diff options
Diffstat (limited to 'kernel/drivers/spi/spi-img-spfi.c')
| -rw-r--r-- | kernel/drivers/spi/spi-img-spfi.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/drivers/spi/spi-img-spfi.c b/kernel/drivers/spi/spi-img-spfi.c index bb916c8d4..823cbc92d 100644 --- a/kernel/drivers/spi/spi-img-spfi.c +++ b/kernel/drivers/spi/spi-img-spfi.c @@ -581,6 +581,7 @@ static int img_spfi_probe(struct platform_device *pdev) struct img_spfi *spfi; struct resource *res; int ret; + u32 max_speed_hz; master = spi_alloc_master(&pdev->dev, sizeof(*spfi)); if (!master) @@ -645,6 +646,19 @@ static int img_spfi_probe(struct platform_device *pdev) master->max_speed_hz = clk_get_rate(spfi->spfi_clk) / 4; master->min_speed_hz = clk_get_rate(spfi->spfi_clk) / 512; + /* + * Maximum speed supported by spfi is limited to the lower value + * between 1/4 of the SPFI clock or to "spfi-max-frequency" + * defined in the device tree. + * If no value is defined in the device tree assume the maximum + * speed supported to be 1/4 of the SPFI clock. + */ + if (!of_property_read_u32(spfi->dev->of_node, "spfi-max-frequency", + &max_speed_hz)) { + if (master->max_speed_hz > max_speed_hz) + master->max_speed_hz = max_speed_hz; + } + master->setup = img_spfi_setup; master->cleanup = img_spfi_cleanup; master->transfer_one = img_spfi_transfer_one; |