Messages in this thread | | | Date | Wed, 15 Jun 2016 17:27:27 -0700 | From | Stephen Boyd <> | Subject | Re: [PATCH 0/3] Convert clk-fixed into module platform driver |
| |
On 06/15, Ricardo Ribalda Delgado wrote: > Hi Stephen > > Assume this device tree overlay: > > > &bus0{ > > axi_clk: axi_clk { > compatible = "fixed-clock"; > #clock-cells = <0x0>; > clock-frequency = <125000000>; > }; > > iic_0: iic { > #address-cells = <1>; > #size-cells = <1>; > compatible = "xlnx,xps-iic-2.00.a"; > reg = < 0x00030000 0x10000 >; > interrupt-parent = <&xps_intc_0>; > interrupts = < 2 2 >; > clocks = <&axi_clk>; > } ; > > } > > Which is basically a new i2c master and a fixed clock definition. > > The fixed clock driver will only be probed to the driver at arch > initialization, when of_clk_init is called. The device overlay can be > added at any point, usually after arch init. Which will result in ii_0 > failing to probe, because it is missing its clock. > > This changeset allows fixed clocks to be added after of_clk_init is > called, by converting the driver into a platform driver. >
Ok, so this is about supporting clks in overlays. I2C only comes into the picture here because it's a consumer and happens to also be on the same overlay.
-- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
| |