topic mx8m based board pinmux configuration in i.MX Processors

mx8m based board pinmux configuration

girishprasadgm — Sun, 26 Apr 2020 08:23:43 GMT

#imx8m mini pin mux configuration

Hi All,

I am newbee to pinmux tool, while exploring the pinmux configuration for iMX8M mini got the below questions, please help me in understanding

Exported the pin-mux details for iMX8M mini in pin mux tool and detsils for i2c is as below

In fsl-imx8mm-evk.dts file IO mux values are different

My question is why values(0x000001c3) generated by pinmux tool is not used directly? and there is addition of 0x40000000

and how the usdhc clk iomux values are generated for different frequency modes

Please help me out in understanding the above...

Thanks

Girish

Re: mx8m based board pinmux configuration

igorpadykov — Mon, 27 Apr 2020 08:44:44 GMT

Hi Girish

i2c 0x40000000 is sion bit described in sect.8.2.3.3 SW Loopback through SION bit

i.MX 8M Mini Applications Processor Reference Manual

dts sion (0x40000000 ) is described in

fsl,imx-pinctrl.txt\pinctrl\bindings\devicetree\Documentation - linux-imx - i.MX Linux kernel

usdhc clk and its other signals iomux values are generated for different frequency modes

based on specific board layouts, one can use also ibis modelling for finding best value

for dse for different frequencies, they are described for example in

sect.8.2.5.204 Pad Control Register (IOMUXC_SW_PAD_CTL_PAD_SD2_CMD)

Best regards
igor
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Re: mx8m based board pinmux configuration

girishprasadgm — Sun, 03 May 2020 14:58:12 GMT

Hi Igor,

Thanks a lot for your inputs..

Thanks

Girish