At least the Rockchip variant of the dw_hdmi can have controllable power supplies
providing 1.0 and 1.8V. Therefore add the possibility for the generic bridge
driver to enable supplies provided by the hw-specific drivers.
Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx>
---
changes since v1:
- follow suggestion from Russell King to keep regulator handling local
to the rockchip implementation for the time being and only generalize
when a real second implementation needs regulator handling
.../devicetree/bindings/drm/bridge/dw_hdmi.txt | 5 ++++
drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 32 +++++++++++++++++++++-
2 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/drm/bridge/dw_hdmi.txt b/Documentation/devicetree/bindings/drm/bridge/dw_hdmi.txt
index a905c14..bb74640 100644
--- a/Documentation/devicetree/bindings/drm/bridge/dw_hdmi.txt
+++ b/Documentation/devicetree/bindings/drm/bridge/dw_hdmi.txt
@@ -22,6 +22,11 @@ Optional properties
- ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing
- clocks, clock-names: phandle to the HDMI CEC clock, name should be "cec"
+Optional supplies:
+rockchip,rk3288-dw-hdmi handles two optional power supplies:
+- avdd1v0-supply: 1.0V power supply
+- avdd1v8-supply: 1.8V power supply
+
Example:
hdmi: hdmi@0120000 {
compatible = "fsl,imx6q-hdmi";
diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index d236faa..647a240 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -11,6 +11,7 @@
#include <linux/platform_device.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
#include <drm/drm_of.h>
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
@@ -28,6 +29,9 @@ struct rockchip_hdmi {
struct device *dev;
struct regmap *regmap;
struct drm_encoder encoder;
+ struct regulator_bulk_data supplies[2];
+ int nsupplies;
+ bool supplies_enabled;
};
#define to_rockchip_hdmi(x) container_of(x, struct rockchip_hdmi, x)
@@ -179,6 +183,12 @@ static struct drm_encoder_funcs dw_hdmi_rockchip_encoder_funcs = {
static void dw_hdmi_rockchip_encoder_disable(struct drm_encoder *encoder)
{
+ struct rockchip_hdmi *hdmi = to_rockchip_hdmi(encoder);
+
+ if (hdmi->nsupplies > 0 && hdmi->supplies_enabled) {
+ regulator_bulk_disable(hdmi->nsupplies, hdmi->supplies);
+ hdmi->supplies_enabled = false;
+ }
}
static bool
@@ -199,7 +209,16 @@ static void dw_hdmi_rockchip_encoder_commit(struct drm_encoder *encoder)
{
struct rockchip_hdmi *hdmi = to_rockchip_hdmi(encoder);
u32 val;
- int mux;
+ int mux, ret;
+
+ if (hdmi->nsupplies > 0 && !hdmi->supplies_enabled) {
+ ret = regulator_bulk_enable(hdmi->nsupplies, hdmi->supplies);
+ if (ret) {
+ dev_err(hdmi->dev, "could not enable hdmi analog supplies\n");
+ return;
+ }
+ hdmi->supplies_enabled = true;
+ }
mux = rockchip_drm_encoder_get_mux_id(hdmi->dev->of_node, encoder);
if (mux)
@@ -275,6 +294,17 @@ static int dw_hdmi_rockchip_bind(struct device *dev, struct device *master,
if (!iores)
return -ENXIO;
+ hdmi->supplies[0].supply = "avdd1v0";
+ hdmi->supplies[1].supply = "avdd1v8";
+ hdmi->nsupplies = 2;
+
+ ret = devm_regulator_bulk_get(hdmi->dev,
+ hdmi->nsupplies, hdmi->supplies);
+ if (ret == -EPROBE_DEFER)
+ return ret;
+ if (ret)
+ hdmi->nsupplies = 0;
+
platform_set_drvdata(pdev, hdmi);
encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
--
2.1.4
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