phy: phy-can-transceiver: Skip warning if no "max-bitrate"

[ Upstream commit bc30c15f275484f9b9fe27c2fa0895f3022d9943 ]

According to the DT bindings, the "max-bitrate" property is optional.
However, when it is not present, a warning is printed.
Fix this by adding a missing check for -EINVAL.

Fixes: a4a86d273ff1b6f7 ("phy: phy-can-transceiver: Add support for generic CAN transceiver driver")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/88e158f97dd52ebaa7126cd9631f34764b9c0795.1674037334.git.geert+renesas@glider.be
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/phy/phy-can-transceiver.c b/drivers/phy/phy-can-transceiver.c
index c2cb93b..4525d3f 100644 (file)
--- a/drivers/phy/phy-can-transceiver.c
+++ b/drivers/phy/phy-can-transceiver.c
@@ -87,6 +87,7 @@ static int can_transceiver_phy_probe(struct platform_device *pdev)
        struct gpio_desc *standby_gpio;
        struct gpio_desc *enable_gpio;
        u32 max_bitrate = 0;
+       int err;
 
        can_transceiver_phy = devm_kzalloc(dev, sizeof(struct can_transceiver_phy), GFP_KERNEL);
        if (!can_transceiver_phy)
@@ -102,8 +103,8 @@ static int can_transceiver_phy_probe(struct platform_device *pdev)
                return PTR_ERR(phy);
        }
 
-       device_property_read_u32(dev, "max-bitrate", &max_bitrate);
-       if (!max_bitrate)
+       err = device_property_read_u32(dev, "max-bitrate", &max_bitrate);
+       if ((err != -EINVAL) && !max_bitrate)
                dev_warn(dev, "Invalid value for transceiver max bitrate. Ignoring bitrate limit\n");
        phy->attrs.max_link_rate = max_bitrate;