Hi, My third approach for a USB power sequence which fixes usb3503+lan on Odroid U3 board if it was initialized by bootloader (e.g. for TFTP boot). Changes since v2 ================ 1. Add Javier's reviewed-by tags. Address some comments. 2. Re-use existing properties for GPIOs etc by pwrseq-simple driver. New property is still added: "power-sequence". I tried to address and do according to Rob's comments. Please look at patch 6/12 ("power: pwrseq: simple: Add support for regulator and generic property") for bindings and the new code around matching "power-sequence" property. 3. I marked the usb code as "EXAMPLE" because that part is left to Peter Chen. Problem ======= When Odroid U3 (usb3503 + smsc95xx + max77686) boots from network (TFTP), the usb3503 and LAN smsc95xx do not show up in "lsusb". Hard-reset is required, e.g. by suspend to RAM. The actual TFTP boot does not have to happen. Just "usb start" from U-Boot is sufficient. >From the schematics, the regulator is a supply only to LAN, however without toggling it off/on, the usb3503 hub won appear neither. Solution ======== This is very similar to the MMC pwrseq behavior so the idea is to: 1. Move MMC pwrseq drivers to generic place, 2. Extend the pwrseq-simple with regulator toggling, 3. Add support to USB hub and port core for pwrseq, 4. Toggle the regulator when needed. Best regards, Krzysztof Krzysztof Kozlowski (12): power/mmc: Move pwrseq drivers to power/pwrseq MAINTAINERS: Retain Ulf Hansson as the same maintainer of pwrseq power: pwrseq: Enable COMPILE_TEST for drivers power: pwrseq: Remove mmc prefix from mmc_pwrseq power: pwrseq: Generalize mmc_pwrseq operations by removing mmc prefix power: pwrseq: simple: Add support for regulator and generic property power: pwrseq: Add support for USB hubs with external power usb: hub: Handle deferred probe EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree EXAMPLE CODE: usb: hub: Power sequence the ports on activation ARM: dts: exynos: Switch the buck8 to GPIO mode on Odroid U3 ARM: dts: exynos: Fix LAN and HUB after bootloader initialization on Odroid U3 .../pwrseq/pwrseq-emmc.txt} | 0 .../pwrseq/pwrseq-simple.txt} | 29 +++- MAINTAINERS | 9 ++ arch/arm/boot/dts/exynos4412-odroidu3.dts | 5 + drivers/mmc/Kconfig | 2 - drivers/mmc/core/Makefile | 3 - drivers/mmc/core/core.c | 8 +- drivers/mmc/core/host.c | 2 +- drivers/mmc/core/pwrseq.c | 110 --------------- drivers/mmc/core/pwrseq.h | 52 ------- drivers/power/Kconfig | 1 + drivers/power/Makefile | 1 + drivers/{mmc/core => power/pwrseq}/Kconfig | 22 ++- drivers/power/pwrseq/Makefile | 3 + drivers/power/pwrseq/pwrseq.c | 153 +++++++++++++++++++++ drivers/{mmc/core => power/pwrseq}/pwrseq_emmc.c | 17 +-- drivers/{mmc/core => power/pwrseq}/pwrseq_simple.c | 110 ++++++++++++--- drivers/usb/core/hub.c | 16 ++- drivers/usb/core/hub.h | 3 + drivers/usb/core/port.c | 15 ++ include/linux/mmc/host.h | 4 +- include/linux/pwrseq.h | 63 +++++++++ 22 files changed, 414 insertions(+), 214 deletions(-) rename Documentation/devicetree/bindings/{mmc/mmc-pwrseq-emmc.txt => power/pwrseq/pwrseq-emmc.txt} (100%) rename Documentation/devicetree/bindings/{mmc/mmc-pwrseq-simple.txt => power/pwrseq/pwrseq-simple.txt} (53%) delete mode 100644 drivers/mmc/core/pwrseq.c delete mode 100644 drivers/mmc/core/pwrseq.h rename drivers/{mmc/core => power/pwrseq}/Kconfig (60%) create mode 100644 drivers/power/pwrseq/Makefile create mode 100644 drivers/power/pwrseq/pwrseq.c rename drivers/{mmc/core => power/pwrseq}/pwrseq_emmc.c (88%) rename drivers/{mmc/core => power/pwrseq}/pwrseq_simple.c (52%) create mode 100644 include/linux/pwrseq.h -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html