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 v1: - Fixed issues from comments - Added reset controller driver for GPIO controlled resets regards Philipp --- .../devicetree/bindings/reset/fsl,imx-src.txt | 49 ++++ 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 | 5 +- arch/arm/mach-imx/Kconfig | 2 + arch/arm/mach-imx/mm-imx5.c | 2 + arch/arm/mach-imx/src.c | 58 ++++- drivers/Kconfig | 2 + drivers/Makefile | 3 + drivers/reset/Kconfig | 22 ++ drivers/reset/Makefile | 2 + drivers/reset/core.c | 238 ++++++++++++++++++++ drivers/reset/gpio-reset.c | 188 ++++++++++++++++ drivers/staging/imx-drm/ipu-v3/ipu-common.c | 12 +- include/linux/reset-controller.h | 39 ++++ include/linux/reset.h | 17 ++ 18 files changed, 726 insertions(+), 5 deletions(-) _______________________________________________ devicetree-discuss mailing list devicetree-discuss@lists.ozlabs.org https://lists.ozlabs.org/listinfo/devicetree-discuss