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spi/pxa2xx-pci: Add common clock framework support in PCI glue layer 

SPI PXA2XX core layer has dependency on common clock framework
to obtain information on host supported clock rate. Thus, we
setup the clock device in the PCI glue layer to enable PCI mode
host pass in the clock rate information.

Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com>
Acked-by: Kweh, Hock Leong <hock.leong.kweh@intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Chew, Chiau Ee 2014-07-25 01:10:54 +08:00 committed by Mark Brown
parent 7d1311b93e
commit afa93c9017
2 changed files with 21 additions and 2 deletions
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2
drivers/spi/Kconfig
View File

@ -380,7 +380,7 @@ config SPI_PXA2XX
additional documentation can be found a Documentation/spi/pxa2xx.
config SPI_PXA2XX_PCI
def_tristate SPI_PXA2XX && PCI
def_tristate SPI_PXA2XX && PCI && COMMON_CLK
config SPI_ROCKCHIP
tristate "Rockchip SPI controller driver"

21
drivers/spi/spi-pxa2xx-pci.c
View File

@ -7,6 +7,8 @@
#include <linux/of_device.h>
#include <linux/module.h>
#include <linux/spi/pxa2xx_spi.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
enum {
PORT_CE4100,
@ -21,6 +23,7 @@ struct pxa_spi_info {
int tx_chan_id;
int rx_slave_id;
int rx_chan_id;
unsigned long max_clk_rate;
};
static struct pxa_spi_info spi_info_configs[] = {
@ -32,6 +35,7 @@ static struct pxa_spi_info spi_info_configs[] = {
.tx_chan_id = -1,
.rx_slave_id = -1,
.rx_chan_id = -1,
.max_clk_rate = 3686400,
},
[PORT_BYT] = {
.type = LPSS_SSP,
@ -41,6 +45,7 @@ static struct pxa_spi_info spi_info_configs[] = {
.tx_chan_id = 0,
.rx_slave_id = 1,
.rx_chan_id = 1,
.max_clk_rate = 50000000,
},
};
@ -53,6 +58,7 @@ static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
struct pxa2xx_spi_master spi_pdata;
struct ssp_device *ssp;
struct pxa_spi_info *c;
char buf[40];
ret = pcim_enable_device(dev);
if (ret)
@ -84,6 +90,12 @@ static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
ssp->type = c->type;
snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL,
CLK_IS_ROOT, c->max_clk_rate);
if (IS_ERR(ssp->clk))
return PTR_ERR(ssp->clk);
memset(&pi, 0, sizeof(pi));
pi.parent = &dev->dev;
pi.name = "pxa2xx-spi";
@ -92,8 +104,10 @@ static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
pi.size_data = sizeof(spi_pdata);
pdev = platform_device_register_full(&pi);
if (IS_ERR(pdev))
if (IS_ERR(pdev)) {
clk_unregister(ssp->clk);
return PTR_ERR(pdev);
}
pci_set_drvdata(dev, pdev);
@ -103,8 +117,13 @@ static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
{
struct platform_device *pdev = pci_get_drvdata(dev);
struct pxa2xx_spi_master *spi_pdata;
spi_pdata = dev_get_platdata(&pdev->dev);
platform_device_unregister(pdev);
clk_unregister(spi_pdata->ssp.clk);
pci_set_drvdata(dev, NULL);
}
static const struct pci_device_id pxa2xx_spi_pci_devices[] = {