Sorry for delay. This is RFC v3. (I forgot to send a pre-requisite patch.)
README.pinctrl is missing in this version (I will do it in the next version), but the code itself is almost ready for the review.
This series depends on "Add macros to ease our life with independent CONFIGs between U-Boot and SPL", consists of 15 patches.
Masahiro Yamada (4): dm: do not return pointer if NULL is given to devp of device_bind() pinctrl: add pin control uclass support pinctrl: add simple pinctrl implementation pinctrl: sandbox: add sandbox pinctrl driver
arch/sandbox/dts/sandbox.dts | 19 +++ configs/sandbox_defconfig | 5 + drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/core/device.c | 10 +- drivers/pinctrl/Kconfig | 53 ++++++ drivers/pinctrl/Makefile | 4 + drivers/pinctrl/pinctrl-generic.c | 351 ++++++++++++++++++++++++++++++++++++++ drivers/pinctrl/pinctrl-sandbox.c | 157 +++++++++++++++++ drivers/pinctrl/pinctrl-uclass.c | 180 +++++++++++++++++++ include/dm/pinctrl.h | 220 ++++++++++++++++++++++++ include/dm/uclass-id.h | 2 + 12 files changed, 1002 insertions(+), 2 deletions(-) create mode 100644 drivers/pinctrl/Kconfig create mode 100644 drivers/pinctrl/Makefile create mode 100644 drivers/pinctrl/pinctrl-generic.c create mode 100644 drivers/pinctrl/pinctrl-sandbox.c create mode 100644 drivers/pinctrl/pinctrl-uclass.c create mode 100644 include/dm/pinctrl.h