[PATCH] net: stmmac: make reset control an optional requirement

From: dinguyen
Date: Fri Mar 06 2015 - 16:52:53 EST


From: Dinh Nguyen <dinguyen@xxxxxxxxxxxxxxxxxxxxx>

Not having a reset control line to the ethernet controller should not be a
hard failure. Instead, add support for deferred probing and just print out
a debug statement.

Signed-off-by: Dinh Nguyen <dinguyen@xxxxxxxxxxxxxxxxxxxxx>
Cc: Vince Bridgers <vbridger@xxxxxxxxxxxxxxxxxxxxx>
CC: David S. Miller <davem@xxxxxxxxxxxxx>
---
drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
index e97074c..ecb0b9b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
@@ -91,7 +91,9 @@ static int socfpga_dwmac_parse_data(struct socfpga_dwmac *dwmac, struct device *
STMMAC_RESOURCE_NAME);
if (IS_ERR(dwmac->stmmac_rst)) {
dev_info(dev, "Could not get reset control!\n");
- return -EINVAL;
+ if (PTR_ERR(dwmac->stmmac_rst) == -EPROBE_DEFER)
+ ret = -EPROBE_DEFER;
+ dwmac->stmmac_rst = NULL;
}

dwmac->interface = of_get_phy_mode(np);
--
2.2.1

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