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Re: [PATCH 20/21] hw/i2c: Import TCA6416 emulation from Xilinx
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From: |
Bernhard Beschow |
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Subject: |
Re: [PATCH 20/21] hw/i2c: Import TCA6416 emulation from Xilinx |
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Date: |
Mon, 17 Feb 2025 18:06:01 +0000 |
Am 3. Februar 2025 05:42:55 UTC schrieb Dmitriy Sharikhin
<d.sharikhin@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-titusr@google.com/>
>
>Best regards,
>Dmitrii