diff options
author | Philip Richard Oberfichtner <pro@denx.de> | 2023-10-31 08:38:46 +0100 |
---|---|---|
committer | Heiko Schocher <hs@denx.de> | 2023-10-31 09:08:51 +0100 |
commit | b48355277340f156f387c31da5a0b8937643c54f (patch) | |
tree | 593065b5e85ade9b428efe5bfdbe85a69772b37c | |
parent | 31f4ee4b13d974ba4b973211eeb57db70bc5ea77 (diff) | |
download | u-boot-b48355277340f156f387c31da5a0b8937643c54f.zip u-boot-b48355277340f156f387c31da5a0b8937643c54f.tar.gz u-boot-b48355277340f156f387c31da5a0b8937643c54f.tar.bz2 |
i2c: Implement i2c_get_chip_by_phandle()
This new function enhances the i2c_get_chip*() toolbox by implementing a
variant that does not require a chip_addr. Instead, the desired device
is pointed to by a phandle.
Signed-off-by: Philip Richard Oberfichtner <pro@denx.de>
Reviewed-by: Heiko Schocher <hs@denx.de>
-rw-r--r-- | drivers/i2c/i2c-uclass.c | 75 | ||||
-rw-r--r-- | include/i2c.h | 12 |
2 files changed, 87 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-uclass.c b/drivers/i2c/i2c-uclass.c index 8867a56..5405067 100644 --- a/drivers/i2c/i2c-uclass.c +++ b/drivers/i2c/i2c-uclass.c @@ -388,6 +388,81 @@ int i2c_get_chip_for_busnum(int busnum, int chip_addr, uint offset_len, return 0; } +/* Find and probe I2C bus based on a chip attached to it */ +static int i2c_get_parent_bus(ofnode chip, struct udevice **devp) +{ + ofnode node; + struct udevice *dev; + int ret; + + node = ofnode_get_parent(chip); + if (!ofnode_valid(node)) + return -ENODEV; + + ret = uclass_get_device_by_ofnode(UCLASS_I2C, node, &dev); + if (ret) { + *devp = NULL; + return ret; + } + + *devp = dev; + return 0; +} + +int i2c_get_chip_by_phandle(const struct udevice *parent, const char *prop_name, + struct udevice **devp) +{ + ofnode node; + uint phandle; + struct udevice *bus, *chip; + char *dev_name; + int ret; + + debug("%s: Searching I2C chip for phandle \"%s\"\n", + __func__, prop_name); + + dev_name = strdup(prop_name); + if (!dev_name) { + ret = -ENOMEM; + goto err_exit; + } + + ret = dev_read_u32(parent, "i2cbcdev", &phandle); + if (ret) + goto err_exit; + + node = ofnode_get_by_phandle(phandle); + if (!ofnode_valid(node)) { + ret = -ENODEV; + goto err_exit; + } + + ret = i2c_get_parent_bus(node, &bus); + if (ret) + goto err_exit; + + ret = device_bind_driver_to_node(bus, "i2c_generic_chip_drv", + dev_name, node, &chip); + if (ret) + goto err_exit; + + ret = device_probe(chip); + if (ret) { + device_unbind(chip); + goto err_exit; + } + + debug("%s succeeded\n", __func__); + *devp = chip; + return 0; + +err_exit: + free(dev_name); + debug("%s failed, ret = %d\n", __func__, ret); + *devp = NULL; + return ret; +} + int dm_i2c_probe(struct udevice *bus, uint chip_addr, uint chip_flags, struct udevice **devp) { diff --git a/include/i2c.h b/include/i2c.h index ef3820e..4e59009 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -538,6 +538,18 @@ int i2c_get_chip_for_busnum(int busnum, int chip_addr, uint offset_len, struct udevice **devp); /** + * i2c_get_chip_by_phandle() - get a device to use to access a chip + * based on a phandle property pointing to it + * + * @parent: Parent device containing the phandle pointer + * @name: Name of phandle property in the parent device node + * @devp: Returns pointer to new device or NULL if not found + * Return: 0 on success, -ve on failure + */ +int i2c_get_chip_by_phandle(const struct udevice *parent, const char *prop_name, + struct udevice **devp); + +/** * i2c_chip_of_to_plat() - Decode standard I2C platform data * * This decodes the chip address from a device tree node and puts it into |