Microchip's USB224x family of Hi-Speed USB 2.0 flash media card controllers provide an ultra-fast interface between a USB host controller and flash media cards. This patch adds a GPIO based usb-sd reset for USB2244 USB2 ultra fast SD controller. This usb2244 driver trigger sd reset signal after soft reset or core Reset. The SD needs to be resetted after completion of phy initialization. After the toggling of gpio, controller gets out form reset. As part of the reset, sets the direction of the pin to output before toggling the pin. Delay of microseconds is added in between low and high to meet the setup and hold time requirement of the reset. --- Changes for V2: - Update reset polarity, make reset ACTIVE LOW in the dt-binding document and usb2244 driver. - Fix WARNING: msleep < 20ms can sleep for up to 20ms by changing msleep to usleep_range() - Addressed Rob Herring review comments - Added usbsd node under the usb controller (usb0) node. - Remove Warning: decoded text below may be mangled, UTF-8 assumed. Review comments: Link: https://lore.kernel.org/lkml/20211024180628.2992108-3-piyush.mehta@xxxxxxxxxx/t/#m2e146078276051984a144ba074c6cf4eee07b4d0 --- Piyush Mehta (2): dt-bindings: usb: misc: Add binding for Microchip usb2244 Controller usb: misc: usb244: add support for USB2 ultra fast sd controller .../devicetree/bindings/usb/microchip,usb2244.yaml | 47 +++++++++++++++ drivers/usb/misc/Kconfig | 10 ++++ drivers/usb/misc/Makefile | 1 + drivers/usb/misc/usb2244.c | 69 ++++++++++++++++++++++ 4 files changed, 127 insertions(+) create mode 100644 Documentation/devicetree/bindings/usb/microchip,usb2244.yaml create mode 100644 drivers/usb/misc/usb2244.c -- 2.7.4
