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VI1PR0402MB3421.eurprd04.prod.outlook.com (52.134.2.140) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2750.21; Tue, 25 Feb 2020 08:58:22 +0000 Received: from VI1PR0402MB3839.eurprd04.prod.outlook.com ([fe80::8881:e155:f058:c0d1]) by VI1PR0402MB3839.eurprd04.prod.outlook.com ([fe80::8881:e155:f058:c0d1%4]) with mapi id 15.20.2750.021; Tue, 25 Feb 2020 08:58:22 +0000 From: Daniel Baluta To: Anson Huang , "mturquette@baylibre.com" , "sboyd@kernel.org" , "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" , "festevam@gmail.com" , Leonard Crestez , Abel Vesa , Peng Fan , Jacky Bai , Andy Duan , "linux-clk@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" CC: dl-linux-imx Subject: Re: [PATCH 1/4] clk: imx8mn: A53 core clock no need to be critical Thread-Topic: [PATCH 1/4] clk: imx8mn: A53 core clock no need to be critical Thread-Index: AQHV67lXcMqetl8NvkmUcnxVH88LyKgrnAKA 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Daniel Baluta To: Anson Huang , "mturquette@baylibre.com" , "sboyd@kernel.org" , "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" , "festevam@gmail.com" , Leonard Crestez , Abel Vesa , Peng Fan , Jacky Bai , Andy Duan , "linux-clk@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH 1/4] clk: imx8mn: A53 core clock no need to be critical Thread-Topic: [PATCH 1/4] clk: imx8mn: A53 core clock no need to be critical Thread-Index: AQHV67lXcMqetl8NvkmUcnxVH88LyKgrnAKA Date: Tue, 25 Feb 2020 08:58:22 +0000 Message-ID: <65500dc7-dc03-7dc1-92cd-5557cd73232e@nxp.com> References: <1582620554-32689-1-git-send-email-Anson.Huang@nxp.com> In-Reply-To: <1582620554-32689-1-git-send-email-Anson.Huang@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=daniel.baluta@nxp.com; x-originating-ip: [89.37.124.34] 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linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Anson, One comment inline: On 25.02.2020 10:49, Anson Huang wrote: > 'A53_CORE' is just a mux and no need to be critical, being critical > will cause its parent clock always ON which does NOT make sense, > to make sure CPU's hardware clock source NOT being disabled during > clock tree setup, need to move the 'A53_SRC'/'A53_CORE' reparent > operations to after critical clock 'ARM_CLK' setup finished. > > Signed-off-by: Anson Huang > --- > drivers/clk/imx/clk-imx8mn.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/clk/imx/clk-imx8mn.c b/drivers/clk/imx/clk-imx8mn.c > index 83618af..0bc7070 100644 > --- a/drivers/clk/imx/clk-imx8mn.c > +++ b/drivers/clk/imx/clk-imx8mn.c > @@ -428,7 +428,7 @@ static int imx8mn_clocks_probe(struct platform_device *pdev) > hws[IMX8MN_CLK_GPU_SHADER_DIV] = hws[IMX8MN_CLK_GPU_SHADER]; > > /* CORE SEL */ > - hws[IMX8MN_CLK_A53_CORE] = imx_clk_hw_mux2_flags("arm_a53_core", base + 0x9880, 24, 1, imx8mn_a53_core_sels, ARRAY_SIZE(imx8mn_a53_core_sels), CLK_IS_CRITICAL); > + hws[IMX8MN_CLK_A53_CORE] = imx_clk_hw_mux2("arm_a53_core", base + 0x9880, 24, 1, imx8mn_a53_core_sels, ARRAY_SIZE(imx8mn_a53_core_sels)); > > /* BUS */ > hws[IMX8MN_CLK_MAIN_AXI] = imx8m_clk_hw_composite_critical("main_axi", imx8mn_main_axi_sels, base + 0x8800); > @@ -559,15 +559,15 @@ static int imx8mn_clocks_probe(struct platform_device *pdev) > > hws[IMX8MN_CLK_DRAM_ALT_ROOT] = imx_clk_hw_fixed_factor("dram_alt_root", "dram_alt", 1, 4); > > - clk_hw_set_parent(hws[IMX8MN_CLK_A53_SRC], hws[IMX8MN_SYS_PLL1_800M]); > - clk_hw_set_parent(hws[IMX8MN_CLK_A53_CORE], hws[IMX8MN_ARM_PLL_OUT]); Why do you need to move this code? If there is a reason please add a separate patch and explain why. > - > hws[IMX8MN_CLK_ARM] = imx_clk_hw_cpu("arm", "arm_a53_core", > hws[IMX8MN_CLK_A53_CORE]->clk, > hws[IMX8MN_CLK_A53_CORE]->clk, > hws[IMX8MN_ARM_PLL_OUT]->clk, > hws[IMX8MN_CLK_A53_DIV]->clk); > > + clk_hw_set_parent(hws[IMX8MN_CLK_A53_SRC], hws[IMX8MN_SYS_PLL1_800M]); > + clk_hw_set_parent(hws[IMX8MN_CLK_A53_CORE], hws[IMX8MN_ARM_PLL_OUT]); > + > imx_check_clk_hws(hws, IMX8MN_CLK_END); > > ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_hw_data); _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel