Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1423592

Re: [PATCH 0/3] Convert clk-fixed into module platform driver

Show all headers | View raw

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

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Re: [PATCH 0/3] Convert clk-fixed into module platform driver Stephen Boyd <sboyd@codeaurora.org> - 2016-06-14 19:40 +0200
  Re: [PATCH 0/3] Convert clk-fixed into module platform driver Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> - 2016-06-15 01:00 +0200
    Re: [PATCH 0/3] Convert clk-fixed into module platform driver Stephen Boyd <sboyd@codeaurora.org> - 2016-06-16 02:30 +0200

csiph-web