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From: Serge Semin <Sergey.Semin@baikalelectronics.ru>
To: Mathias Nyman <mathias.nyman@intel.com>, Felipe Balbi <balbi@kernel.org>, 
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Rob Herring
 <robh+dt@kernel.org>
Subject: [PATCH 12/20] dt-bindings: usb: dwc3: Add Tx De-emphasis restrictions
Date: Wed, 14 Oct 2020 13:13:54 +0300
Message-ID: <20201014101402.18271-13-Sergey.Semin@baikalelectronics.ru>
In-Reply-To: <20201014101402.18271-1-Sergey.Semin@baikalelectronics.ru>
References: <20201014101402.18271-1-Sergey.Semin@baikalelectronics.ru>
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Cc: devicetree@vger.kernel.org, linux-snps-arc@lists.infradead.org,
 linux-mips@vger.kernel.org, Neil Armstrong <narmstrong@baylibre.com>,
 Kevin Hilman <khilman@baylibre.com>,
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 Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
 Serge Semin <fancer.lancer@gmail.com>,
 Bjorn Andersson <bjorn.andersson@linaro.org>,
 Serge Semin <Sergey.Semin@baikalelectronics.ru>,
 Manu Gautam <mgautam@codeaurora.org>, Andy Gross <agross@kernel.org>,
 Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
 Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
 linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org,
 Roger Quadros <rogerq@ti.com>
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

In accordance with the driver comments the PIPE3 de-emphasis can be tuned
to be either -6dB, -2.5dB or disabled. Let's add the de-emphasis
property restriction so the DT schema would make sure the controller DT
node is equipped with correct value.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>

---

Changelog v2:
- Grammar fix: "s/tunned/tuned"
- Grammar fix: remove redundant "or" conjunction.
---
 Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index 2f746ac64e71..307affb669aa 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -145,6 +145,10 @@ properties:
       The value driven to the PHY is controlled by the LTSSM during USB3
       Compliance mode.
     $ref: /schemas/types.yaml#/definitions/uint8
+    enum:
+      - 0 # -6dB de-emphasis
+      - 1 # -3.5dB de-emphasis
+      - 2 # No de-emphasis
 
   snps,dis_u3_susphy_quirk:
     description: When set core will disable USB3 suspend phy
-- 
2.27.0