Messages in this thread | | | Subject | Re: [PATCH V2 1/2] clk: imx: add mcore_booted module paratemter | From | Stephen Boyd <> | Date | Thu, 17 Mar 2022 12:37:15 -0700 |
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Quoting Peng Fan (OSS) (2022-02-28 04:41:11) > From: Peng Fan <peng.fan@nxp.com> > > Add mcore_booted boot parameter which could simplify AMP clock > management. To i.MX8M, there is CCM(clock control Module) to generate > clock root clock, anatop(analog PLL module) to generate PLL, and CCGR > (clock gating) to gate clocks to peripherals. As below: > anatop->ccm->ccgr->peripheral > > Linux handles the clock management and the auxiliary core is under > control of Linux. Although there is per hardware domain control for CCGR > and CCM, auxiliary core normally only use CCGR hardware domain control > to avoid linux gate off the clk to peripherals and leave CCM ana anatop > to Linux. > > Per NXP hardware design, because CCGR already support gate to > peripherals, and clk root gate power leakage is negligible. So > when in AMP case, we could not register the clk root gate. > > Signed-off-by: Peng Fan <peng.fan@nxp.com> > --- > > V2: > Switch to use module parameter, tested on i.MX8MP-EVK
Why is a module parameter being used? I'd expect this informatioon that mcore is booted to come from devicetree/firmware somehow.
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