On 26/06/2019 03:42, Anson Huang wrote: > Hi, Daniel > >> On 23/06/2019 14:38, Anson.Huang@xxxxxxx wrote: >>> From: Anson Huang <Anson.Huang@xxxxxxx> >>> >>> Systems which use platform driver model for clock driver require the >>> clock frequency to be supplied via device tree when system counter >>> driver is enabled. >>> >>> This is necessary as in the platform driver model the of_clk >>> operations do not work correctly because system counter driver is >>> initialized in early phase of system boot up, and clock driver using >>> platform driver model is NOT ready at that time, it will cause system >>> counter driver initialization failed. >>> >>> Add the optinal clock-frequency to the device tree bindings of the NXP >>> system counter, so the frequency can be handed in and the of_clk >>> operations can be skipped. >> >> Isn't it possible to create a fixed-clock and refer to it? So no need to create a >> specific action before calling timer_of_init() ? >> > > As the clock must be ready before the TIMER_OF_DECLARE, so adding a CLK_OF_DECLARE_DRIVER in > clock driver to ONLY register a fixed-clock? The system counter's frequency are different on different > platforms, so adding fixed clock in system counter driver is NOT a good idea, ONLY the DT node or the > clock driver can create this fixed clock according to platforms, can you advise where to create this fixed > clock is better? Can you point me to a DT with the "nxp,sysctr-timer" ? -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog
