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spi: core: allow reporting the effectivly used speed_hz for a transfer

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Provide a means for the spi bus driver to report the effectively used
spi clock frequency used for each spi_transfer.

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Martin Sperl 2019-02-23 08:49:49 +00:00 committed by Mark Brown
parent e727d4cbc7
commit 5d7e2b5ed5
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2 changed files with 6 additions and 0 deletions
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1
drivers/spi/spi.c
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@ -3126,6 +3126,7 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message)
*/
message->frame_length = 0;
list_for_each_entry(xfer, &message->transfers, transfer_list) {
xfer->effective_speed_hz = 0;
message->frame_length += xfer->len;
if (!xfer->bits_per_word)
xfer->bits_per_word = spi->bits_per_word;

5
include/linux/spi/spi.h
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@ -745,6 +745,9 @@ extern void spi_res_release(struct spi_controller *ctlr,
* (set by bits_per_word) transmission.
* @word_delay: clock cycles to inter word delay after each word size
* (set by bits_per_word) transmission.
* @effective_speed_hz: the effective SCK-speed that was used to
* transfer this transfer. Set to 0 if the spi bus driver does
* not support it.
* @transfer_list: transfers are sequenced through @spi_message.transfers
* @tx_sg: Scatterlist for transmit, currently not for client use
* @rx_sg: Scatterlist for receive, currently not for client use
@ -835,6 +838,8 @@ struct spi_transfer {
u32 speed_hz;
u16 word_delay;
u32 effective_speed_hz;
struct list_head transfer_list;
};