On Fri, Jun 6, 2025 at 4:57 AM Peng Fan (OSS) <peng....@oss.nxp.com> wrote: > > From: Peng Fan <peng....@nxp.com> > > i.MX95 features a Cortex-M33 core, six Cortex-A55 cores, and > one Cortex-M7 core. The System Control Management Interface(SCMI) > firmware runs on the M33 core. The i.MX95 SCMI firmware named System > Manager(SM) includes vendor extension protocols, Logical Machine > Management(LMM) protocol and CPU protocol and etc. > > There are three cases for M7: > (1) M7 in a separate Logical Machine(LM) that Linux can't control it. > (2) M7 in a separate Logical Machine that Linux can control it using > LMM protocol > (3) M7 runs in same Logical Machine as A55, so Linux can control it > using CPU protocol > > So extend the driver to using LMM and CPU protocol to manage the M7 core. > - Add IMX_RPROC_SM to indicate the remote core runs on a SoC that > has System Manager. > - Compare linux LM ID(got using scmi_imx_lmm_info) and M7 LM ID(got > from DTB), if same, use CPU protocol to start/stop. Otherwise, use > LMM protocol to start/stop. > Whether using CPU or LMM protocol to start/stop, the M7 status > detection could use CPU protocol to detect started or not. So > in imx_rproc_detect_mode, use scmi_imx_cpu_started to check the > status of M7. > - For above case 1 and 2, Use SCMI_IMX_LMM_POWER_ON to detect whether > the M7 LM is under control of A55 LM. > > Current setup relies on pre-Linux software(U-Boot) to do > M7 TCM ECC initialization. In future, we could add the support in Linux > to decouple U-Boot and Linux. > > Signed-off-by: Peng Fan <peng....@nxp.com>
Reviewed-by: Daniel Baluta <daniel.bal...@nxp.com>
