net: designware: socfpga: fix possible invalid pointer deref ...

In cases where the reset controller specification in the device tree is
malformed, we get an error pointer back from reset_control_get. This
compares unequal to NULL and would cause an access violation when passed
to reset_control_(de)?assert.

Fix this by propagating the error. When the reset controller is missing,
reset_control_(de)?assert will be passed NULL pointers, rendering them
no-ops.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: designware: socfpga: fix phy setup for Arria10 ...

Barebox-version of the Linux v5.2 patch:

    40ae255
    net: stmmac: socfpga: fix phy and ptp_ref setup for Arria10/Stratix10

    On the Arria10, Agilex, and Stratix10 SoC, there are a few differences from
    the Cyclone5 and Arria5:
     - The emac PHY setup bits are in separate registers.
     - The PTP reference clock select mask is different.
     - The register to enable the emac signal from FPGA is different.

    Thus, this patch creates a separate function for setting the phy modes on
    Arria10/Agilex/Stratix10. The separation is based a new DTS binding:
    "altr,socfpga-stmmac-a10-s10".

    Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
    Signed-off-by: David S. Miller <davem@davemloft.net>

The new DTS binding is already part of v2019.10.0 and the driver doesn't
probe on Arria10 without the new binding introduced in this patch.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/spdx'

drivers: net: convert drivers to spdx ...

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Reviewed-by: Roland Hieber <r.hieber@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: designware: socfpga: return error value ...

Instead of silently dropping the return value of socfpga_dwc_set_phy_mode,
use it as the return value of the function, instead.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: designware: make sure DMA is disabled on kernel start. ...

Halt is not automatically executed if we start the kernel.
So, we may have potentially memory corruptions.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: add SoCFPGA-specific designware driver ...

Add a driver for the SoCFPGA-specific version of the designware ethernet ip core.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>