[PATCH v5 1/2] dt-bindings: mmc: Extend keep-power-in-suspend beyond SDIO

[Kamal Dasu <kamal.dasu@broadcom.com>]

keep-power-in-suspend already documents exactly the requirement
needed on (e)MMC platforms where firmware accesses the card directly
during resume. Rather than add a separate property describing the
same contract, drop its "SDIO only" restriction and document the
(e)MMC use case alongside the existing SDIO one.

Signed-off-by: Kamal Dasu <kamal.dasu@broadcom.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
---
Changes in v5:
  - Added Krzysztof's Reviewed-by.

Changes in v4:
  - Dropped no-mmc-poweroff-suspend entirely and extended
    keep-power-in-suspend instead, per Krzysztof: the two properties
    described the same "don't power off across suspend/resume"
    contract.

Changes in v3:
  - Renamed from no-mmc-sleep; dropped S_A_TIMEOUT framing per Ulf.

Changes in v2:
  - New patch, replacing v1's card-level quirk, per Ulf.

 Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml
index 3d7195e9461c..f4663b318435 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml
+++ b/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml
@@ -291,7 +291,12 @@ properties:
   keep-power-in-suspend:
     $ref: /schemas/types.yaml#/definitions/flag
     description:
-      SDIO only. Preserves card power during a suspend/resume cycle.
+      Preserves card power during a suspend/resume cycle. For SDIO,
+      this is a request an individual function driver can make at
+      runtime via sdio_set_host_pm_flags(). For (e)MMC, it is instead
+      a fixed platform characteristic, needed on boards where firmware
+      accesses the card directly during system resume, before the
+      kernel's own resume path runs.
 
   wakeup-source:
     $ref: /schemas/types.yaml#/definitions/flag
-- 
2.34.1