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- add the pwrseq core framework - add the first power sequencing driver: pwrseq-qcom-wcn - add power control (pwrctl) changes to PCI core - add the first PCI pwrctl power sequencing driver -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEFp3rbAvDxGAT0sefEacuoBRx13IFAmaQ72wACgkQEacuoBRx 13K4fg//Qd8vxOH06/VSJRCwEvilUfYgDe/WiqTcBXL+8cK/3B0fUhfD83wgMnJn /yw2GgS5OjAvYe47nvM4T5M/XMpQ967XTED9cXxJWpBwcee+LZ6hsBGlPuSRunpo DQ4EuDh8wQ4j8Gw5pXj7dgtCN7zx4Idj+amh9i2ep+/7ZqT9UFqe294Tq9pX0X+a rhOrTooQo4uiwpSAh6k1db3o1VpVDhlx+m2CCQV6V5F3r7eiPv2tQE2B8GvlJlY/ KjGECsbxKMch6dtKQumRnn3R07v1b3SlQOQOSP99blNv8dfDBOKS0dFPI4se2n2b FvKCtmfC9QD9MPvTFKGSIZTTLMInfGpniLyxMD3Ubu+l26AA7eLpv4BICExFo71c 5gM/Xm8ypsrW7WadhAsl0mNS1CpbFZ2jNTBtuBrP5AFTMOvPqmYbN0VjRgYbX0Yw qXyu540iP8t8c0eTqRyrabhXFEehTso5cJGqtKvIARuoK1rF+wOPxTBU+RHjJWg/ xp7ckCGP+VymcD1xNGpHPweHxwu0z2RMI4zYg2i6WOjWz6FY/V2x1Pf3PGlXF7pq yaTMqK5tiGizCF2/RNFGDFQ8re0qtZfh6/mNtT45GGbUBaYltPGQFdFhsaI6rwEi LMO7M387u0fPJlS0/ib8I+S5ZfKo65xjC/jQSuUL8WfQf85Ck9k= =rI5g -----END PGP SIGNATURE----- Merge tag 'pwrseq-updates-for-v6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux Pull power sequencing updates from Bartosz Golaszewski: "This has been in development since last year's Linux Plumbers Conference and was inspired by the need to enable support upstream for Bluetooth/WLAN chips on Qualcomm platforms. The main problem we're fixing is powering up devices which are represented as separate objects in the kernel (binding to different drivers) but which share parts of the power-up sequence and thus need some kind of a mediator who knows the possible interactions and can assure they don't interfere with neither device's bring up. An example of such an inter-driver interaction is the WCN family of BT/WLAN chips from Qualcomm of which some models require the user to observe a certain delay between driving the bt-enable and wlan-enable GPIOs. This is not a new problem but up to this point all attempts at addressing it ended up hitting one wall or another and being dropped. The main obstacle was the fact that most these attempts tried to introduce the concept of a "power sequence" into the device-tree bindings which breaks the main DT rule: describe the hardware, not its behavior. The solution I proposed focuses on making the power sequencer drivers interpret the actual HW description flexibly. More details on that are in the linked cover letter. The second problem fixed here is powering up PCI devices before they are detected on the bus. This is achieved by creating special platform devices for device-tree nodes describing hard-wired PCI devices which bind to the so-called PCI power control drivers which enable required resources and trigger a bus rescan once the controlled device is up then setup the correct devlink hierarchy for power-management. By combining the two new frameworks we implemented the power sequencing PCI power control driver which is capable of powering up the WLAN modules of the QCom WCN family of chipsets. All this has spent a significant amount of time in linux-next and enabled WLAN/BT support on several Qualcomm platforms. To further prove that this is useful and needed: right after this was picked up into next, I was sent a series using the subsystem for a similar use-case on Amlogic platforms. This contains the core power sequencing framework, the first driver, PCI changes using the pwrseq library (blessed by Bjorn Helgaas) and some fixes that came later" * tag 'pwrseq-updates-for-v6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux: PCI/pwrctl: only call of_platform_populate() if CONFIG_OF is enabled power: sequencing: simplify returning pointer without cleanup PCI/pwrctl: Add a PCI power control driver for power sequenced devices PCI/pwrctl: Add PCI power control core code PCI/pwrctl: Create platform devices for child OF nodes of the port node PCI/pwrctl: Reuse the OF node for power controlled devices PCI: Hold the rescan mutex when scanning for the first time power: pwrseq: add a driver for the PMU module on the QCom WCN chipsets power: sequencing: implement the pwrseq core |
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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 reStructuredText 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.