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authorAntony Pavlov <antonynpavlov@gmail.com>2014-06-24 01:21:12 +0400
committerSascha Hauer <s.hauer@pengutronix.de>2014-06-25 08:34:52 +0200
commit51cc4239207a9cb48dc7f6b660f82cb50fd9c0db (patch)
tree2661a49f3f21b816d835c25f216bff5c28fdd7c1 /arch/mips
parent3ad9434f2faed97331670de1f5a6317df8c493b5 (diff)
downloadbarebox-51cc4239207a9cb48dc7f6b660f82cb50fd9c0db.tar.gz
barebox-51cc4239207a9cb48dc7f6b660f82cb50fd9c0db.tar.xz
MIPS: dts: qemu-malta.dts: use i2c-gpio for accessing CBUS FPGA I2C bus
Also we can enable m24c02 eeprom chip in dts-file e.g. &i2c0 { status = "okay"; eeprom: m24c02@50 { compatible = "spd"; reg = <0x50>; }; }; Alas! qemu mips malta spd m24c02 eeprom chip emulation is not perfect: the block read operation does not work properly. Here is an example. If we read eeprom content byte-by-byte then there is no problem: barebox:/ for i in 0x08 0x09 0x0a 0x0b 0x0c 0x0d 0x0e 0x0f ; > do i2c_read -b 0 -a 0x50 -r $i -c 1 ; done 0x01 0x75 0x54 0x00 0x82 0x08 0x00 0x01 Compare this output with content of qemu.git/hw/mips/mips_malta.c: static eeprom24c0x_t spd_eeprom = { .contents = { ... /* 00000008: */ 0x01,0x75,0x54,0x00,0x82,0x08,0x00,0x01, But if we read several bytes at once the we have data corruption: barebox:/ i2c_read -b 0 -a 0x50 -r 0x8 -c 8 0x01 0xff 0xff 0xff 0xff 0xff 0xff 0xff Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/dts/qemu-malta.dts16
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/mips/dts/qemu-malta.dts b/arch/mips/dts/qemu-malta.dts
index 204007d42f..cc1c9609ef 100644
--- a/arch/mips/dts/qemu-malta.dts
+++ b/arch/mips/dts/qemu-malta.dts
@@ -32,6 +32,18 @@
#gpio-cells = <2>;
};
+ i2c0: i2c0 {
+ compatible = "i2c-gpio";
+ gpios = <&gpio 0 0 /* sda */
+ &gpio 1 0 /* scl */
+ >;
+ i2c-gpio,sda-open-drain;
+ i2c-gpio,scl-open-drain;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ status = "disabled";
+ };
+
uart2: serial@bf000900 {
compatible = "ns16550a";
reg = <0xbf000900 0x40>;
@@ -58,3 +70,7 @@
};
};
};
+
+&i2c0 {
+ status = "okay";
+};