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[89.81.167.76]) by smtp.googlemail.com with ESMTPSA id s131-v6sm4746586wmf.2.2018.08.31.01.01.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 31 Aug 2018 01:01:46 -0700 (PDT) Subject: Re: [PATCH 2/2] clk: imx: imx7d: remove clks_init_on array To: Stephen Boyd , "kernel@pengutronix.de" , "linux-arm-kernel@lists.infradead.org" , "linux-clk@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "mturquette@baylibre.com" , "s.hauer@pengutronix.de" , "shawnguo@kernel.org" , Anson Huang , Fabio Estevam , Peng Fan , Rob Herring Cc: dl-linux-imx References: <1533703167-26583-1-git-send-email-Anson.Huang@nxp.com> <1533703167-26583-2-git-send-email-Anson.Huang@nxp.com> <153567894721.93865.4092113232222931488@swboyd.mtv.corp.google.com> From: Jerome Forissier Message-ID: Date: Fri, 31 Aug 2018 10:01:44 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <153567894721.93865.4092113232222931488@swboyd.mtv.corp.google.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 08/31/2018 03:29 AM, Stephen Boyd wrote: > Quoting Peng Fan (2018-08-12 18:15:41) >> Hi Anson, >> >>>>> -----Original Message----- >>>>> From: Anson Huang >>>>> Sent: 2018年8月8日 12:39 >>>>> To: shawnguo@kernel.org; s.hauer@pengutronix.de; >>>>> kernel@pengutronix.de; Fabio Estevam ; >>>>> mturquette@baylibre.com; sboyd@kernel.org; >>>>> linux-arm-kernel@lists.infradead.org; >>>>> linux-clk@vger.kernel.org; linux-kernel@vger.kernel.org >>>>> Cc: dl-linux-imx >>>>> Subject: [PATCH 2/2] clk: imx: imx7d: remove clks_init_on array >>>>> >>>>> Clock framework will enable those clocks registered with >>>>> CLK_IS_CRITICAL flag, so no need to have clks_init_on array during >>>>> clock >>>> initialization now. >>>> >>>> Will it be more flexible to parse dts saying "critical-clocks = " >>>> or "init-on-arrary=" >>>> and enable those clocks? >>> >>> Parsing the clocks arrays from dtb is another way of enabling critical clocks, but >>> for current i.MX6/7 platforms, we implement it in same way as most of other >>> SoCs, currently I did NOT see any necessity of putting them in dtb, just adding >>> flag during clock registering is more simple, if there is any special requirement >>> for different clocks set to be enabled, then we can add support to enable the >>> method of parsing critical-clocks from dtb. Just my two cents. >> >> Thinking about OP-TEE want to use one device, but it's clocks are registered >> by Linux, because there is no module in Linux side use it, it will shutdown the clock, >> which cause OP-TEE could not access the device. >> >> Then people have to modify clk code to add CLK_IS_CRITICAL flag to make sure >> the clocks are not shutdown by Linux. >> >> However adding a new property in clk node and let driver code parse the dts, >> there is no need to modify clk driver code when OP-TEE needs another device clock. >> > > If OP-TEE needs linux to keep things on then why can't the OP-TEE driver > in Linux probe, acquire clocks, and keep the clks enabled forever? Sounds reasonable, but how could this be done without introducing platform-specific stuff in the OP-TEE driver? > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >