[PATCH 2/4] mmc: sunxi: Make sample clocks optional

[Maxime Ripard]

Hi,

On Sat, Jul 16, 2016 at 12:46:02PM +0200, Hans de Goede wrote:
> It turns out that sun4i (A10) and sun5i (A13 & co) do not have sample
> clocks, so make them optional.
> 
> Since these do not have sample clocks, they cannot (reliably) do
> DDR rates, so only set MMC_CAP_1_8V_DDR when we do have sample clks.
> 
> Note this patch only changes the devm_clk_get error checking and sets
> the clocks to NULL if they don't exists. All the clk_foo calls accept
> a NULL clk and will return success when called with a NULL clk, so this
> is all that is necessary.

The clocks aren't really optional. They're not needed for the A10 /
A13, and mandatory for the A20 and later.

Having a new compatible for the A20 that would require that clock and
not require it for the A10/A13 anymore seems more appropriate.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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