linux-kernel - [PATCH v6 1/3] dt-bindings: mmc: mtk-sd: extend interrupts and pinctrls properties

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Message-ID: <20220316060014.12732-2-axe.yang@mediatek.com>
Date:   Wed, 16 Mar 2022 14:00:12 +0800
From:   Axe Yang <axe.yang@...iatek.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>
CC:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Satya Tangirala <satyat@...gle.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Axe Yang <axe.yang@...iatek.com>, Lucas Stach <dev@...xeye.de>,
        Eric Biggers <ebiggers@...gle.com>,
        Andrew Jeffery <andrew@...id.au>,
        Stephen Boyd <swboyd@...omium.org>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        Yue Hu <huyue2@...ong.com>, Tian Tao <tiantao6@...ilicon.com>,
        <angelogioacchino.delregno@...labora.com>,
        <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: [PATCH v6 1/3] dt-bindings: mmc: mtk-sd: extend interrupts and pinctrls properties

Extend interrupts and pinctrls for SDIO wakeup interrupt feature.
This feature allow SDIO devices alarm asynchronous interrupt to host
even when host stop providing clock to SDIO card. An extra wakeup
interrupt and pinctrl states for SDIO DAT1 pin state switching are
required in this scenario.

Signed-off-by: Axe Yang <axe.yang@...iatek.com>
---
 .../devicetree/bindings/mmc/mtk-sd.yaml       | 24 ++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
index 297ada03e3de..fb66b042c32f 100644
--- a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
+++ b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
@@ -69,12 +69,24 @@ properties:
       - const: ahb_cg
 
   interrupts:
-    maxItems: 1
+    description:
+      Should at least contain MSDC GIC interrupt. To support SDIO in-band wakeup, an extended
+      interrupt is required and be configured as wakeup source irq.
+    minItems: 1
+    maxItems: 2
 
   pinctrl-names:
+    description:
+      Should at least contain default and state_uhs. To support SDIO in-band wakeup, dat1 pin
+      will be switched between GPIO mode and SDIO DAT1 mode, state_eint and state_dat1 are
+      mandatory in this scenarios.
+    minItems: 2
+    maxItems: 4
     items:
       - const: default
       - const: state_uhs
+      - const: state_eint
+      - const: state_dat1
 
   pinctrl-0:
     description:
@@ -86,6 +98,16 @@ properties:
       should contain uhs mode pin ctrl.
     maxItems: 1
 
+  pinctrl-2:
+    description:
+      should switch dat1 pin to GPIO mode.
+    maxItems: 1
+
+  pinctrl-3:
+    description:
+      should switch SDIO dat1 pin from GPIO mode back to SDIO mode.
+    maxItems: 1
+
   assigned-clocks:
     description:
       PLL of the source clock.
-- 
2.25.1