Merge branch 'net-stmmac-qcon-ethqos-rgmii-accessor-cleanups'

Russell King says:

====================
net: stmmac: qcon-ethqos: "rgmii" accessor cleanups

This series cleans up the "rgmii" accessors in qcom-ethqos.

readl() and writel() return and take a u32 for the value. Rather than
implicitly casting this to an int, keep it as a u32.

Add set/clear functions to reduce the code and make it easier to read.

Finally, convert the open-coded poll loops to use the iopoll helpers.

Note that patch 1 has a checkpatch warning concerning "volatile" -
I'm changing the type here, and the "volatile" is removed in patch 3.
I do not feel it is appropriate to remove it in patch 1.
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Link: https://patch.msgid.link/aR76i0HjXitfl7xk@shell.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>