Am 3. Februar 2025 05:42:55 UTC schrieb Dmitriy Sharikhin <d.sharik...@yadro.com>: >At Sun, 02/02/2025 at 18:09 +0100, Philippe Mathieu-Daudé writes: >> No clue about compatibility. If you unfortunately need to add it, >> then please address my comments in the next version. >TCA6416 is _way_ more complex device than PCF8574. Basically PCF8574 is >shift register directly connected to IO lines, while TCA6416 is more like >fully-fledged GPIO controller with output direction, drive strength, interrupt >mask configuration etc etc. > >In Linux kernel these devices are handled by family-compatible driver > drivers/gpio/gpio-pca953x.c >Closest things by implementation in QEMU source tree are > hw/gpio/pca9552.c and > hw/gpio/pca9554.c >However they are NOT register-compatible with pca953x. I suppose, best >decision would be new driver for TCA6416 which eventually should support whole >pca953x family of I2C GPIO expanders. Just for the record: There has been an attempt to implement it: <https://lore.kernel.org/qemu-devel/20241107195453.2684138-3-tit...@google.com/> > >Best regards, >Dmitrii
