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From:   Pratyush Yadav <p.yadav@ti.com>
To:     Maxime Ripard <mripard@kernel.org>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
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        Vinod Koul <vkoul@kernel.org>,
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        Steve Longerbeam <slongerbeam@gmail.com>,
        Benoit Parrot <bparrot@ti.com>, <linux-media@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-phy@lists.infradead.org>, <dmaengine@vger.kernel.org>
CC:     Vignesh Raghavendra <vigneshr@ti.com>,
        Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>,
        Chunfeng Yun <chunfeng.yun@mediatek.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Subject: [PATCH v2 01/18] phy: Distinguish between Rx and Tx for MIPI D-PHY with submodes
Date:   Wed, 26 May 2021 20:52:51 +0530
Message-ID: <20210526152308.16525-2-p.yadav@ti.com>
In-Reply-To: <20210526152308.16525-1-p.yadav@ti.com>
References: <20210526152308.16525-1-p.yadav@ti.com>
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From: Paul Kocialkowski <paul.kocialkowski@bootlin.com>

As some D-PHY controllers support both Rx and Tx mode, we need a way for
users to explicitly request one or the other. For instance, Rx mode can
be used along with MIPI CSI-2 while Tx mode can be used with MIPI DSI.

Introduce new MIPI D-PHY PHY submodes to use with PHY_MODE_MIPI_DPHY.
The default (zero value) is kept to Tx so only the rkisp1 driver, which
uses D-PHY in Rx mode, needs to be adapted.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---

(no changes since v1)

 include/linux/phy/phy-mipi-dphy.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/phy/phy-mipi-dphy.h b/include/linux/phy/phy-mipi-dphy.h
index a877ffee845d..0f57ef46a8b5 100644
--- a/include/linux/phy/phy-mipi-dphy.h
+++ b/include/linux/phy/phy-mipi-dphy.h
@@ -6,6 +6,19 @@
 #ifndef __PHY_MIPI_DPHY_H_
 #define __PHY_MIPI_DPHY_H_
 
+/**
+ * enum phy_mipi_dphy_submode - MIPI D-PHY sub-mode
+ *
+ * A MIPI D-PHY can be used to transmit or receive data.
+ * Since some controllers can support both, the direction to enable is specified
+ * with the PHY sub-mode. Transmit is assumed by default with phy_set_mode.
+ */
+
+enum phy_mipi_dphy_submode {
+	PHY_MIPI_DPHY_SUBMODE_TX = 0,
+	PHY_MIPI_DPHY_SUBMODE_RX,
+};
+
 /**
  * struct phy_configure_opts_mipi_dphy - MIPI D-PHY configuration set
  *
-- 
2.30.0