Messages in this thread | | | Date | Thu, 21 May 2015 09:19:00 +0200 | Subject | Re: [PATCH v8 4/9] mfd: Add binding document for NVIDIA Tegra XUSB | From | Linus Walleij <> |
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On Wed, May 20, 2015 at 4:52 PM, Thierry Reding <thierry.reding@gmail.com> wrote:
> I'm a little confused by the simple-mfd approach. The only code I see in > linux-next for this is a single line that adds the "simple-mfd" string > to the OF device ID table in drivers/of/platform.c. As far as I can tell > this will merely cause child devices to be created. There won't be a > shared regmap and resources won't be set up properly either.
That is correct. The simple-mfd is a two-component approach.
Ideally, in the simplest case, you combine simple-mfd with syscon.
foo@0 { compatible = "foo", "syscon", "simple-mfd"; reg = <0x10000000 0x1000>;
bar@1 { compatible = "bar"; };
baz@2 { compatible = "baz"; }; };
This will instantiate bar and baz.
These subdrivers then probe and:
probe() { struct regmap *map;
map = syscon_node_to_regmap(parent->of_node); (...) }
Simple, syscon is the MFD hub.
Yours, Linus Walleij
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