Convert ld9040 panel driver to use restrack API.
As a result driver have following advantages:
- correctly handles removal of resources,
- do not need to defer probing, so as a result the panel
becomes available as soon as possible, in case of deferred
probing it was late_initcall,
- simplified initialization.
Signed-off-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
---
drivers/gpu/drm/panel/panel-ld9040.c | 41 ++++++++++++++++++------------------
1 file changed, 20 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/panel/panel-ld9040.c b/drivers/gpu/drm/panel/panel-ld9040.c
index 3337f30..619610e 100644
--- a/drivers/gpu/drm/panel/panel-ld9040.c
+++ b/drivers/gpu/drm/panel/panel-ld9040.c
@@ -17,6 +17,7 @@
#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
+#include <linux/restrack.h>
#include <video/mipi_display.h>
#include <video/of_videomode.h>
@@ -310,9 +311,22 @@ static int ld9040_parse_dt(struct ld9040 *ctx)
return 0;
}
+void ld9040_restrack_cb(struct device *dev, int ret)
+{
+ struct ld9040 *ctx = dev_get_drvdata(dev);
+
+ if (ret == 0)
+ drm_panel_add(&ctx->panel);
+ else if (ret == -EPROBE_DEFER)
+ drm_panel_remove(&ctx->panel);
+ else
+ dev_err(dev, "restrack error %d\n", ret);
+}
+
static int ld9040_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
+ struct restrack_ctx *rtrack;
struct ld9040 *ctx;
int ret;
@@ -331,17 +345,6 @@ static int ld9040_probe(struct spi_device *spi)
ctx->supplies[0].supply = "vdd3";
ctx->supplies[1].supply = "vci";
- ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
- ctx->supplies);
- if (ret < 0)
- return ret;
-
- ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
- if (IS_ERR(ctx->reset_gpio)) {
- dev_err(dev, "cannot get reset-gpios %ld\n",
- PTR_ERR(ctx->reset_gpio));
- return PTR_ERR(ctx->reset_gpio);
- }
spi->bits_per_word = 9;
ret = spi_setup(spi);
@@ -354,16 +357,13 @@ static int ld9040_probe(struct spi_device *spi)
ctx->panel.dev = dev;
ctx->panel.funcs = &ld9040_drm_funcs;
- return drm_panel_add(&ctx->panel);
-}
-
-static int ld9040_remove(struct spi_device *spi)
-{
- struct ld9040 *ctx = spi_get_drvdata(spi);
-
- drm_panel_remove(&ctx->panel);
+ rtrack = devm_restrack_register(ctx->dev, ld9040_restrack_cb,
+ regulator_bulk_restrack_desc(&ctx->supplies[0]),
+ regulator_bulk_restrack_desc(&ctx->supplies[1]),
+ gpiod_restrack_desc(&ctx->reset_gpio, "reset", GPIOD_OUT_HIGH),
+ );
- return 0;
+ return PTR_ERR_OR_ZERO(rtrack);
}
static struct of_device_id ld9040_of_match[] = {
@@ -374,7 +374,6 @@ MODULE_DEVICE_TABLE(of, ld9040_of_match);
static struct spi_driver ld9040_driver = {
.probe = ld9040_probe,
- .remove = ld9040_remove,
.driver = {
.name = "ld9040",
.owner = THIS_MODULE,
--
1.9.1
--
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