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[77.130.102.113]) by smtp.googlemail.com with ESMTPSA id l16sm2253662wrw.42.2019.06.27.03.34.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 27 Jun 2019 03:34:21 -0700 (PDT) Subject: Re: [PATCH RESEND V2 1/3] clocksource/drivers/sysctr: Add optional clock-frequency property To: Anson.Huang@nxp.com, tglx@linutronix.de, robh+dt@kernel.org, mark.rutland@arm.com, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, l.stach@pengutronix.de, abel.vesa@nxp.com, ccaione@baylibre.com, angus@akkea.ca, andrew.smirnov@gmail.com, agx@sigxcpu.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Linux-imx@nxp.com References: <20190623123850.22584-1-Anson.Huang@nxp.com> From: Daniel Lezcano Openpgp: preference=signencrypt Autocrypt: addr=daniel.lezcano@linaro.org; prefer-encrypt=mutual; keydata= mQINBFv/yykBEADDdW8RZu7iZILSf3zxq5y8YdaeyZjI/MaqgnvG/c3WjFaunoTMspeusiFE 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tYUhisTESeesbvWSPO5uNqqy1dAFw+dqRcF5gXIh3NKX0gqiAA87NM7nL5ym/CNpJ7z7nRC8 qePOXubgouxumi5RQs1+crBmCDa/AyJHKdG2mqCt9fx5EPbDpw6Zzx7hgURh4ikHoS7/tLjK iqWjuat8/HWc01yEd8rtkGuUcMqbCi1XhcAmkaOnX8FYscMRoyyMrWClRZEQRokqZIj79+PR adkDXtr4MeL8BaB7Ij2oyRVjXUwhFQNKi5Z5Rve0a3zvGkkqw8Mz20BOksjSWjAF6g9byukl CUVjC03PdMSufNLK06x5hPc/c4tFR4J9cLrV+XxdCX7r0zGos9SzTPGNuIk1LK++S3EJhLFj 4eoWtNhMWc1uiTf9ENza0ntqH9XBWEQ6IA1gubCniGG+Xg== Message-ID: Date: Thu, 27 Jun 2019 12:34:19 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190623123850.22584-1-Anson.Huang@nxp.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 23/06/2019 14:38, Anson.Huang@nxp.com wrote: > From: Anson Huang > > 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. > > Signed-off-by: Anson Huang > --- > Changes since V1: > - improve commit log, no content change. > --- > Documentation/devicetree/bindings/timer/nxp,sysctr-timer.txt | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/Documentation/devicetree/bindings/timer/nxp,sysctr-timer.txt b/Documentation/devicetree/bindings/timer/nxp,sysctr-timer.txt > index d576599..c9907a0 100644 > --- a/Documentation/devicetree/bindings/timer/nxp,sysctr-timer.txt > +++ b/Documentation/devicetree/bindings/timer/nxp,sysctr-timer.txt > @@ -14,6 +14,11 @@ Required properties: > - clocks : Specifies the counter clock. > - clock-names: Specifies the clock's name of this module > > +Optional properties: > + > +- clock-frequency : Specifies system counter clock frequency and indicates system > + counter driver to skip clock operations. > + Shouldn't it be required and mutually exclusive with clocks/clock-names? > Example: > > system_counter: timer@306a0000 { > @@ -22,4 +27,5 @@ Example: > clocks = <&clk_8m>; > clock-names = "per"; > interrupts = ; > + clock-frequency = <8333333>; > }; > -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog