Commit 2bd83245 authored by Vincent Cuissard's avatar Vincent Cuissard Committed by Samuel Ortiz
Browse files

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: default avatarVincent Cuissard <cuissard@marvell.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent fcd9d046

include/net/nfc/nci_core.h

+6 −0
Original line number Diff line number Diff line
@@ -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;

net/nfc/nci/spi.c

+6 −1
Original line number Diff line number Diff line
@@ -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);

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