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net: qcom/emac: add support for emulation systems

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On emulation systems, the EMAC's internal PHY ("SGMII") is not present,
but is not needed for network functionality.  So just display a warning
message and ignore the SGMII.

Tested-by: Philip Elcan <pelcan@codeaurora.org>
Tested-by: Adam Wallis <awallis@codeaurora.org>
Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Timur Tabi 2017-06-23 14:33:30 -05:00 committed by David S. Miller
parent 867ae6abc2
commit ceef551faa
1 changed files with 21 additions and 2 deletions
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23
drivers/net/ethernet/qualcomm/emac/emac-sgmii.c
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@ -297,6 +297,14 @@ static const struct of_device_id emac_sgmii_dt_match[] = {
{}
};
/* Dummy function for systems without an internal PHY. This avoids having
* to check for NULL pointers before calling the functions.
*/
static int emac_sgmii_dummy(struct emac_adapter *adpt)
{
return 0;
}
int emac_sgmii_config(struct platform_device *pdev, struct emac_adapter *adpt)
{
struct platform_device *sgmii_pdev = NULL;
@ -311,8 +319,19 @@ int emac_sgmii_config(struct platform_device *pdev, struct emac_adapter *adpt)
emac_sgmii_acpi_match);
if (!dev) {
dev_err(&pdev->dev, "cannot find internal phy node\n");
return -ENODEV;
dev_warn(&pdev->dev, "cannot find internal phy node\n");
/* There is typically no internal PHY on emulation
* systems, so if we can't find the node, assume
* we are on an emulation system and stub-out
* support for the internal PHY. These systems only
* use ACPI.
*/
phy->open = emac_sgmii_dummy;
phy->close = emac_sgmii_dummy;
phy->link_up = emac_sgmii_dummy;
phy->link_down = emac_sgmii_dummy;
return 0;
}
sgmii_pdev = to_platform_device(dev);