Re: [PATCH 1/3] pinctrl: mcp23s08: Fixup mcp23x17 regmap_config

On Fri, Aug 14, 2020 at 1:35 PM Thomas Preston
[off-list ref] wrote:

- Fix a typo where mcp23x17 configs are referred to as mcp23x16.

I'm not sure it's correct. MPC23016 is an existing I²C IO expander.

- Fix precious range to include INTCAP{A,B}, which clear on read.
- Fix precious range to include GPIOB, which clears on read.
- Fix volatile range to include GPIOB, to fix debugfs registers
  reporting different values than `gpioget gpiochip2 {0..15}`.

I'm wondering if you read all the datasheets before doing these changes.
MPC2308
MPC23016
MPC23017
...

-static const struct regmap_range mcp23x16_volatile_range = {
+static const struct regmap_range mcp23x17_volatile_range = {
        .range_min = MCP_INTF << 1,
-       .range_max = MCP_GPIO << 1,
+       .range_max = (MCP_GPIO << 1) + 1,

This looks weird. Usually we do a mask or a bit based mask, like (1 << x) - 1.

 };

...

+static const struct regmap_range mcp23x17_precious_range = {
+       .range_min = MCP_INTCAP << 1,
+       .range_max = (MCP_GPIO << 1) + 1,

Ditto.

 };

-- 
With Best Regards,
Andy Shevchenko