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| Filename | Latest commit message | Latest commit date |
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3e4a856af3The AP6212 is based on the Broadcom BCM43430 or BCM43438. The WiFi side identifies as BCM43430, while the Bluetooth side identifies as BCM43438. The Bluetooth side is connected to UART3 in a 4 wire configuration. Same as the WiFi side, due to being the same chip and package, DLDO1 and DLDO2 regulator outputs from the PMIC provide overall power via VBAT and I/O power via VDDIO. The CLK_OUT_A clock output from the SoC provides the LPO low power clock at 32.768 kHz. This patch enables Bluetooth on this board, and also adds the missing LPO clock on the WiFi side. There is also a PCM connection for Bluetooth, but this is not covered here. The LPO clock is fed from CLK_OUT_A, which needs to be muxed on pin PI12. This can be represented in multiple ways. This patch puts the pinctrl property in the pin controller node. This is due to limitations in Linux, where pinmux settings, even the same one, can not be shared by multiple devices. Thus we cannot put it in both the WiFi and Bluetooth device nodes. Putting it the CCU node is another option, but Linux's CCU driver does not handle pinctrl. Also the pin controller is guaranteed to be initialized after the CCU, when clocks are available. And any other devices that use muxed pins are guaranteed to be initialized after the pin controller. Thus having the CLK_OUT_A pinmux reference be in the pin controller node is a good choice without having to deal with implementation issues. Signed-off-by: Pablo Greco <pgreco@centosproject.org> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.