From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
In some configurations, mainly ACPI-based, the clock frequency of the
device is supplied by very well established 'clock-frequency'
property. Hence, try to get it from the property at last if no other
providers are available.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
---
v3: - only read clock-frequency property if no clk is found
- add error handling to device_property_read_u32()
v2: new patch
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
index 47c3f408a799..c8f8bdfc1bfb 100644
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
@@ -2883,11 +2883,19 @@ static int mcp251xfd_probe(struct spi_device *spi)
return dev_err_probe(&spi->dev, PTR_ERR(reg_xceiver),
"Failed to get Transceiver regulator!\n");
- clk = devm_clk_get(&spi->dev, NULL);
+ clk = devm_clk_get_optional(&spi->dev, NULL);
if (IS_ERR(clk))
return dev_err_probe(&spi->dev, PTR_ERR(clk),
"Failed to get Oscillator (clock)!\n");
- freq = clk_get_rate(clk);
+ if (clk) {
+ freq = clk_get_rate(clk);
+ } else {
+ err = device_property_read_u32(&spi->dev, "clock-frequency",
+ &freq);
+ if (err)
+ return dev_err_probe(&spi->dev, err,
+ "Failed to get clock-frequency!\n");
+ }
/* Sanity check */
if (freq < MCP251XFD_SYSCLOCK_HZ_MIN ||
--
2.30.2
