[PATCH v6 1/9] dt-bindings: phy: Add PHY_DIRECTION_TX/RX definitions

[Jason Yang <jason98166@gmail.com>]

A MIPI D-PHY or C-PHY can be a transmitter or a receiver. Some PHY
blocks have one of each and can use them at the same time, so one PHY
node offers two PHYs. The existing cell, PHY_TYPE_DPHY or
PHY_TYPE_CPHY, selects the mode of the whole block, not one of the two
PHYs.

Add PHY_DIRECTION_TX and PHY_DIRECTION_RX for a cell that selects the
transmitter or the receiver. The first user is the Rockchip RK3588 MIPI
DC-PHY, where the transmitter serves a DSI host and the receiver a CSI-2
host.

Suggested-by: Michael Riesch <michael.riesch@collabora.com>
Link: https://lore.kernel.org/r/7425ac83-f6d8-4443-a26e-a47f9306aa24@collabora.com
Signed-off-by: Jason Yang <jason98166@gmail.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
---
 include/dt-bindings/phy/phy.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/dt-bindings/phy/phy.h b/include/dt-bindings/phy/phy.h
index 979b5dfd8353..9ead74d9a172 100644
--- a/include/dt-bindings/phy/phy.h
+++ b/include/dt-bindings/phy/phy.h
@@ -29,4 +29,7 @@
 #define PHY_POL_INVERT		1
 #define PHY_POL_AUTO		2
 
+#define PHY_DIRECTION_TX	0
+#define PHY_DIRECTION_RX	1
+
 #endif /* _DT_BINDINGS_PHY */

-- 
2.43.0