Unverified Commit 5d7e2b5e authored by Martin Sperl's avatar Martin Sperl Committed by Mark Brown
Browse files

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



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

Signed-off-by: default avatarMartin Sperl <kernel@martin.sperl.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent e727d4cb

drivers/spi/spi.c

+1 −0
Original line number Diff line number Diff line
@@ -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;

include/linux/spi/spi.h

+5 −0
Original line number Diff line number Diff line
@@ -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;

};