topic Operating points in imx6*.dtsi files in i.MX Processors

Operating points in imx6*.dtsi files

adrianmcgrath — Wed, 02 Mar 2016 16:34:00 GMT

Good afternoon all

I've just been looking through the imx6*.dtsi files in the arch/arm/boot/dts directory of kernel 3.14.28 and have noticed a few differences between the operating points that are stated. I've tabulated them for ease and highlighted the differences in red.

	DSTI file – Voltage operating points (uV)
Speed (Khz)	imx6q.dtsi	imx6dl.dtsi	imx6sl.dtsi	imx6sx.dtsi
1200000	1275000
996000	1250000	1275000	1275000	1250000
852000	1250000
792000	1175000	1175000	1175000	1175000
396000	975000	1150000	975000	1075000
198000				975000

	DSTI file – Voltage fsl,soc-operating points (uV)
Speed (Khz)	imx6q.dtsi	imx6dl.dtsi	imx6sl.dtsi	imx6sx.dtsi
1200000	1275000
996000	1250000	1175000	1225000	1175000
852000	1250000
792000	1175000	1175000	1175000	1175000
396000	1175000	1175000	1175000	1175000
198000				1175000

Questions:

1) Please could "someone in the know" comment on the variation of the operating point voltages?

2) Also, please could someone confirm the maximum safe value to enter for these operating point values?

Many thanks

Re: Operating points in imx6*.dtsi files

igorpadykov — Thu, 03 Mar 2016 04:01:30 GMT

Hi Adrian

operating points are described in datasheets

Table 6. Operating Ranges i.MX6DQ Datasheet (rev.4, 7/2015)

http://cache.freescale.com/files/32bit/doc/data_sheet/IMX6DQCEC.pdf

Table 8. Operating Ranges i.MX6SDL Datasheet (rev.5, 6/2015)

http://cache.freescale.com/files/32bit/doc/data_sheet/IMX6SDLCEC.pdf

Table 11. Operating ranges i.MX6SX Datasheet (rev.1, 9/2015)

http://cache.freescale.com/files/32bit/doc/data_sheet/IMX6SXCEC.pdf

Best regards

igor

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Re: Operating points in imx6*.dtsi files

adrianmcgrath — Thu, 03 Mar 2016 08:11:58 GMT

Thanks Igor, I'll be sure to keep the values below 1.3V

Are you able to comment on the variation of the values used in the dtsi files?