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

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Message-ID: <20220304135134.47827-2-yann.gautier@foss.st.com>
Date:   Fri, 4 Mar 2022 14:51:32 +0100
From:   Yann Gautier <yann.gautier@...s.st.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Christophe Kerello <christophe.kerello@...s.st.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Ludovic Barre <ludovic.barre@...s.st.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Russell King <linux@...linux.org.uk>,
        Marek Vasut <marex@...x.de>, <kernel@...electronics.com>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Grzegorz Szymaszek <gszymaszek@...rt.pl>,
        Yann Gautier <yann.gautier@...s.st.com>
Subject: [PATCH 1/3] dt-bindings: mmc: mmci: add a property to disable DMA LLI

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@...s.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