On Wed, Feb 26, 2020 at 09:51:39AM +0800, Shengjiu Wang wrote:

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+static const struct regmap_config fsl_easrc_regmap_config = {
+     .readable_reg = fsl_easrc_readable_reg,
+     .volatile_reg = fsl_easrc_volatile_reg,
+     .writeable_reg = fsl_easrc_writeable_reg,

Can we use regmap_range and regmap_access_table?

Can the regmap_range support discontinuous registers?  The
reg_stride = 4.

I think it does. Giving an example here:
https://github.com/torvalds/linux/blob/master/drivers/mfd/da9063-i2c.c

The register in this i2c driver are continuous,  from 0x00, 0x01, 0x02...

But our case is 0x00, 0x04, 0x08, does it work?

Ah...I see your point now. I am not very sure -- have only used
in I2C drivers. You can ignore if it doesn't likely work for us.