Add KSZ8081 support.

[rtrbt]

This adds support for the KSZ8081 ethernet phy.
Only the IDF 4+ specific code is modified, as the phy support was only
added recently:
espressif/esp-idf@aecfbf96

[me-no-dev]

Thanks :)

[brandonros]

CXX build/arduino/libraries/WiFi/src//ETH.o
/Users/brandonros/Desktop/esp-idf-v4.3/examples/get-started/sample_project/components/arduino/libraries/WiFi/src/ETH.cpp: In member function 'bool ETHClass::begin(uint8_t, int, int, int, eth_phy_type_t)':
/Users/brandonros/Desktop/esp-idf-v4.3/examples/get-started/sample_project/components/arduino/libraries/WiFi/src/ETH.cpp:174:23: error: 'esp_eth_phy_new_ksz8081' was not declared in this scope
             eth_phy = esp_eth_phy_new_ksz8081(&phy_config);
                       ^~~~~~~~~~~~~~~~~~~~~~~
/Users/brandonros/Desktop/esp-idf-v4.3/examples/get-started/sample_project/components/arduino/libraries/WiFi/src/ETH.cpp:174:23: note: suggested alternative: 'esp_eth_phy_new_ksz8041'
             eth_phy = esp_eth_phy_new_ksz8081(&phy_config);
                       ^~~~~~~~~~~~~~~~~~~~~~~
                       esp_eth_phy_new_ksz8041
make[1]: *** [libraries/WiFi/src//ETH.o] Error 1
make: *** [component-arduino-build] Error 2

I'm pretty sure this broke build against https://github.com/espressif/esp-idf.git release/v4.3

@rtrbt any recommendations?

Edit: I figured it out. git cherry-pick 98a4c70af94acdfb93baf48d7d25fe4d1560e4df against esp-idf

[jesse-schein]

Yea this PR broke esp-idf 4.3 that platformio uses

[rtrbt]

Building with pio works if you use the idf-master branch of the platform package like this:
platform = https://github.com/platformio/platform-espressif32.git#3b5de56
or
platform = https://github.com/platformio/platform-espressif32.git#idf-master

I could also add a version check to the ksz8081 specific code, so it is only compiled in if ESP-IDF 4.4 is available. But I'm not sure if this is a good idea, because a quick grep did not find any usage of IDF_MINOR or ESP_IDF_VERSION_MINOR (assuming this isn't the only occurence of code that does require a higher version than 4.0). @me-no-dev: Any thoughts?

[jesse-schein]

Building with pio works if you use the idf-master branch of the platform package like this:
platform = https://github.com/platformio/platform-espressif32.git#3b5de56
or
platform = https://github.com/platformio/platform-espressif32.git#idf-master

I could also add a version check to the ksz8081 specific code, so it is only compiled in if ESP-IDF 4.4 is available. But I'm not sure if this is a good idea, because a quick grep did not find any usage of IDF_MINOR or ESP_IDF_VERSION_MINOR (assuming this isn't the only occurence of code that does require a higher version than 4.0). @me-no-dev: Any thoughts?

Sounds to me like this is more of a platformio issue then. I was just mentioning it as a comment in case anyone else got stuck with the build errors and wanted some information on why the error was occuring if using platformio.

[LordRafa]

Building with pio works if you use the idf-master branch of the platform package like this:
platform = https://github.com/platformio/platform-espressif32.git#3b5de56
or
platform = https://github.com/platformio/platform-espressif32.git#idf-master
I could also add a version check to the ksz8081 specific code, so it is only compiled in if ESP-IDF 4.4 is available. But I'm not sure if this is a good idea, because a quick grep did not find any usage of IDF_MINOR or ESP_IDF_VERSION_MINOR (assuming this isn't the only occurence of code that does require a higher version than 4.0). @me-no-dev: Any thoughts?

Sounds to me like this is more of a platformio issue then. I was just mentioning it as a comment in case anyone else got stuck with the build errors and wanted some information on why the error was occuring if using platformio.

This PR also broke VSCode official plug-in and idf.py... if you go IDF official github, you can see that the function esp_eth_phy_new_ksz8081 is missing on the current stable branch 4.3 (so nothing to do with platformio IMHO).

Lets hope that 4.4 fix this in the mean time commenting out this PR modification does the trick, hopefully should be harmless unless you want to use the ksz8081 IC for Ethernet (which is not supported on 4.3 anyway)....

[rtrbt]

FYI: #5599

[LordRafa]

Cool anyway version 3.4.1 was just released with the function esp_eth_phy_new_ksz8081 in place