[PATCH 1/3] dt-bindings: mmc: mmci: add a property to disable DMA LLI

Yann Gautier
2022-03-04T13:53:46Z

On STMicroelectronics variant of PL18x, the DMA Linked Lists are supported
starting from revision v2 of the peripheral. But it has limitations,
as all the buffers should be aligned on block size (except the last one).
But this cannot be guaranteed with SDIO. We should then have a property
to disable the support of LLI.

Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
---
Documentation/devicetree/bindings/mmc/arm,pl18x.yaml | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml b/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml
index 1e69a5a42439..309a2c0426e5 100644
--- a/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml
+++ b/Documentation/devicetree/bindings/mmc/arm,pl18x.yaml
@@ -145,6 +145,11 @@ properties:
driver to sample the receive data (for example with a voltage switch
transceiver).

+ st,disable-dma-lli:
+ $ref: /schemas/types.yaml#/definitions/flag
+ description: ST Micro-specific property, disable DMA linked lists.
+ It is used for SDIO.
+
st,cmd-gpios:
maxItems: 1
description:
--
2.25.1