The system reset controller (SRC) on i.MX51, i.MX53, and i.MX6q controls reset lines to the GPU, VPU, IPU, and OpenVG IP modules.
The following patches add a simple API for devices to request being reset by separate reset controller hardware and implements the reset signal device tree binding proposed by Stephen Warren. Contrary to Tegra hardware, the i.MX SRC contains self-deasserting reset registers, so I've included both ops to manually assert/deassert a reset line, as well as a "reset" operation that is supposed to assert the reset line and wait for it to deassert. The i.MX SRC is enhanced to provide a reset controller and the IPU driver is made to request being reset by calling the device_reset(&pdev->dev) convenience wrapper during probing. Changes since v4: - removed flags parameter from .of_xlate / of_reset_simple_xlate - warn also if reset_spec->args_count > rcdev->of_reset_n_cells - unlock list mutex only after try_module_get - tighten devm_reset_control_match a bit regards Philipp --- .../devicetree/bindings/reset/fsl,imx-src.txt | 49 ++++ .../devicetree/bindings/reset/gpio-reset.txt | 37 +++ Documentation/devicetree/bindings/reset/reset.txt | 75 ++++++ .../bindings/staging/imx-drm/fsl-imx-drm.txt | 3 + arch/arm/boot/dts/imx51.dtsi | 7 + arch/arm/boot/dts/imx53.dtsi | 7 + arch/arm/boot/dts/imx6q.dtsi | 1 + arch/arm/boot/dts/imx6qdl.dtsi | 4 +- arch/arm/mach-imx/Kconfig | 3 + arch/arm/mach-imx/mm-imx5.c | 2 + arch/arm/mach-imx/src.c | 69 ++++- drivers/Kconfig | 2 + drivers/Makefile | 3 + drivers/reset/Kconfig | 26 ++ drivers/reset/Makefile | 2 + drivers/reset/core.c | 297 +++++++++++++++++++++ drivers/reset/gpio-reset.c | 208 +++++++++++++++ drivers/staging/imx-drm/ipu-v3/ipu-common.c | 12 +- include/linux/reset-controller.h | 51 ++++ include/linux/reset.h | 17 ++ 20 files changed, 870 insertions(+), 5 deletions(-) _______________________________________________ devicetree-discuss mailing list devicetree-discuss@lists.ozlabs.org https://lists.ozlabs.org/listinfo/devicetree-discuss
