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Date: Wed, 26 Jun 2019 12:37:52 +0200 From: Daniel Lezcano <daniel.lezcano@...aro.org> To: Anson Huang <anson.huang@....com>, "tglx@...utronix.de" <tglx@...utronix.de>, "robh+dt@...nel.org" <robh+dt@...nel.org>, "mark.rutland@....com" <mark.rutland@....com>, "shawnguo@...nel.org" <shawnguo@...nel.org>, "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>, "kernel@...gutronix.de" <kernel@...gutronix.de>, "festevam@...il.com" <festevam@...il.com>, "l.stach@...gutronix.de" <l.stach@...gutronix.de>, Abel Vesa <abel.vesa@....com>, "ccaione@...libre.com" <ccaione@...libre.com>, "angus@...ea.ca" <angus@...ea.ca>, "andrew.smirnov@...il.com" <andrew.smirnov@...il.com>, "agx@...xcpu.org" <agx@...xcpu.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org> Cc: dl-linux-imx <linux-imx@....com> Subject: Re: [PATCH RESEND V2 1/3] clocksource/drivers/sysctr: Add optional clock-frequency property On 26/06/2019 03:42, Anson Huang wrote: > Hi, Daniel > >> On 23/06/2019 14:38, Anson.Huang@....com wrote: >>> From: Anson Huang <Anson.Huang@....com> >>> >>> 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
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