linux-kernel - [PATCH 2/3] dt-bindings: tegra186-hsp: add type for shared mailboxes

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Date:   Thu, 14 Apr 2022 13:05:56 +0530
From:   Kartik <kkartik@...dia.com>
To:     <jassisinghbrar@...il.com>, <robh+dt@...nel.org>,
        <krzk+dt@...nel.org>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <kkartik@...dia.com>
Subject: [PATCH 2/3] dt-bindings: tegra186-hsp: add type for shared mailboxes

Tegra234 supports sending/receiving 32-bit and 128-bit data over
a shared mailbox. Based on the data size to be used, clients need
to specify the type of shared mailbox in the device tree.

Add a macro for 128-bit shared mailbox. Mailbox clients can use this
macro as a flag in device tree to enable 128-bit data support for a
shared mailbox.

Signed-off-by: Kartik <kkartik@...dia.com>
---
 .../devicetree/bindings/mailbox/nvidia,tegra186-hsp.yaml | 9 +++++++++
 include/dt-bindings/mailbox/tegra186-hsp.h               | 5 +++++
 2 files changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.yaml b/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.yaml
index 9f7a7296b57f..a3e87516d637 100644
--- a/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.yaml
+++ b/Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.yaml
@@ -26,6 +26,15 @@ description: |
   second cell is used to identify the mailbox that the client is going
   to use.
 
+  For shared mailboxes, the first cell composed of two fields:
+    - bits 15..8:
+        A bit mask of flags that further specifies the type of shared
+        mailbox to be used (based on the data size). If no flag is
+        specified then, 32-bit shared mailbox is used.
+    - bits 7..0:
+        Defines the type of the mailbox to be used. This field should be
+        TEGRA_HSP_MBOX_TYPE_SM for shared mailboxes.
+
   For doorbells, the second cell specifies the index of the doorbell to
   use.
 
diff --git a/include/dt-bindings/mailbox/tegra186-hsp.h b/include/dt-bindings/mailbox/tegra186-hsp.h
index 3bdec7a84d35..b9ccae2aa9e2 100644
--- a/include/dt-bindings/mailbox/tegra186-hsp.h
+++ b/include/dt-bindings/mailbox/tegra186-hsp.h
@@ -15,6 +15,11 @@
 #define TEGRA_HSP_MBOX_TYPE_SS 0x2
 #define TEGRA_HSP_MBOX_TYPE_AS 0x3
 
+/*
+ * These define the types of shared mailbox supported based on data size.
+ */
+#define TEGRA_HSP_MBOX_TYPE_SM_128BIT (1 << 8)
+
 /*
  * These defines represent the bit associated with the given master ID in the
  * doorbell registers.
-- 
2.17.1