linux-kernel - [PATCH 2/2] devicetree: phy: rockchip-emmc add output-tapdelay-select

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Message-Id: <20201202082507.3536-3-chris.ruehl@gtsys.com.hk>
Date:   Wed,  2 Dec 2020 16:25:07 +0800
From:   Chris Ruehl <chris.ruehl@...ys.com.hk>
To:     unlisted-recipients:; (no To-header on input)
Cc:     devicetree@...r.kernel.org, Chris Ruehl <chris.ruehl@...ys.com.hk>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: [PATCH 2/2] devicetree: phy: rockchip-emmc add output-tapdelay-select

Update the rockchip-emmc-phy.txt and add the u32 property
'output-tapdelay-select'. This allow to set the otapdlysec register.

Tested with our customized rk3399 board to tune eMMC.

Signed-off-by: Chris Ruehl <chris.ruehl@...ys.com.hk>
---
 Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
index 3e4d2d79a65d..00aa2d349e55 100644
--- a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
+++ b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
@@ -18,6 +18,9 @@ Optional properties:
                         If not set, the default value of 50 will be applied.
  - enable-strobe-pulldown: Enable internal pull-down for the strobe line.
                            If not set, pull-down is not used.
+ - output-tapdelay-select: Specifies the phyctrl_otapdlysec register.
+                           If not set, the register defaults to 0x4.
+                           Maximum value 0xf.
 
 Example:
 
-- 
2.20.1