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Message-ID: <155007977634.115909.4465011219844819801@swboyd.mtv.corp.google.com>
Date: Wed, 13 Feb 2019 09:42:56 -0800
From: Stephen Boyd <sboyd@...nel.org>
To: "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"festevam@...il.com" <festevam@...il.com>,
"kernel@...gutronix.de" <kernel@...gutronix.de>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"mark.rutland@....com" <mark.rutland@....com>,
"mturquette@...libre.com" <mturquette@...libre.com>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
"viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
Aisheng Dong <aisheng.dong@....com>,
Anson Huang <anson.huang@....com>,
Daniel Baluta <daniel.baluta@....com>
Cc: dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH V3 2/2] clk: imx: scu: add cpu frequency scaling support
Quoting Anson Huang (2019-02-13 07:59:32)
> @@ -145,6 +161,39 @@ static long clk_scu_round_rate(struct clk_hw *hw, unsigned long rate,
> return rate;
> }
>
> +static bool clk_scu_atf_set_cpu_rate(struct clk_hw *hw, unsigned long rate)
> +{
> + struct clk_scu *clk = to_clk_scu(hw);
> + struct arm_smccc_res res;
> + unsigned int cluster_id;
> + int i;
> +
> + /* CPU frequency scaling can ONLY be done by ARM-Trusted-Firmware */
> + if (clk->clk_type == IMX_SC_PM_CLK_CPU) {
> + for (i = 0; i < ARRAY_SIZE(imx_sc_cpufreq_data); i++) {
> + if (!strcmp(clk_hw_get_name(hw),
> + imx_sc_cpufreq_data[i].clk_name)) {
> + cluster_id = imx_sc_cpufreq_data[i].cluster_id;
> + break;
> + }
> + }
Is there some reason why these clks can't be determined once at boot
time? It would be a good idea to avoid doing any sort of string
comparison here, instead just calling the right arm_smccc_smc with the
right arguments based on code that registers those types of clks.
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