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drm/meson: dw_hdmi: Add support for an optional external 5V regulator

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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@baylibre.com>
Tested-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1512561268-29806-4-git-send-email-narmstrong@baylibre.com
This commit is contained in:
Neil Armstrong 2017-12-06 12:54:27 +01:00
parent 133e8ee9a1
commit 161a803fe3
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/meson/meson_dw_hdmi.c
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@ -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)) {