How to set imx6solo gpio_8 as xtalosc_ref_clk_32k ?

[chia]

Do anyone know how to set gpio_8 as xtalosc_ref_clk_32 ?

Does only iomux need to setup ??

[gusarambula]

Hello lan yi-chia,

You may configure the mux mode of the GPIO08 pin on the IOMUXC_SW_MUX_CTL_PAD_GPIO08[MUX_MODE] bits. For details please check section 37.4.139 of the i.MX6S Reference Manual which covers the IOMUXC_SW_MUX_CTL_PAD_GPIO08 register.

[chia]

Hello gusarmbula,

Yes, i do config IOMUXC_SW_MUX_CTL_PAD_GPIO08[MUX_MODE] bits as XTALOSC_REF_CLK_32K. After set done, I can read register valu as 0x1.

But there is no clock output.

[chia]

After set GPIO_8 mux as 32k clock, then i read register get value as below:

1. IOMUXC_SW_MUX_CTL_PAD_GPIO08 (0x20e023c) = 0x1
2. IOMUXC_SW_PAD_CTL_PAD_GPIO08 (0x20e060c) = 0x1 

I have tried to modify IOMUXC_SW_PAD_CTL_PAD_GPIO08 as 0x1e05d at kernel run time (not set this register by device tree), then 32K clock output success.

Now my question is ,  where to set IOMUXC_SW_PAD_CTL_PAD_GPIO08 register value ????

[chia]

issue resolved. I got wrong device tree file.