From a59153dfebb065663fef64827e73aa771c683960 Mon Sep 17 00:00:00 2001 From: Vabhav Sharma Date: Wed, 9 Dec 2020 10:42:03 +0530 Subject: [PATCH] dm: core: add function uclass_probe_all() to probe all devices Support a common method to probe all devices associated with uclass. This includes data structures and code for finding the first device and looping for remaining devices associated with uclasses (groups of devices with the same purpose, e.g. all SERIAL ports will be in the same uclass). An example is SBSA compliant PL011 UART IP, where firmware does the serial port initialization and prepare uart device to let the kernel use it for sending and reveiving the characters.SERIAL uclass will use this function to initialize PL011 UART ports. The feature is enabled with CONFIG_DM. Signed-off-by: Vabhav Sharma Reviewed-by: Stefan Roese Reviewed-by: Simon Glass Reviewed-by: Sean Anderson --- drivers/core/uclass.c | 19 +++++++++++++++++++ include/dm/uclass.h | 11 +++++++++++ 2 files changed, 30 insertions(+) diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c index cdb975d5b3..f38122d54b 100644 --- a/drivers/core/uclass.c +++ b/drivers/core/uclass.c @@ -757,6 +757,25 @@ int uclass_pre_remove_device(struct udevice *dev) } #endif +int uclass_probe_all(enum uclass_id id) +{ + struct udevice *dev; + int ret; + + ret = uclass_first_device(id, &dev); + if (ret || !dev) + return ret; + + /* Scanning uclass to probe all devices */ + while (dev) { + ret = uclass_next_device(&dev); + if (ret) + return ret; + } + + return 0; +} + UCLASS_DRIVER(nop) = { .id = UCLASS_NOP, .name = "nop", diff --git a/include/dm/uclass.h b/include/dm/uclass.h index b5f066dbf4..d95683740c 100644 --- a/include/dm/uclass.h +++ b/include/dm/uclass.h @@ -376,6 +376,17 @@ int uclass_next_device_check(struct udevice **devp); int uclass_first_device_drvdata(enum uclass_id id, ulong driver_data, struct udevice **devp); +/** + * uclass_probe_all() - Probe all devices based on an uclass ID + * + * This function probes all devices associated with a uclass by + * looking for its ID. + * + * @id: uclass ID to look up + * @return 0 if OK, other -ve on error + */ +int uclass_probe_all(enum uclass_id id); + /** * uclass_id_foreach_dev() - Helper function to iteration through devices *