linux-kernel - [PATCH v2 2/4] dt-bindings: add bus number property

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Date:   Tue,  5 Oct 2021 16:37:46 +0200
From:   Paweł Anikiel <pan@...ihalf.com>
To:     jarkko.nikula@...ux.intel.com, andriy.shevchenko@...ux.intel.com,
        mika.westerberg@...ux.intel.com, robh+dt@...nel.org,
        p.zabel@...gutronix.de, arnd@...db.de, olof@...om.net,
        soc@...nel.org, dinguyen@...nel.org, p.yadav@...com,
        Tudor.Ambarus@...rochip.com
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        alexandre.belloni@...tlin.com, sre@...nel.org,
        thunder.leizhen@...wei.com, Jonathan.Cameron@...wei.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        ka@...ihalf.com, tn@...ihalf.com, jam@...ihalf.com,
        amstan@...gle.com,
        Paweł Anikiel <pan@...ihalf.com>
Subject: [PATCH v2 2/4] dt-bindings: add bus number property

On SoCFPGA systems, it's desireable to have fixed numbering for
i2c busses, while being able to enable/disable them (e.g. have i2c1
be mapped to /dev/i2c-1, even though i2c0 is disabled). This can also
be achieved using devicetree aliases (see i2c_add_adapter). However,
having the driver be self-contained without relying on aliases is more
robust.

Signed-off-by: Paweł Anikiel <pan@...ihalf.com>
---
 .../devicetree/bindings/i2c/snps,designware-i2c.yaml         | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml b/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml
index d9293c57f573..1e02ddcbd690 100644
--- a/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml
+++ b/Documentation/devicetree/bindings/i2c/snps,designware-i2c.yaml
@@ -93,6 +93,11 @@ properties:
       - const: tx
       - const: rx
 
+  busno:
+    description: |
+      The property should contain the desired bus number (as opposed to
+      being assigned automatically)
+
 unevaluatedProperties: false
 
 required:
-- 
2.25.1