diff options
Diffstat (limited to 'drivers/spi/spi-bcm63xx-hsspi.c')
| -rw-r--r-- | drivers/spi/spi-bcm63xx-hsspi.c | 35 |
1 files changed, 30 insertions, 5 deletions
diff --git a/drivers/spi/spi-bcm63xx-hsspi.c b/drivers/spi/spi-bcm63xx-hsspi.c index 55789f7cda92..5514cd02e93a 100644 --- a/drivers/spi/spi-bcm63xx-hsspi.c +++ b/drivers/spi/spi-bcm63xx-hsspi.c @@ -19,6 +19,7 @@ #include <linux/interrupt.h> #include <linux/spi/spi.h> #include <linux/mutex.h> +#include <linux/of.h> #define HSSPI_GLOBAL_CTRL_REG 0x0 #define GLOBAL_CTRL_CS_POLARITY_SHIFT 0 @@ -91,6 +92,7 @@ #define HSSPI_MAX_SYNC_CLOCK 30000000 +#define HSSPI_SPI_MAX_CS 8 #define HSSPI_BUS_NUM 1 /* 0 is legacy SPI */ struct bcm63xx_hsspi { @@ -332,7 +334,7 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct clk *clk; int irq, ret; - u32 reg, rate; + u32 reg, rate, num_cs = HSSPI_SPI_MAX_CS; irq = platform_get_irq(pdev, 0); if (irq < 0) { @@ -351,8 +353,16 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev) return PTR_ERR(clk); rate = clk_get_rate(clk); - if (!rate) - return -EINVAL; + if (!rate) { + struct clk *pll_clk = devm_clk_get(dev, "pll"); + + if (IS_ERR(pll_clk)) + return PTR_ERR(pll_clk); + + rate = clk_get_rate(pll_clk); + if (!rate) + return -EINVAL; + } ret = clk_prepare_enable(clk); if (ret) @@ -374,8 +384,17 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev) mutex_init(&bs->bus_mutex); init_completion(&bs->done); - master->bus_num = HSSPI_BUS_NUM; - master->num_chipselect = 8; + master->dev.of_node = dev->of_node; + if (!dev->of_node) + master->bus_num = HSSPI_BUS_NUM; + + of_property_read_u32(dev->of_node, "num-cs", &num_cs); + if (num_cs > 8) { + dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n", + num_cs); + num_cs = HSSPI_SPI_MAX_CS; + } + master->num_chipselect = num_cs; master->setup = bcm63xx_hsspi_setup; master->transfer_one_message = bcm63xx_hsspi_transfer_one; master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | @@ -461,10 +480,16 @@ static int bcm63xx_hsspi_resume(struct device *dev) static SIMPLE_DEV_PM_OPS(bcm63xx_hsspi_pm_ops, bcm63xx_hsspi_suspend, bcm63xx_hsspi_resume); +static const struct of_device_id bcm63xx_hsspi_of_match[] = { + { .compatible = "brcm,bcm6328-hsspi", }, + { }, +}; + static struct platform_driver bcm63xx_hsspi_driver = { .driver = { .name = "bcm63xx-hsspi", .pm = &bcm63xx_hsspi_pm_ops, + .of_match_table = bcm63xx_hsspi_of_match, }, .probe = bcm63xx_hsspi_probe, .remove = bcm63xx_hsspi_remove, |