[PATCH v4 00/13] am62: IO+DDR resume support

[Tom Rini]

On Thu, Oct 30, 2025 at 10:59:18AM +0100, Markus Schneider-Pargmann (TI.com) wrote:

> Hi,
> 
> this series introduces support to resume from IO+DDR. IO+DDR is a low
> power mode of am62a and am62p in which nearly everything is powered off
> except DDR which is in self-refresh and a few pins which detect
> activity and can wakeup the system again.
> 
> On resume uboot SPL is loaded and checks if this is a IO+DDR resume. If
> it is, the DDR initialization sequence in k3-ddrss differs slightly as
> it has to get the DDR out of the self-refresh.
> 
> Afterward a specific address determined from DT is used to get the
> metadata that stores relevant context addresses. The context is restored
> using the tisci message TI_SCI_MSG_MIN_CONTEXT_RESTORE. At the end all
> further initializations are skipped and uboot SPL directly jumps into
> the DM resume address which takes care of the rest.
> 
> k3-ddrss is using absolute register accesses at the moment. I am trying
> to submit syscon DT patches upstream to access these through syscon,
> unfortunately there is ongoing discussion regarding syscon.
> 
> I tested this on am62a.

Please make sure this builds without warnings (enable CONFIG_WERROR):
+(am62px_evm_r5) arch/arm/mach-k3/common.c: In function 'lpm_resume_from_ddr':
+(am62px_evm_r5) arch/arm/mach-k3/common.c:252:42: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
+(am62px_evm_r5)   252 |         struct lpm_meta_data lpm_data = *(struct lpm_meta_data *)meta_data_addr;
+(am62px_evm_r5)       |                                          ^
+(am62px_evm_r5) arch/arm/mach-k3/common.c:263:45: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
+(am62px_evm_r5)   263 |         image_entry = (image_entry_noargs_t)(u64 *)lpm_data.dm_jump_address;
+(am62px_evm_r5)       |                                             ^
+(am62px_evm_r5) cc1: all warnings being treated as errors

Thanks!

-- 
Tom
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