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Message-ID: <20230705174550.GC106478@ravnborg.org>
Date: Wed, 5 Jul 2023 19:45:50 +0200
From: Sam Ravnborg <sam@...nborg.org>
To: Paul Cercueil <paul@...pouillou.net>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Alim Akhtar <alim.akhtar@...sung.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 2/3] drm/panel: ld9040: Register a backlight device
Hi Paul,
On Mon, Jul 03, 2023 at 11:47:14PM +0200, Paul Cercueil wrote:
> Register a backlight device to be able to switch between all the gamma
> levels.
>
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
> drivers/gpu/drm/panel/panel-samsung-ld9040.c | 40 ++++++++++++++++++++
> 1 file changed, 40 insertions(+)
>
> diff --git a/drivers/gpu/drm/panel/panel-samsung-ld9040.c b/drivers/gpu/drm/panel/panel-samsung-ld9040.c
> index 7fd9444b42c5..b4f87d6244cb 100644
> --- a/drivers/gpu/drm/panel/panel-samsung-ld9040.c
> +++ b/drivers/gpu/drm/panel/panel-samsung-ld9040.c
> @@ -8,6 +8,7 @@
> * Andrzej Hajda <a.hajda@...sung.com>
> */
>
> +#include <linux/backlight.h>
> #include <linux/delay.h>
> #include <linux/gpio/consumer.h>
> #include <linux/module.h>
> @@ -311,8 +312,40 @@ static int ld9040_parse_dt(struct ld9040 *ctx)
> return 0;
> }
>
> +static int ld9040_bl_update_status(struct backlight_device *dev)
> +{
> + struct ld9040 *ctx = dev_get_drvdata(&dev->dev);
There is also the helper bl_get_data() - that do the same.
Sam
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