The SION pin must be set for proper operation of I2C when DM is enabled.
When legacy I2C is used, this bit is set implicitly in the u-boot code:
arch/arm/include/asm/arch-mx5/iomux-mx53.h:92:
MX53_PAD_KEY_ROW3__I2C2_SDA = IOMUX_PAD(0x368, 0x040, 4 |
IOMUX_CONFIG_SION, 0x820, 0, NO_PAD_CTRL),
The Linux kernel uses similar approach with:
arch/arm/boot/dts/imx53-tqma53.dtsi:182:
MX53_PAD_KEY_ROW3__I2C2_SDA 0xc0000000
After applying this patch it is possible to have the I2C working with DM
on imx53 devices:
MX53_PAD_KEY_ROW3__I2C2_SDA (0x1ee | IMX_PAD_SION)
Signed-off-by: Lukasz Majewski <lukma@denx.de>
Add CX9020 board based on mx53loco.
Add simplified imx53 base device tree from kernel v4.8-rc8, to reuse
serial_mxc with DTE and prepare for device tree migration of other
functions and imx53 devices.
The CX9020 differs from i.MX53 Quick Start Board by:
- use uart2 instead of uart1
- DVI-D connector instead of VGA
- no audio
- CCAT FPGA connected to emi
- enable rtc
Signed-off-by: Patrick Bruenn <p.bruenn@beckhoff.com>
Lukasz Majewski
Patrick Bruenn