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<22a24fe6-9e62-4aba-825e-aee214f683ee@amlogic.com> Date: Wed, 25 Jun 2025 10:52:28 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 4/6] clk: meson: t7: add support for the T7 SoC PLL clock To: Jerome Brunet Cc: Xianwei Zhao , Chuan Liu , Neil Armstrong , Kevin Hilman , Stephen Boyd , Michael Turquette , Dmitry Rokosov , robh+dt , Rob Herring , devicetree , linux-clk , linux-amlogic , linux-kernel , linux-arm-kernel References: <20250509074825.1933254-1-jian.hu@amlogic.com> <20250509074825.1933254-5-jian.hu@amlogic.com> <1jtt5ny6gq.fsf@starbuckisacylon.baylibre.com> <4dd25114-212d-44d6-938a-63871750c292@amlogic.com> <1jh60fd52u.fsf@starbuckisacylon.baylibre.com> From: Jian Hu In-Reply-To: <1jh60fd52u.fsf@starbuckisacylon.baylibre.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SI2P153CA0012.APCP153.PROD.OUTLOOK.COM (2603:1096:4:140::15) To KL1PR03MB7149.apcprd03.prod.outlook.com (2603:1096:820:ca::7) 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List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2025/6/17 0:27, Jerome Brunet wrote: > [ EXTERNAL EMAIL ] > > On Thu 12 Jun 2025 at 21:02, Jian Hu wrote: > >>>> + >>>> +static struct clk_regmap t7_pcie_pll_od = { >>>> + .data = &(struct clk_regmap_div_data){ >>>> + .offset = ANACTRL_PCIEPLL_CTRL0, >>>> + .shift = 16, >>>> + .width = 5, >>>> + .flags = CLK_DIVIDER_ONE_BASED | >>>> + CLK_DIVIDER_ALLOW_ZERO, >>> What's the behaviour of the divider on zero then ? >> >> If there is no CLK_DIVDER_ALLOW_ZERO, there is a warning when registering >> t7_pcie_pll_od. >> >> like this: >> >> ------------[ cut here ]------------ >> WARNING: CPU: 1 PID: 1 at drivers/clk/clk-divider.c:140 >> divider_recalc_rate+0xfc/0x100 >> pcie_pll_od: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set >> Modules linked in: >> CPU: 1 PID: 1 Comm: swapper/0 Not tainted >> 5.4.283-09976-ga803e94eed88-dirty #91 >> Hardware name: tm2_t962e2_ab311 (DT) >> Call trace: >> [ffffffc020003750+ 64][] dump_backtrace+0x0/0x1e4 >> [ffffffc020003790+ 32][] show_stack+0x24/0x34 >> [ffffffc0200037b0+ 96][] dump_stack+0xbc/0x108 >> [ffffffc020003810+ 144][] __warn+0xf4/0x1b8 >> [ffffffc0200038a0+ 64][] warn_slowpath_fmt+0xac/0xc8 >> [ffffffc0200038e0+ 64][] divider_recalc_rate+0xfc/0x100 >> [ffffffc020003920+ 80][] >> clk_regmap_div_recalc_rate+0x74/0x88 >> [ffffffc020003970+ 96][] __clk_register+0x62c/0xb78 >> >> so add it to avoid the warning. > That does not really answer my question Sorry, I did not get you before. I have set OD to 0.  And measure pcie frequency,  It is 37.5Mhz. 4800Mhz/2/32/2=37.5Mhz, and the OD equal zero means divided by 32 in fact. Here is the test result: devm 0xfe008140 32 0xD40C04C8 cat /sys/kernel/debug/meson-clk-msr/measure_summary | grep pcie [16] pcie_clk_inp      37500000  +/1 3125HZ the OD divider is N crossover. it is one based. and It's possible to go from 1 to 31 crossovers.