linux-kernel - [PATCH 3/4] drm/meson: dw_hdmi: Add support for an optional external 5V regulator

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Date:   Tue, 17 Oct 2017 10:07:43 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     airlied@...ux.ie
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] drm/meson: dw_hdmi: Add support for an optional external 5V regulator

On reference boards and derivatives, the HDMI Logic is powered by an external
5V regulator.
This regulator was set by the Vendor U-Boot, add optional support for it.

Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/gpu/drm/meson/meson_dw_hdmi.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
index cef4144..17de3af 100644
--- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
@@ -23,6 +23,7 @@
 #include <linux/of_graph.h>
 #include <linux/reset.h>
 #include <linux/clk.h>
+#include <linux/regulator/consumer.h>
 
 #include <drm/drmP.h>
 #include <drm/drm_edid.h>
@@ -137,6 +138,7 @@ struct meson_dw_hdmi {
 	struct reset_control *hdmitx_phy;
 	struct clk *hdmi_pclk;
 	struct clk *venci_clk;
+	struct regulator *hdmi_supply;
 	u32 irq_stat;
 };
 #define encoder_to_meson_dw_hdmi(x) \
@@ -751,6 +753,17 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
 	dw_plat_data = &meson_dw_hdmi->dw_plat_data;
 	encoder = &meson_dw_hdmi->encoder;
 
+	meson_dw_hdmi->hdmi_supply = devm_regulator_get_optional(dev, "hdmi");
+	if (IS_ERR(meson_dw_hdmi->hdmi_supply)) {
+		if (PTR_ERR(meson_dw_hdmi->hdmi_supply) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+		meson_dw_hdmi->hdmi_supply = NULL;
+	} else {
+		ret = regulator_enable(meson_dw_hdmi->hdmi_supply);
+		if (ret)
+			return ret;
+	}
+
 	meson_dw_hdmi->hdmitx_apb = devm_reset_control_get_exclusive(dev,
 						"hdmitx_apb");
 	if (IS_ERR(meson_dw_hdmi->hdmitx_apb)) {
-- 
2.7.4