Hi Jacopo,
Thank you for the patch.
On Thursday, 19 April 2018 12:31:04 EEST Jacopo Mondi wrote:
> The THC63LVD1024 LVDS to RGB bridge supports two different LVDS mapping
> modes, selectable by means of an external pin.
>
> Add support for configurable LVDS input mapping modes, using the newly
> introduced support for bridge input image formats.
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> ---
> drivers/gpu/drm/bridge/thc63lvd1024.c | 41 +++++++++++++++++++++++++++++++++
> 1 file changed, 41 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/thc63lvd1024.c
> b/drivers/gpu/drm/bridge/thc63lvd1024.c index 48527f8..a3071a1 100644
> --- a/drivers/gpu/drm/bridge/thc63lvd1024.c
> +++ b/drivers/gpu/drm/bridge/thc63lvd1024.c
> @@ -10,9 +10,15 @@
> #include <drm/drm_panel.h>
>
> #include <linux/gpio/consumer.h>
> +#include <linux/of.h>
> #include <linux/of_graph.h>
> #include <linux/regulator/consumer.h>
>
> +enum thc63_lvds_mapping_mode {
> + THC63_LVDS_MAP_MODE2,
> + THC63_LVDS_MAP_MODE1,
> +};
> +
> enum thc63_ports {
> THC63_LVDS_IN0,
> THC63_LVDS_IN1,
> @@ -116,6 +122,37 @@ static int thc63_parse_dt(struct thc63_dev *thc63)
> return 0;
> }
>
> +static int thc63_set_bus_fmt(struct thc63_dev *thc63)
> +{
> + u32 bus_fmt;
> + u32 map;
> + int ret;
> +
> + ret = of_property_read_u32(thc63->dev->of_node, "thine,map", &map);
> + if (ret) {
> + dev_err(thc63->dev,
> + "Unable to parse property \"thine,map\": %d\n", ret);
> + return ret;
Given that the property is currently not defined, I think you should select a
default instead of returning an error to preserve backward compatibility. You
can print a warning message to get the DT updated, maybe something like
u32 map = 0;
...
ret = of_property_read_u32(thc63->dev->of_node, "thine,map", &map);
if (ret)
dev_warn(thc63->dev,
"Unable to parse thine,map property (%d), defaulting to 0\n",
ret);
> + }
> +
> + switch (map) {
> + case THC63_LVDS_MAP_MODE1:
> + bus_fmt = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA;
> + break;
> + case THC63_LVDS_MAP_MODE2:
> + bus_fmt = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG;
> + break;
> + default:
> + dev_err(thc63->dev,
> + "Invalid value for property \"thine,map\": %u\n", map);
> + return -EINVAL;
This is fin as invalid property values should be rejected.
> + }
> +
> + drm_bridge_set_bus_formats(&thc63->bridge, &bus_fmt, 1);
> +
> + return 0;
> +}
> +
> static int thc63_gpio_init(struct thc63_dev *thc63)
> {
> thc63->oe = devm_gpiod_get_optional(thc63->dev, "oe", GPIOD_OUT_LOW);
> @@ -166,6 +203,10 @@ static int thc63_probe(struct platform_device *pdev)
> if (ret)
> return ret;
>
> + ret = thc63_set_bus_fmt(thc63);
> + if (ret)
> + return ret;
> +
Or you could move the code to thc63_parse_dt() as you're parsing DT.
> thc63->bridge.driver_private = thc63;
> thc63->bridge.of_node = pdev->dev.of_node;
> thc63->bridge.funcs = &thc63_bridge_func;
--
Regards,
Laurent Pinchart
