_CMD_DHCP=y
 # CONFIG_CMD_NFS is not set
 CONFIG_CMD_PING=y
+CONFIG_OF_EMBED=y
 CONFIG_SYS_NS16550=y
 CONFIG_USE_PRIVATE_LIBGCC=y
diff --git a/include/configs/malta.h b/include/configs/malta.h
index 1c3c83c..e03935b 100644
--- a/include/configs/malta.h
+++ b/include/configs/malta.h
@@ -65,13 +65,7 @@
  * Serial driver
  */
 #define CONFIG_BAUDRATE			115200
-
-#define CONFIG_SYS_NS16550_SERIAL
 #define CONFIG_SYS_NS16550_PORT_MAPPED
-#define CONFIG_SYS_NS16550_REG_SIZE	1
-#define CONFIG_SYS_NS16550_CLK		(115200 * 16)
-#define CONFIG_SYS_NS16550_COM1		0x3f8
-#define CONFIG_CONS_INDEX		1
 
 /*
  * Flash configuration
-- 
2.8.2