[PATCH V2 04/12] drm: bridge: icn6211: Add DSI lane count DT property parsing

[Maxime Ripard]

On Thu, Feb 17, 2022 at 01:25:22AM +0100, Marek Vasut wrote:
> The driver currently hard-codes DSI lane count to two, however the chip
> is capable of operating in 1..4 DSI lanes mode. Parse 'data-lanes' DT
> property and program the result into DSI_CTRL register.
> 
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Jagan Teki <jagan at amarulasolutions.com>
> Cc: Maxime Ripard <maxime at cerno.tech>
> Cc: Robert Foss <robert.foss at linaro.org>
> Cc: Sam Ravnborg <sam at ravnborg.org>
> Cc: Thomas Zimmermann <tzimmermann at suse.de>
> To: dri-devel at lists.freedesktop.org
> ---
> V2: Rebase on next-20220214
> ---
>  drivers/gpu/drm/bridge/chipone-icn6211.c | 21 ++++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/chipone-icn6211.c b/drivers/gpu/drm/bridge/chipone-icn6211.c
> index 2ac8eb7e25f52..7c013a08c7b00 100644
> --- a/drivers/gpu/drm/bridge/chipone-icn6211.c
> +++ b/drivers/gpu/drm/bridge/chipone-icn6211.c
> @@ -136,10 +136,12 @@ struct chipone {
>  	struct drm_bridge bridge;
>  	struct drm_display_mode mode;
>  	struct drm_bridge *panel_bridge;
> +	struct device_node *host_node;
>  	struct gpio_desc *enable_gpio;
>  	struct regulator *vdd1;
>  	struct regulator *vdd2;
>  	struct regulator *vdd3;
> +	int dsi_lanes;
>  };
>  
>  static inline struct chipone *bridge_to_chipone(struct drm_bridge *bridge)
> @@ -212,6 +214,11 @@ static void chipone_atomic_enable(struct drm_bridge *bridge,
>  	/* dsi specific sequence */
>  	ICN6211_DSI(icn, SYNC_EVENT_DLY, 0x80);
>  	ICN6211_DSI(icn, HFP_MIN, hfp & 0xff);
> +
> +	/* DSI data lane count */
> +	ICN6211_DSI(icn, DSI_CTRL,
> +		    DSI_CTRL_UNKNOWN | DSI_CTRL_DSI_LANES(icn->dsi_lanes - 1));
> +
>  	ICN6211_DSI(icn, MIPI_PD_CK_LANE, 0xa0);
>  	ICN6211_DSI(icn, PLL_CTRL(12), 0xff);
>  
> @@ -314,6 +321,7 @@ static const struct drm_bridge_funcs chipone_bridge_funcs = {
>  static int chipone_parse_dt(struct chipone *icn)
>  {
>  	struct device *dev = icn->dev;
> +	struct device_node *endpoint;
>  	struct drm_panel *panel;
>  	int ret;
>  
> @@ -350,6 +358,16 @@ static int chipone_parse_dt(struct chipone *icn)
>  		return PTR_ERR(icn->enable_gpio);
>  	}
>  
> +	endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
> +	icn->dsi_lanes = of_property_count_u32_elems(endpoint, "data-lanes");

The binding must be amended to allow for the usage of data-lanes, and
you need to keep the previous value as default for older device trees

Maxime
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