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=-17.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 89BA2C43381 for ; Tue, 23 Feb 2021 16:35:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6A0A564E68 for ; Tue, 23 Feb 2021 16:35:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233466AbhBWQfQ (ORCPT ); Tue, 23 Feb 2021 11:35:16 -0500 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:17018 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S233389AbhBWQfN (ORCPT ); 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Tue, 23 Feb 2021 17:34:15 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 67FA010002A; Tue, 23 Feb 2021 17:34:13 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 41BC62252A5; Tue, 23 Feb 2021 17:34:13 +0100 (CET) Received: from lmecxl0572.lme.st.com (10.75.127.47) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 23 Feb 2021 17:34:12 +0100 Subject: Re: [PATCH v2 02/14] clk: stm32mp1: merge 'ck_hse_rtc' and 'ck_rtc' into one clock To: Stephen Boyd , Alexandre Torgue , Etienne Carriere , "Maxime Coquelin" , Michael Turquette , Philipp Zabel , "Rob Herring" , CC: , , , , References: <20210126090120.19900-1-gabriel.fernandez@foss.st.com> <20210126090120.19900-3-gabriel.fernandez@foss.st.com> <161285764074.418021.15522379930579131077@swboyd.mtv.corp.google.com> <5cc12945-0347-820c-1125-30ab4a947a00@foss.st.com> <161369805767.1254594.5233096495913117772@swboyd.mtv.corp.google.com> From: "gabriel.fernandez@foss.st.com" Message-ID: Date: Tue, 23 Feb 2021 17:34:11 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <161369805767.1254594.5233096495913117772@swboyd.mtv.corp.google.com> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Originating-IP: [10.75.127.47] X-ClientProxiedBy: SFHDAG1NODE1.st.com (10.75.127.1) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.761 definitions=2021-02-23_08:2021-02-23,2021-02-23 signatures=0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/19/21 2:27 AM, Stephen Boyd wrote: > Quoting gabriel.fernandez@foss.st.com (2021-02-12 00:08:40) >> On 2/9/21 9:00 AM, Stephen Boyd wrote: >>> Quoting gabriel.fernandez@foss.st.com (2021-01-26 01:01:08) >>>> From: Gabriel Fernandez >>>> >>>> 'ck_rtc' has multiple clocks as input (ck_hsi, ck_lsi, and ck_hse). >>>> A divider is available only on the specific rtc input for ck_hse. >>>> This Merge will facilitate to have a more coherent clock tree >>>> in no trusted / trusted world. >>>> >>>> Signed-off-by: Gabriel Fernandez >>>> --- >>>> drivers/clk/clk-stm32mp1.c | 49 +++++++++++++++++++++++++++++++++----- >>>> 1 file changed, 43 insertions(+), 6 deletions(-) >>>> >>>> diff --git a/drivers/clk/clk-stm32mp1.c b/drivers/clk/clk-stm32mp1.c >>>> index 35d5aee8f9b0..0e1d4427a8df 100644 >>>> --- a/drivers/clk/clk-stm32mp1.c >>>> +++ b/drivers/clk/clk-stm32mp1.c >>>> @@ -245,7 +245,7 @@ static const char * const dsi_src[] = { >>>> }; >>>> >>>> static const char * const rtc_src[] = { >>>> - "off", "ck_lse", "ck_lsi", "ck_hse_rtc" >>>> + "off", "ck_lse", "ck_lsi", "ck_hse" >>>> }; >>>> >>>> static const char * const mco1_src[] = { >>>> @@ -1031,6 +1031,42 @@ static struct clk_hw *clk_register_cktim(struct device *dev, const char *name, >>>> return hw; >>>> } >>>> >>>> +/* The divider of RTC clock concerns only ck_hse clock */ >>>> +#define HSE_RTC 3 >>>> + >>>> +static unsigned long clk_divider_rtc_recalc_rate(struct clk_hw *hw, >>>> + unsigned long parent_rate) >>>> +{ >>>> + if (clk_hw_get_parent(hw) == clk_hw_get_parent_by_index(hw, HSE_RTC)) >>>> + return clk_divider_ops.recalc_rate(hw, parent_rate); >>>> + >>>> + return parent_rate; >>>> +} >>>> + >>>> +static long clk_divider_rtc_round_rate(struct clk_hw *hw, unsigned long rate, >>>> + unsigned long *prate) >>>> +{ >>>> + if (clk_hw_get_parent(hw) == clk_hw_get_parent_by_index(hw, HSE_RTC)) >>> This clk op can be called at basically any time. Maybe this should use >>> the determine rate op and then look to see what the parent is that comes >>> in via the rate request structure? Or is the intention to keep this >>> pinned to one particular parent? Looking at this right now it doesn't >>> really make much sense why the current parent state should play into >>> what rate the clk can round to, unless there is some more clk flags >>> going on that constrain the ability to change this clk's parent. >> Yes the intention is to keep this pinned for one particular parent. >> >> This divider is only applied on the 4th input of the MUX of the RTC and >> >> doesn't affect the HSE frequency for all the system. >> >> >> Oscillators >>  ----- >> | lse |----------------+----------------> ck_lse >>  -----                 | >>  -----                 | >> | lsi |------------+--------------------> ck_lsi >>  -----             |   | >>                    |   | >>  -----             |   | >> | hse |----+-------|---|----------------> ck_hse >>  -----     |       |   | >>            |       |   |         |\ mux >>            |       |   |  OFF -->| \ >>            |       |   |         |  \     gate >>            |       |   --------->|  |     --- >>            |       |             |  |--->|   |--> ck_rtc >>            |       ------------->|  |     --- >>            |    -----------      |  | >>             ----| % 1 to 64 |--->| / >>                  -----------     |/ >>                    divider >> >> I manage the RTC with a clock composite with a gate a mux and a specific >> rate ops for hse input. >> >> That why i need to the parent state. >> > So would using determine_rate op instead of round_rate op help here? That > will provide the current parent rate and hw pointer in the rate request > structure. yes u understand what you mean, i will send you a v3. Many Thanks. 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SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 23 Feb 2021 17:34:12 +0100 Subject: Re: [PATCH v2 02/14] clk: stm32mp1: merge 'ck_hse_rtc' and 'ck_rtc' into one clock To: Stephen Boyd , Alexandre Torgue , Etienne Carriere , "Maxime Coquelin" , Michael Turquette , Philipp Zabel , "Rob Herring" , References: <20210126090120.19900-1-gabriel.fernandez@foss.st.com> <20210126090120.19900-3-gabriel.fernandez@foss.st.com> <161285764074.418021.15522379930579131077@swboyd.mtv.corp.google.com> <5cc12945-0347-820c-1125-30ab4a947a00@foss.st.com> <161369805767.1254594.5233096495913117772@swboyd.mtv.corp.google.com> From: "gabriel.fernandez@foss.st.com" Message-ID: Date: Tue, 23 Feb 2021 17:34:11 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <161369805767.1254594.5233096495913117772@swboyd.mtv.corp.google.com> Content-Language: en-US X-Originating-IP: [10.75.127.47] 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