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([2a01:e34:ed2f:f020:9e7:3ac5:a930:2cd8]) by smtp.googlemail.com with ESMTPSA id z11sm17107463wrr.32.2020.05.18.13.18.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 18 May 2020 13:18:27 -0700 (PDT) Subject: Re: [PATCH v7 5/6] clocksource: Add Low Power STM32 timers driver To: Benjamin Gaignard , fabrice.gasnier@st.com, lee.jones@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, tglx@linutronix.de Cc: devicetree@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Benjamin Gaignard , Pascal Paillet References: <20200420121620.2099-1-benjamin.gaignard@st.com> <20200420121620.2099-6-benjamin.gaignard@st.com> From: Daniel Lezcano Message-ID: <9f737934-d92c-9ddf-f6fb-3ee64057ea18@linaro.org> Date: Mon, 18 May 2020 22:18:26 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200420121620.2099-6-benjamin.gaignard@st.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 20/04/2020 14:16, Benjamin Gaignard wrote: > From: Benjamin Gaignard > > Implement clock event driver using low power STM32 timers. > Low power timer counters running even when CPUs are stopped. > It could be used as clock event broadcaster to wake up CPUs but not like > a clocksource because each it rise an interrupt the counter restart from 0. > > Low power timers have a 16 bits counter and a prescaler which allow to > divide the clock per power of 2 to up 128 to target a 32KHz rate. > > Signed-off-by: Benjamin Gaignard > Signed-off-by: Pascal Paillet Acked-by: Daniel Lezcano [ ... ] -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD7E3C433DF for ; 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([2a01:e34:ed2f:f020:9e7:3ac5:a930:2cd8]) by smtp.googlemail.com with ESMTPSA id z11sm17107463wrr.32.2020.05.18.13.18.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 18 May 2020 13:18:27 -0700 (PDT) Subject: Re: [PATCH v7 5/6] clocksource: Add Low Power STM32 timers driver To: Benjamin Gaignard , fabrice.gasnier@st.com, lee.jones@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, tglx@linutronix.de References: <20200420121620.2099-1-benjamin.gaignard@st.com> <20200420121620.2099-6-benjamin.gaignard@st.com> From: Daniel Lezcano Message-ID: <9f737934-d92c-9ddf-f6fb-3ee64057ea18@linaro.org> Date: Mon, 18 May 2020 22:18:26 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200420121620.2099-6-benjamin.gaignard@st.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200518_131833_130256_A0F0DD02 X-CRM114-Status: GOOD ( 11.97 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Pascal Paillet , Benjamin Gaignard , linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMjAvMDQvMjAyMCAxNDoxNiwgQmVuamFtaW4gR2FpZ25hcmQgd3JvdGU6Cj4gRnJvbTogQmVu amFtaW4gR2FpZ25hcmQgPGJlbmphbWluLmdhaWduYXJkQGxpbmFyby5vcmc+Cj4gCj4gSW1wbGVt ZW50IGNsb2NrIGV2ZW50IGRyaXZlciB1c2luZyBsb3cgcG93ZXIgU1RNMzIgdGltZXJzLgo+IExv dyBwb3dlciB0aW1lciBjb3VudGVycyBydW5uaW5nIGV2ZW4gd2hlbiBDUFVzIGFyZSBzdG9wcGVk Lgo+IEl0IGNvdWxkIGJlIHVzZWQgYXMgY2xvY2sgZXZlbnQgYnJvYWRjYXN0ZXIgdG8gd2FrZSB1 cCBDUFVzIGJ1dCBub3QgbGlrZQo+IGEgY2xvY2tzb3VyY2UgYmVjYXVzZSBlYWNoIGl0IHJpc2Ug YW4gaW50ZXJydXB0IHRoZSBjb3VudGVyIHJlc3RhcnQgZnJvbSAwLgo+IAo+IExvdyBwb3dlciB0 aW1lcnMgaGF2ZSBhIDE2IGJpdHMgY291bnRlciBhbmQgYSBwcmVzY2FsZXIgd2hpY2ggYWxsb3cg dG8KPiBkaXZpZGUgdGhlIGNsb2NrIHBlciBwb3dlciBvZiAyIHRvIHVwIDEyOCB0byB0YXJnZXQg YSAzMktIeiByYXRlLgo+IAo+IFNpZ25lZC1vZmYtYnk6IEJlbmphbWluIEdhaWduYXJkIDxiZW5q YW1pbi5nYWlnbmFyZEBsaW5hcm8ub3JnPgo+IFNpZ25lZC1vZmYtYnk6IFBhc2NhbCBQYWlsbGV0 IDxwLnBhaWxsZXRAc3QuY29tPgoKQWNrZWQtYnk6IERhbmllbCBMZXpjYW5vIDxkYW5pZWwubGV6 Y2Fub0BsaW5hcm8ub3JnPgoKWyAuLi4gXQoKLS0gCjxodHRwOi8vd3d3LmxpbmFyby5vcmcvPiBM aW5hcm8ub3JnIOKUgiBPcGVuIHNvdXJjZSBzb2Z0d2FyZSBmb3IgQVJNIFNvQ3MKCkZvbGxvdyBM aW5hcm86ICA8aHR0cDovL3d3dy5mYWNlYm9vay5jb20vcGFnZXMvTGluYXJvPiBGYWNlYm9vayB8 CjxodHRwOi8vdHdpdHRlci5jb20vIyEvbGluYXJvb3JnPiBUd2l0dGVyIHwKPGh0dHA6Ly93d3cu bGluYXJvLm9yZy9saW5hcm8tYmxvZy8+IEJsb2cKCl9fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4 LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9y Zy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK