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xgene: Don't fail probe, if there is no clk resource for SGMII interfaces

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This change fixes following problem

[    1.827940] xgene-enet: probe of 1f210030.ethernet failed with error -2

which leads to a missing ethernet interface (reproducable at least on
Gigabyte MP30-AR0 and APM Mustang systems).

The check for a valid clk resource fails, because DT doesn't provide a
clock for sgenet1. But the driver doesn't use this clk, if the ethernet
port is connected via SGMII. Therefore this patch avoids probing for clk
on SGMII interfaces.

Fixes: 9aea7779b7 ("drivers: net: xgene: Fix crash on DT systems")
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Bogendoerfer 2017-07-13 10:57:40 +02:00 committed by David S. Miller
parent e4a6a3424b
commit 0db01097ca
1 changed files with 12 additions and 10 deletions
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22
drivers/net/ethernet/apm/xgene/xgene_enet_main.c
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@ -1785,16 +1785,18 @@ static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
xgene_enet_gpiod_get(pdata);
pdata->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(pdata->clk)) {
/* Abort if the clock is defined but couldn't be retrived.
* Always abort if the clock is missing on DT system as
* the driver can't cope with this case.
*/
if (PTR_ERR(pdata->clk) != -ENOENT || dev->of_node)
return PTR_ERR(pdata->clk);
/* Firmware may have set up the clock already. */
dev_info(dev, "clocks have been setup already\n");
if (pdata->phy_mode != PHY_INTERFACE_MODE_SGMII) {
pdata->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(pdata->clk)) {
/* Abort if the clock is defined but couldn't be
* retrived. Always abort if the clock is missing on
* DT system as the driver can't cope with this case.
*/
if (PTR_ERR(pdata->clk) != -ENOENT || dev->of_node)
return PTR_ERR(pdata->clk);
/* Firmware may have set up the clock already. */
dev_info(dev, "clocks have been setup already\n");
}
}
if (pdata->phy_mode != PHY_INTERFACE_MODE_XGMII)