From 5d7e2b5ed5858fe739d4cb8ad22dcce7bd9dbe7b Mon Sep 17 00:00:00 2001 From: Martin Sperl Date: Sat, 23 Feb 2019 08:49:49 +0000 Subject: [PATCH] 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: Martin Sperl Signed-off-by: Mark Brown --- drivers/spi/spi.c | 1 + include/linux/spi/spi.h | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index cfa3c3decb8a..e9bf0c23da50 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -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; diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index f55b20254612..d0c5ba746e01 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -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; }; -- 2.39.5