linux-kernel - [RFC PATCH 4/4] drm/rockchip: rgb: Add dphy connection to rgb output

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Date:   Sun,  2 Oct 2022 08:45:40 +0200
From:   Michael Trimarchi <michael@...rulasolutions.com>
To:     Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-amarula@...rulasolutions.com
Subject: [RFC PATCH 4/4] drm/rockchip: rgb: Add dphy connection to rgb output

Dispite the commit 1f0f015151727, the rgb output has an option
to allow to sent the output pin using the dsi/lvds/ttl logic.
The only way to do and stay on the same design is let the
rockchip_rgb block to grab the handle if it is present and
enable it. The present of this handle depends on dts configuration

I have a full working example with an hardware with mixed lines
on direct logic and using the phy, with the follow dts example:

panel: panel {
	compatible = "panel-dpi";
	...
	panel-timing {
		clock-frequency = <30000000>;
		...
	};

	port {
		panel_rgb_in: endpoint {
			remote-endpoint = <&vopb_out_rgb>;
		};
	};
};

&vopb_out {
        vopb_out_rgb: endpoint@2 {
                reg = <2>;
                remote-endpoint = <&panel_rgb_in>;
        };
};

&vopb {
        status = "okay";
        pinctrl-names = "default", "sleep";
        pinctrl-0 = <&lcdc_rgb_pins>;
        pinctrl-1 = <&lcdc_sleep_pins>;

        phys = <&dsi_dphy>;
        phy-names = "dphy";
};

Signed-off-by: Michael Trimarchi <michael@...rulasolutions.com>
---
 drivers/gpu/drm/rockchip/rockchip_rgb.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/rockchip_rgb.c b/drivers/gpu/drm/rockchip/rockchip_rgb.c
index 75eb7cca3d82..c725774a0f40 100644
--- a/drivers/gpu/drm/rockchip/rockchip_rgb.c
+++ b/drivers/gpu/drm/rockchip/rockchip_rgb.c
@@ -8,6 +8,7 @@
 #include <linux/component.h>
 #include <linux/media-bus-format.h>
 #include <linux/of_graph.h>
+#include <linux/phy/phy.h>
 
 #include <drm/display/drm_dp_helper.h>
 #include <drm/drm_atomic_helper.h>
@@ -30,6 +31,7 @@ struct rockchip_rgb {
 	struct drm_bridge *bridge;
 	struct drm_encoder encoder;
 	struct drm_connector connector;
+	struct phy *dphy;
 	int output_mode;
 };
 
@@ -168,6 +170,22 @@ struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
 		goto err_free_connector;
 	}
 
+	/* PHY */
+	rgb->dphy = devm_phy_get(dev, "dphy");
+	if (!IS_ERR(rgb->dphy)) {
+		ret = phy_init(rgb->dphy);
+		if (ret)
+			return ERR_PTR(ret);
+
+		ret = phy_set_mode(rgb->dphy, PHY_MODE_TTL);
+		if (ret)
+			return ERR_PTR(ret);
+
+		ret = phy_power_on(rgb->dphy);
+		if (ret)
+			return ERR_PTR(ret);
+	}
+
 	return rgb;
 
 err_free_connector:
-- 
2.34.1