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. They implement the reset signal device tree binding proposed by Stephen Warren. Contrary to Tegra hardware, the i.MX SRC has self-deasserting reset bits, 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. 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 | 3 + arch/arm/mach-imx/Kconfig | 1 + arch/arm/mach-imx/common.h | 3 +- arch/arm/mach-imx/mach-imx6q.c | 2 +- arch/arm/mach-imx/mm-imx5.c | 2 + arch/arm/mach-imx/src.c | 86 ++++++- drivers/Kconfig | 2 + drivers/Makefile | 2 + drivers/reset/Kconfig | 10 + drivers/reset/Makefile | 2 + drivers/reset/core.c | 241 ++++++++++++++++++++ drivers/staging/imx-drm/ipu-v3/ipu-common.c | 12 +- include/linux/imx-src.h | 6 + 18 files changed, 507 insertions(+), 6 deletions(-) _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
