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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> |
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