[PATCH v7 07/13] arm: mach-k3: common: Helper for LPM meta data address from DT

[Kumar, Udit]

On 12/10/2025 7:39 PM, Markus Schneider-Pargmann (TI.com) wrote:
> Add a small helper that uses memory regions referenced by the R5
> devicetree node to calculate the LPM meta data address.
>
> Tested-by: Anshul Dalal <anshuld at ti.com>
> Reviewed-by: Kendall Willis <k-willis at ti.com>
> Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp at baylibre.com>
> ---
>   arch/arm/mach-k3/common.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
>   arch/arm/mach-k3/common.h |  1 +
>   2 files changed, 45 insertions(+)
>
> diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
> index ee56f0b86ce303e319cfcd2b0db3bade1540635b..f058e973d08e233a458892df86e6da22ba3852fe 100644
> --- a/arch/arm/mach-k3/common.c
> +++ b/arch/arm/mach-k3/common.c
> @@ -16,6 +16,8 @@
>   #include <linux/printk.h>
>   #include "common.h"
>   #include <dm.h>
> +#include <dm/of_access.h>
> +#include <dm/ofnode.h>
>   #include <remoteproc.h>
>   #include <asm/cache.h>
>   #include <linux/soc/ti/ti_sci_protocol.h>
> @@ -36,6 +38,7 @@
>   #include <wait_bit.h>
>   
>   #define CLKSTOP_TRANSITION_TIMEOUT_MS	10
> +#define K3_R5_MEMREGION_LPM_METADATA_OFFSET	0x108000
>   
>   #define PROC_BOOT_CTRL_FLAG_R5_CORE_HALT	0x00000001
>   #define PROC_BOOT_STATUS_FLAG_R5_WFI		0x00000002
> @@ -194,6 +197,43 @@ int __maybe_unused wkup_ctrl_remove_can_io_isolation_if_set(void)
>   }
>   
>   #if IS_ENABLED(CONFIG_K3_IODDR)
> +int wkup_r5f_am62_lpm_meta_data_addr(u64 *meta_data_addr)

looking at function name, looks to be am62 specific, then common.c is 
not right place for this function .


> +{
> +	struct ofnode_phandle_args memregion_phandle;
> +	ofnode memregion;
> +	ofnode wkup_bus;
> +	int ret;
> +
> +	wkup_bus = ofnode_path("/bus at f0000/bus at b00000");
> +	if (!ofnode_valid(wkup_bus)) {
> +		printf("Failed to find wkup bus\n");
> +		return -EINVAL;
> +	}
> +
> +	memregion = ofnode_by_compatible(wkup_bus, "ti,am62-r5f");
> +	if (!ofnode_valid(memregion)) {
> +		printf("Failed to find r5f devicetree node ti,am62-r5f\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = ofnode_parse_phandle_with_args(memregion, "memory-region", NULL,
> [..]