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NFC: NCI: allow spi driver to choose transfer clock

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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 <cuissard@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Vincent Cuissard 2015-10-26 10:27:43 +01:00 committed by Samuel Ortiz
parent fcd9d046fd
commit 2bd832459a
2 changed files with 12 additions and 1 deletions
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6
include/net/nfc/nci_core.h
View File

@ -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;

7
net/nfc/nci/spi.c
View File

@ -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);