RE: [PATCH v7 5/9] gpio: regmap: Add gpio_regmap_operation to extend reg_mask_xlate callback
Yu-Chun Lin [林祐君] <[email protected]>
| Newsgroups | org.kernel.vger.linux-gpio,org.kernel.vger.linux-iio,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
> Hi, > > On Thu Jul 23, 2026 at 1:14 PM CEST, Yu-Chun Lin [林祐君] wrote: >> Regarding the hardware, this controller indeed has dedicated and >> separate bits for IN, OUT, and DIR. If configured as an output, >> reading the IN bit does not reflect the actual state, so we must check >> the DIR bit first to know which bit to read. > > Just out of curiosity, the out bit is also the control bit which > will set the gpio line state, correct? IOW, you are reading just the > bit you've set before and there is no way to read the real line state. > > -michael In our current implementation, when configured as an output, we only read back the state we set. Best Regards, Yu-Chun