Hi, Another version for solving a problem of power sequence on USB hubs and devices. Apparently I am not the only one experiencing it. The patchset tries to provide a framework for generic power sequence of USB devices but the USB part is left to Peter Chen. Patchset is also available here: repo: https://github.com/krzk/linux branch: for-next/odroid-u3-usb3503-lan-boot-fixes-v4 Changes since v3 ================ 1. Address Rob's comments. All regulator supplies are parsed and toggled during power sequence. This comes with two new patches: a. regulator, b. simplefb. 2. Minor fixes in pwrseq-simple driver - proper module removal path. 3. Minor fixes in example USB code (pointed out by Stephen Boyd). 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 (14): regulator: of: Add helper for getting all supplies simplefb: Use new devm_of_regulator_all_get helper and bulk API 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 regulators 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} | 30 ++- 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/mmc/core/pwrseq_simple.c | 141 ------------ 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/power/pwrseq/pwrseq_simple.c | 245 +++++++++++++++++++++ drivers/regulator/of_regulator.c | 86 ++++++++ drivers/usb/core/hub.c | 16 +- drivers/usb/core/hub.h | 3 + drivers/usb/core/port.c | 15 ++ drivers/video/fbdev/simplefb.c | 71 ++---- include/linux/mmc/host.h | 4 +- include/linux/pwrseq.h | 63 ++++++ include/linux/regulator/of_regulator.h | 13 ++ 26 files changed, 680 insertions(+), 395 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} (50%) delete mode 100644 drivers/mmc/core/pwrseq.c delete mode 100644 drivers/mmc/core/pwrseq.h delete mode 100644 drivers/mmc/core/pwrseq_simple.c 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%) create mode 100644 drivers/power/pwrseq/pwrseq_simple.c 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
