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| author |   Linus Walleij <linus.walleij@linaro.org> | 2020-03-27 22:36:17 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2020-03-27 22:36:17 +0100 |
| commit | 06dd3f31cb70035cbd3f507c11fd50e3089aeb81 (patch) | |
| tree | 98065919df104fba32191f2464f4193a998cd6a1 /Documentation/driver-api | |
| parent | tools: gpio: Fix out-of-tree build regression (diff) | |
| parent | Linux 5.6-rc7 (diff) | |
| download | wireguard-linux-06dd3f31cb70035cbd3f507c11fd50e3089aeb81.tar.xz wireguard-linux-06dd3f31cb70035cbd3f507c11fd50e3089aeb81.zip | |
Merge tag 'v5.6-rc7' into devel
Linux 5.6-rc7
Diffstat (limited to 'Documentation/driver-api')
| -rw-r--r-- | Documentation/driver-api/dmaengine/client.rst | 14 | ||||
| -rw-r--r-- | Documentation/driver-api/ipmb.rst | 4 |
2 files changed, 14 insertions, 4 deletions
diff --git a/Documentation/driver-api/dmaengine/client.rst b/Documentation/driver-api/dmaengine/client.rst index e5953e7e4bf4..2104830a99ae 100644 --- a/Documentation/driver-api/dmaengine/client.rst +++ b/Documentation/driver-api/dmaengine/client.rst @@ -151,8 +151,8 @@ The details of these operations are: Note that callbacks will always be invoked from the DMA engines tasklet, never from interrupt context. -Optional: per descriptor metadata ---------------------------------- + **Optional: per descriptor metadata** + DMAengine provides two ways for metadata support. DESC_METADATA_CLIENT @@ -199,12 +199,15 @@ Optional: per descriptor metadata DESC_METADATA_CLIENT - DMA_MEM_TO_DEV / DEV_MEM_TO_MEM: + 1. prepare the descriptor (dmaengine_prep_*) construct the metadata in the client's buffer 2. use dmaengine_desc_attach_metadata() to attach the buffer to the descriptor 3. submit the transfer + - DMA_DEV_TO_MEM: + 1. prepare the descriptor (dmaengine_prep_*) 2. use dmaengine_desc_attach_metadata() to attach the buffer to the descriptor @@ -215,6 +218,7 @@ Optional: per descriptor metadata DESC_METADATA_ENGINE - DMA_MEM_TO_DEV / DEV_MEM_TO_MEM: + 1. prepare the descriptor (dmaengine_prep_*) 2. use dmaengine_desc_get_metadata_ptr() to get the pointer to the engine's metadata area @@ -222,7 +226,9 @@ Optional: per descriptor metadata 4. use dmaengine_desc_set_metadata_len() to tell the DMA engine the amount of data the client has placed into the metadata buffer 5. submit the transfer + - DMA_DEV_TO_MEM: + 1. prepare the descriptor (dmaengine_prep_*) 2. submit the transfer 3. on transfer completion, use dmaengine_desc_get_metadata_ptr() to get @@ -278,8 +284,8 @@ Optional: per descriptor metadata void dma_async_issue_pending(struct dma_chan *chan); -Further APIs: -------------- +Further APIs +------------ 1. Terminate APIs diff --git a/Documentation/driver-api/ipmb.rst b/Documentation/driver-api/ipmb.rst index 3ec3baed84c4..209c49e05116 100644 --- a/Documentation/driver-api/ipmb.rst +++ b/Documentation/driver-api/ipmb.rst @@ -71,9 +71,13 @@ b) Example for device tree:: ipmb@10 { compatible = "ipmb-dev"; reg = <0x10>; + i2c-protocol; }; }; +If xmit of data to be done using raw i2c block vs smbus +then "i2c-protocol" needs to be defined as above. + 2) Manually from Linux:: modprobe ipmb-dev-int |