2f95b9d5 - interconnect: Add generic interconnect driver for Exynos SoCs

Thu, 12 Nov 2020 14:09:28 +0000

interconnect: Add generic interconnect driver for Exynos SoCsThis patch adds a generic interconnect driver for Exynos SoCs in orderto provide interconnect functionality for each "samsung,exynos-bus"compatible device.The SoC topology is a graph (or more specifically, a tree) and itsedges are described by specifying in the 'interconnects' propertythe interconnect consumer path for each interconnect provider DT node.Each bus is now an interconnect provider and an interconnect node aswell (cf. Documentation/interconnect/interconnect.rst), i.e. every busregisters itself as a node. Node IDs are not hard coded but ratherassigned dynamically at runtime. This approach allows for using thisdriver with various Exynos SoCs.Frequencies requested via the interconnect API for a given node arepropagated to devfreq using dev_pm_qos_update_request(). Please notethat it is not an error when CONFIG_INTERCONNECT is 'n', in whichcase all interconnect API functions are no-op.The samsung,data-clk-ratio DT property is used to specify the ratioof the interconect bandwidth to the minimum data clock frequencyfor each bus.Due to unspecified relative probing order, -EPROBE_DEFER may bepropagated to ensure that the parent is probed before its children.Reviewed-by: Chanwoo Choi Tested-by: Chanwoo Choi Acked-by: Krzysztof Kozlowski Signed-off-by: Artur Świgoń Signed-off-by: Sylwester Nawrocki Link: https://lore.kernel.org/r/20201112140931.31139-3-s.nawrocki@samsung.comSigned-off-by: Georgi Djakov List of files: /linux-6.15/drivers/interconnect/samsung/Makefile

Changes in Makefile

2f95b9d5 - interconnect: Add generic interconnect driver for Exynos SoCs