Does the kernel 4.1.5 or 4.4 supports I2C with DMA on iMX6ul?

[bba]

Hello,

does the kernel supprts I2C with DMA support. If yes, how we have to modify the DTS?

Thanks,

Birger

[fabio_estevam]

The i2c driver supports DMA since kernel 3.19 and it has been tested on other platforms such as Vybrid/Layerscape.

It would not be too difficult to add DMA support on i.MX. You need to add 'dmas' and 'dma-names' (take a look at the uart ports as reference) in the imx6ul.dtsi and also make sure to configure IOMUXC_GPR_GPR0 to select DMA for the I2C port you are interested to. Please note that on imx6ul the DMA can be configured to I2C/SPI, so you need to configure it properly in IOMUXC_GPR_GPR0.

[bba]

Thanks Fabio,

I will try it later.

[Carlos_Musich]

Hi Birger,

unfortunately I2C is not supported with DMA en Kernel 4.1. And NXP does not have an official release of Kernel 4.4.

Sorry for the inconvenience.

Regards,
Carlos

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[bba]

Hi Carlos,

thanks for reply. Do you have any idea, if it is supported by the latest mainline kernel 4.9?

Regards,

Birger