Frank Li 2f552fa280 i3c: master: Extend address status bit to 4 and add I3C_ADDR_SLOT_EXT_DESIRED ... Extend the address status bit to 4 and introduce the I3C_ADDR_SLOT_EXT_DESIRED macro to indicate that a device prefers a specific address. This is generally set by the 'assigned-address' in the device tree source (dts) file. ┌────┬─────────────┬───┬─────────┬───┐ │S/Sr│ 7'h7E RnW=0 │ACK│ ENTDAA │ T ├────┐ └────┴─────────────┴───┴─────────┴───┘ │ ┌─────────────────────────────────────────┘ │ ┌──┬─────────────┬───┬─────────────────┬────────────────┬───┬─────────┐ └─►│Sr│7'h7E RnW=1 │ACK│48bit UID BCR DCR│Assign 7bit Addr│PAR│ ACK/NACK│ └──┴─────────────┴───┴─────────────────┴────────────────┴───┴─────────┘ Some master controllers (such as HCI) need to prepare the entire above transaction before sending it out to the I3C bus. This means that a 7-bit dynamic address needs to be allocated before knowing the target device's UID information. However, some I3C targets may request specific addresses (called as "init_dyn_addr"), which is typically specified by the DT-'s assigned-address property. Lower addresses having higher IBI priority. If it is available, i3c_bus_get_free_addr() preferably return a free address that is not in the list of desired addresses (called as "init_dyn_addr"). This allows the device with the "init_dyn_addr" to switch to its "init_dyn_addr" when it hot-joins the I3C bus. Otherwise, if the "init_dyn_addr" is already in use by another I3C device, the target device will not be able to switch to its desired address. If the previous step fails, fallback returning one of the remaining unassigned address, regardless of its state in the desired list. Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com> Signed-off-by: Frank Li <Frank.Li@nxp.com> Link: https://lore.kernel.org/r/20241021-i3c_dts_assign-v8-2-4098b8bde01e@nxp.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>		2024-10-31 23:51:00 +01:00
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master	i3c: master: svc: Fix use after free vulnerability in svc_i3c_master Driver Due to Race Condition	2024-09-17 16:51:45 +02:00
device.c	i3c: Add comment for -EAGAIN in i3c_device_do_priv_xfers()	2024-05-23 00:29:19 +02:00
internals.h	i3c: master: Enhance i3c_bus_type visibility for device searching & event monitoring	2024-07-26 14:21:30 +02:00
Kconfig	i3c: Add core I3C infrastructure	2018-11-12 10:33:49 +01:00
Makefile	i3c: Add core I3C infrastructure	2018-11-12 10:33:49 +01:00
master.c	i3c: master: Extend address status bit to 4 and add I3C_ADDR_SLOT_EXT_DESIRED	2024-10-31 23:51:00 +01:00