[PATCH 2/4] mmc: sunxi: Make sample clocks optional
From: Hans de Goede <hidden>
Date: 2016-07-30 14:25:40
Also in:
linux-devicetree, linux-mmc
From: Hans de Goede <hidden>
Date: 2016-07-30 14:25:40
Also in:
linux-devicetree, linux-mmc
Hi, On 25-07-16 10:18, Maxime Ripard wrote:
Hi, On Sat, Jul 16, 2016 at 12:46:02PM +0200, Hans de Goede wrote:quoted
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.
Ok, I've prepared a new version using a new compatible. Regards, Hans