drm/omap: panel-dsi-cm: add regulator support

Add support for regulators used by panels found inside
of the Nokia N950, N9 and Motorola Droid 4.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
index 905b717..b98ea9e 100644 (file)
--- a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
+++ b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
@@ -23,6 +23,7 @@
 #include <linux/workqueue.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
+#include <linux/regulator/consumer.h>
 
 #include <video/mipi_display.h>
 #include <video/of_display_timing.h>
@@ -60,6 +61,9 @@ struct panel_drv_data {
        int reset_gpio;
        int ext_te_gpio;
 
+       struct regulator *vpnl;
+       struct regulator *vddi;
+
        bool use_dsi_backlight;
 
        struct omap_dsi_pin_config pin_config;
@@ -590,25 +594,43 @@ static int dsicm_power_on(struct panel_drv_data *ddata)
                .lp_clk_max = 10000000,
        };
 
+       if (ddata->vpnl) {
+               r = regulator_enable(ddata->vpnl);
+               if (r) {
+                       dev_err(&ddata->pdev->dev,
+                               "failed to enable VPNL: %d\n", r);
+                       return r;
+               }
+       }
+
+       if (ddata->vddi) {
+               r = regulator_enable(ddata->vddi);
+               if (r) {
+                       dev_err(&ddata->pdev->dev,
+                               "failed to enable VDDI: %d\n", r);
+                       goto err_vpnl;
+               }
+       }
+
        if (ddata->pin_config.num_pins > 0) {
                r = in->ops.dsi->configure_pins(in, &ddata->pin_config);
                if (r) {
                        dev_err(&ddata->pdev->dev,
                                "failed to configure DSI pins\n");
-                       goto err0;
+                       goto err_vddi;
                }
        }
 
        r = in->ops.dsi->set_config(in, &dsi_config);
        if (r) {
                dev_err(&ddata->pdev->dev, "failed to configure DSI\n");
-               goto err0;
+               goto err_vddi;
        }
 
        r = in->ops.dsi->enable(in);
        if (r) {
                dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
-               goto err0;
+               goto err_vddi;
        }
 
        dsicm_hw_reset(ddata);
@@ -666,7 +688,13 @@ err:
        dsicm_hw_reset(ddata);
 
        in->ops.dsi->disable(in, true, false);
-err0:
+err_vddi:
+       if (ddata->vddi)
+               regulator_disable(ddata->vddi);
+err_vpnl:
+       if (ddata->vpnl)
+               regulator_disable(ddata->vpnl);
+
        return r;
 }
 
@@ -689,6 +717,11 @@ static void dsicm_power_off(struct panel_drv_data *ddata)
 
        in->ops.dsi->disable(in, true, false);
 
+       if (ddata->vddi)
+               regulator_disable(ddata->vddi);
+       if (ddata->vpnl)
+               regulator_disable(ddata->vpnl);
+
        ddata->enabled = 0;
 }
 
@@ -1189,6 +1222,22 @@ static int dsicm_probe_of(struct platform_device *pdev)
                return PTR_ERR(in);
        }
 
+       ddata->vpnl = devm_regulator_get_optional(&pdev->dev, "vpnl");
+       if (IS_ERR(ddata->vpnl)) {
+               err = PTR_ERR(ddata->vpnl);
+               if (err == -EPROBE_DEFER)
+                       return err;
+               ddata->vpnl = NULL;
+       }
+
+       ddata->vddi = devm_regulator_get_optional(&pdev->dev, "vddi");
+       if (IS_ERR(ddata->vddi)) {
+               err = PTR_ERR(ddata->vddi);
+               if (err == -EPROBE_DEFER)
+                       return err;
+               ddata->vddi = NULL;
+       }
+
        ddata->in = in;
 
        /* TODO: ulps, backlight */