Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
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>
CC:     Serge Semin <Sergey.Semin@baikalelectronics.ru>,
        Serge Semin <fancer.lancer@gmail.com>,
        Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Manu Gautam <mgautam@codeaurora.org>,
        Roger Quadros <rogerq@ti.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Kevin Hilman <khilman@baylibre.com>,
        <linux-usb@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
Subject: [PATCH 13/18] dt-bindings: usb: dwc3: Add Tx De-emphasis restrictions
Date:   Sun, 11 Oct 2020 01:41:16 +0300
Message-ID: <20201010224121.12672-14-Sergey.Semin@baikalelectronics.ru>
In-Reply-To: <20201010224121.12672-1-Sergey.Semin@baikalelectronics.ru>
References: <20201010224121.12672-1-Sergey.Semin@baikalelectronics.ru>
MIME-Version: 1.0
Content-Transfer-Encoding: 7BIT
Content-Type:   text/plain; charset=US-ASCII
Precedence: bulk

In accordance with the driver comments the PIPE3 de-emphasis can be tunned
to be either -6dB, or -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 values.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
---
 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 fe1b372fda80..36d4b8060d7c 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