This driver is used to control the power state of the devices attached to
the PCI slots. Currently, it controls the voltage rails of the PCI slots
defined in the devicetree node of the root port.
The voltage rails for PCI slots are documented in the DT-schema:
https://github.com/devicetree-org/dt-schema/blob/v2024.11/dtschema/schemas/pci/pci-bus-common.yaml#L153
Since this driver has to work with different kind of slots (PCIe
x1/x4/x8/x16, Mini PCIe, PCI, etc.), the driver is thus using the
of_regulator_bulk_get_all() API to obtain the voltage regulators defined
in the DT node, instead of hardcoding them.
As such, the DT node of the root port should define the relevant supply
properties corresponding to the voltage rails of the PCI slot.
Tested-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20250116-pci-pwrctrl-slot-v3-5-827473c8fbf4@linaro.org
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
(cherry picked from commit 75996c92f4de309f855471927e6489f5a354cfd4)
Bug: 380139395
Change-Id: I26b93ff6503d52f3b87034d4dba82674332b88ab
Signed-off-by: Brian Norris <briannorris@google.com>
To slightly reduce confusion between "pwrctl" (the power controller and
power sequencing framework) and "bwctrl" (the bandwidth controller),
rename "pwrctl" to "pwrctrl" so they use the same "ctrl" suffix.
Rename drivers/pci/pwrctl/ to drivers/pci/pwrctrl/, including the related
MAINTAINERS, include file (include/linux/pci-pwrctl.h), Makefile, and
Kconfig changes.
This is the minimal rename of files only. A subsequent commit will rename
functions and data structures.
Link: https://lore.kernel.org/r/20241115214428.2061153-2-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Acked-by: Krzysztof Wilczyński <kw@linux.com>
(cherry picked from commit b88cbaaa6fa109c2eb455d8fe2a318de0d197ea2)
Bug: 380139395
Change-Id: Ic62bba7be5bf652b995dd42bba9893a97c94d2a1
Signed-off-by: Brian Norris <briannorris@google.com>
Manivannan Sadhasivam
Bjorn Helgaas