From 2bd832459a0827b8dcf13b345380b66f92089d74 Mon Sep 17 00:00:00 2001 From: Vincent Cuissard Date: Mon, 26 Oct 2015 10:27:43 +0100 Subject: [PATCH] NFC: NCI: allow spi driver to choose transfer clock In some cases low level drivers might want to update the SPI transfer clock (e.g. during firmware download). This patch adds this support. Without any modification the driver will use the default SPI clock (from pdata or device tree). Signed-off-by: Vincent Cuissard Signed-off-by: Samuel Ortiz --- include/net/nfc/nci_core.h | 6 ++++++ net/nfc/nci/spi.c | 7 ++++++- 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/include/net/nfc/nci_core.h b/include/net/nfc/nci_core.h index 77880bdf93a8..5a1572a34c49 100644 --- a/include/net/nfc/nci_core.h +++ b/include/net/nfc/nci_core.h @@ -394,6 +394,12 @@ struct nci_spi { unsigned int xfer_udelay; /* microseconds delay between transactions */ + + unsigned int xfer_speed_hz; /* + * SPI clock frequency + * 0 => default clock + */ + u8 acknowledge_mode; struct completion req_completion; diff --git a/net/nfc/nci/spi.c b/net/nfc/nci/spi.c index 25153d0e33cf..d904cd2f1442 100644 --- a/net/nfc/nci/spi.c +++ b/net/nfc/nci/spi.c @@ -58,6 +58,7 @@ static int __nci_spi_send(struct nci_spi *nspi, struct sk_buff *skb, } t.cs_change = cs_change; t.delay_usecs = nspi->xfer_udelay; + t.speed_hz = nspi->xfer_speed_hz; spi_message_init(&m); spi_message_add_tail(&t, &m); @@ -144,7 +145,8 @@ struct nci_spi *nci_spi_allocate_spi(struct spi_device *spi, nspi->acknowledge_mode = acknowledge_mode; nspi->xfer_udelay = delay; - + /* Use controller max SPI speed by default */ + nspi->xfer_speed_hz = 0; nspi->spi = spi; nspi->ndev = ndev; init_completion(&nspi->req_completion); @@ -197,12 +199,14 @@ static struct sk_buff *__nci_spi_read(struct nci_spi *nspi) tx.tx_buf = req; tx.len = 2; tx.cs_change = 0; + tx.speed_hz = nspi->xfer_speed_hz; spi_message_add_tail(&tx, &m); memset(&rx, 0, sizeof(struct spi_transfer)); rx.rx_buf = resp_hdr; rx.len = 2; rx.cs_change = 1; + rx.speed_hz = nspi->xfer_speed_hz; spi_message_add_tail(&rx, &m); ret = spi_sync(nspi->spi, &m); @@ -226,6 +230,7 @@ static struct sk_buff *__nci_spi_read(struct nci_spi *nspi) rx.len = rx_len; rx.cs_change = 0; rx.delay_usecs = nspi->xfer_udelay; + rx.speed_hz = nspi->xfer_speed_hz; spi_message_add_tail(&rx, &m); ret = spi_sync(nspi->spi, &m); -- 2.39.5