[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH v4 1/3] xen/arm: Add imx8q{m,x} platform glue
Hi John, On 08/04/2024 18:11, John Ernberg wrote: > > > When using Linux for dom0 there are a bunch of drivers that need to do SMC > SIP calls into the firmware to enable certain hardware bits like the > watchdog. > > Provide a basic platform glue that implements the needed SMC forwarding. > > The format of these calls are as follows: > - reg 0: function ID > - reg 1: subfunction ID (when there's a subfunction) > remaining regs: args > > For now we only allow Dom0 to make these calls as they are all managing > hardware. There is no specification for these SIP calls, the IDs and names > have been extracted from the upstream linux kernel and the vendor kernel. > > Most of the SIP calls are only available for the iMX8M series of SoCs, so > they are easy to reject and they need to be revisited when iMX8M series > support is added. Stale paragraph. Should be removed given that the driver targets only Q{M,XP}. > > From the other calls we can reject CPUFREQ because Dom0 cannot make an > informed decision regarding CPU frequency scaling, WAKEUP_SRC is to wake > up from suspend, which Xen doesn't support at this time. > > This leaves the TIME SIP, OTP SIPs, BUILDINFO SIP and TEMP ALARM SIP, which > for now are allowed to Dom0. BUILDINFO, TEMP ALARM are leftovers from previous revision. > > NOTE: This code is based on code found in NXP Xen tree located here: > https://github.com/nxp-imx/imx-xen/blob/lf-5.10.y_4.13/xen/arch/arm/platforms/imx8qm.c > > Signed-off-by: Peng Fan <peng.fan@xxxxxxx> > [jernberg: Add SIP call filtering] > Signed-off-by: John Ernberg <john.ernberg@xxxxxxxx> Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx> The commit msg can be fixed on commit. ~Michal
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