On 4/30/26 10:43 AM, Richard Genoud (TI) wrote: > From: "Thomas Richard (TI)" <[email protected]> > > Add the capability to detect a resume. This overrides the weak > function j7xx_board_is_resuming(void). > To detect the resume, SPL searches a magic value (0xBA) in a register > of PMICA. > This value is set by DM-Firmware during the suspend sequence. > > Signed-off-by: Thomas Richard (TI) <[email protected]> > Co-developed-by: Gregory CLEMENT (TI) <[email protected]> > Signed-off-by: Gregory CLEMENT (TI) <[email protected]> > Co-developed-by: Richard Genoud (TI) <[email protected]> > Signed-off-by: Richard Genoud (TI) <[email protected]> > --- > board/ti/common/k3-lpm.h | 17 +++++++++++++++++ > board/ti/j721e/evm.c | 37 +++++++++++++++++++++++++++++++++++++ > 2 files changed, 54 insertions(+) > create mode 100644 board/ti/common/k3-lpm.h > > diff --git a/board/ti/common/k3-lpm.h b/board/ti/common/k3-lpm.h > new file mode 100644 > index 000000000000..a2141a0c25a8 > --- /dev/null > +++ b/board/ti/common/k3-lpm.h > @@ -0,0 +1,17 @@ > +/* SPDX-License-Identifier: GPL-2.0+ */ > +/* > + * Copyright (C) 2026, Texas Instruments Incorporated - https://www.ti.com/ > + * Copyright (C) 2026, Bootlin > + */ > + > +#ifndef __K3_LPM_H > +#define __K3_LPM_H > + > +/* Magic value in PMIC register to indicate the suspend state (SOC_OFF) */ > +#define K3_LPM_MAGIC_SUSPEND 0xba > + > +/* PMIC register where the magic value resides */ > +#define K3_LPM_SCRATCH_PAD_REG 0xcb
K3_LPM_SCRATCH_PAD_REG_3 so we easily know it is scratchpad reg 3. We currently use the entire SCRATCH_PAD_REG_3 register to mark a resume. Some PMICs in certain configurations use some scratchpad registers for other purposes, so we could consider using only a specific bit range (or even a single bit) and document it. This would free up the remaining bits for other uses. However, an 8-bit magic value is likely more robust against accidental user modification. No strong opinion, just raising the topic for discussion. Best Regards, Thomas
