diff options
| author | Qiang Yu <quic_qianyu@quicinc.com> | 2024-04-24 11:21:54 +0800 |
|---|---|---|
| committer | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2024-04-25 20:16:43 +0530 |
| commit | 553f94fc7667259e47a9318e9e5702c9a814d637 (patch) | |
| tree | 6fa740a8658626f227a45de742ad6256ba43ac92 /include/linux/mhi.h | |
| parent | 17553ba8e19dee8770b3dcc597d49dcc3418f3b0 (diff) | |
bus: mhi: host: Add a new API for getting channel doorbell offset
Some controllers may want to access a specific doorbell register. Hence add
a new API that reads the CHDBOFF register and returns the offset of the
doorbell registers from MMIO base, so that the controller can calculate the
address of the specific doorbell register by adding the register offset
with doorbell offset and MMIO base address.
Signed-off-by: Qiang Yu <quic_qianyu@quicinc.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Link: https://lore.kernel.org/r/1713928915-18229-3-git-send-email-quic_qianyu@quicinc.com
[mani: reworded commit message and Kdoc]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Diffstat (limited to 'include/linux/mhi.h')
| -rw-r--r-- | include/linux/mhi.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/mhi.h b/include/linux/mhi.h index d968e1ab44dc..b573f15762f8 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -816,4 +816,13 @@ int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir, */ bool mhi_queue_is_full(struct mhi_device *mhi_dev, enum dma_data_direction dir); +/** + * mhi_get_channel_doorbell_offset - Get the channel doorbell offset + * @mhi_cntrl: MHI controller + * @chdb_offset: Read channel doorbell offset + * + * Return: 0 if the read succeeds, a negative error code otherwise + */ +int mhi_get_channel_doorbell_offset(struct mhi_controller *mhi_cntrl, u32 *chdb_offset); + #endif /* _MHI_H_ */ |