V3.2.0 cp7420 init drop #1
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Adds support for the CP7420 battery charging IC in the sensor subsystem. Signed-off-by: Ricardo Rivera-Matos <[email protected]>
Documents the CP7420 battery charger dt bindings Signed-off-by: Ricardo Rivera-Matos <[email protected]>
Adds sample application for the CP7420 battery charging IC. Signed-off-by: Ricardo Rivera-Matos <[email protected]>
rriveramcrus
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Dec 14, 2022
This patch reworks how fragments are handled in the net_buf infrastructure. In particular, it removes the union around the node and frags members in the main net_buf structure. This is done so that both can be used at the same time, at a cost of 4 bytes per net_buf instance. This implies that the layout of net_buf instances changes whenever being inserted into a queue (fifo or lifo) or a linked list (slist). Until now, this is what happened when enqueueing a net_buf with frags in a queue or linked list: 1.1 Before enqueueing: +--------+ +--------+ +--------+ |#1 node|\ |#2 node|\ |zephyrproject-rtos#3 node|\ | | \ | | \ | | \ | frags |------| frags |------| frags |------NULL +--------+ +--------+ +--------+ net_buf #1 has 2 fragments, net_bufs #2 and zephyrproject-rtos#3. Both the node and frags pointers (they are the same, since they are unioned) point to the next fragment. 1.2 After enqueueing: +--------+ +--------+ +--------+ +--------+ +--------+ |q/slist |------|#1 node|------|#2 node|------|zephyrproject-rtos#3 node|------|q/slist | |node | | *flag | / | *flag | / | | / |node | | | | frags |/ | frags |/ | frags |/ | | +--------+ +--------+ +--------+ +--------+ +--------+ When enqueing a net_buf (in this case #1) that contains fragments, the current net_buf implementation actually enqueues all the fragments (in this case #2 and zephyrproject-rtos#3) as actual queue/slist items, since node and frags are one and the same in memory. This makes the enqueuing operation expensive and it makes it impossible to atomically dequeue. The `*flag` notation here means that the `flags` member has been set to `NET_BUF_FRAGS` in order to be able to reconstruct the frags pointers when dequeuing. After this patch, the layout changes considerably: 2.1 Before enqueueing: +--------+ +--------+ +--------+ |#1 node|--NULL |#2 node|--NULL |zephyrproject-rtos#3 node|--NULL | | | | | | | frags |-------| frags |-------| frags |------NULL +--------+ +--------+ +--------+ This is very similar to 1.1, except that now node and frags are different pointers, so node is just set to NULL. 2.2 After enqueueing: +--------+ +--------+ +--------+ |q/slist |-------|#1 node|-------|q/slist | |node | | | |node | | | | frags | | | +--------+ +--------+ +--------+ | +--------+ +--------+ | |#2 node|--NULL |zephyrproject-rtos#3 node|--NULL | | | | | +------------| frags |-------| frags |------NULL +--------+ +--------+ When enqueuing net_buf #1, now we only enqueue that very item, instead of enqueing the frags as well, since now node and frags are separate pointers. This simplifies the operation and makes it atomic. Resolves zephyrproject-rtos#52718. Signed-off-by: Carles Cufi <[email protected]>
rriveramcrus
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Jan 18, 2024
Previously the sample was using some headers that aren't
available to the host, now we can add a `Makefile.host` to
compile the example on a POSIX OS like Linux:
```
# Go to the sample dir
cd ${ZEPHYR_BASE}/samples/posix/uname
# Compile the sample
make -f Makefile.host
# Run the binary
./build/uname
sysname[65]: Linux
nodename[65]: LAPTOP-YC
release[65]: 5.10.16.3-microsoft-standard-WSL2
version[65]: #1 SMP Fri Apr 2 22:23:49 UTC 2021
machine[65]: x86_64
```
Signed-off-by: Yong Cong Sin <[email protected]>
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This is a pull request for the initial draft of the CP7420 battery charging IC driver in the sensor subsystem.