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net: qcom/emac: add support for emulation systems
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>
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@ -297,6 +297,14 @@ static const struct of_device_id emac_sgmii_dt_match[] = {
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{}
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};
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/* Dummy function for systems without an internal PHY. This avoids having
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* to check for NULL pointers before calling the functions.
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*/
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static int emac_sgmii_dummy(struct emac_adapter *adpt)
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{
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return 0;
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}
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int emac_sgmii_config(struct platform_device *pdev, struct emac_adapter *adpt)
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{
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struct platform_device *sgmii_pdev = NULL;
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@ -311,8 +319,19 @@ int emac_sgmii_config(struct platform_device *pdev, struct emac_adapter *adpt)
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emac_sgmii_acpi_match);
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if (!dev) {
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dev_err(&pdev->dev, "cannot find internal phy node\n");
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return -ENODEV;
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dev_warn(&pdev->dev, "cannot find internal phy node\n");
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/* There is typically no internal PHY on emulation
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* systems, so if we can't find the node, assume
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* we are on an emulation system and stub-out
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* support for the internal PHY. These systems only
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* use ACPI.
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*/
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phy->open = emac_sgmii_dummy;
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phy->close = emac_sgmii_dummy;
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phy->link_up = emac_sgmii_dummy;
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phy->link_down = emac_sgmii_dummy;
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return 0;
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}
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sgmii_pdev = to_platform_device(dev);
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