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Re: [PATCH 20/21] hw/i2c: Import TCA6416 emulation from Xilinx
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From: |
Dmitriy Sharikhin |
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Subject: |
Re: [PATCH 20/21] hw/i2c: Import TCA6416 emulation from Xilinx |
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Date: |
Mon, 3 Feb 2025 05:42:55 +0000 |
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.
Best regards,
Dmitrii