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SubjectRe: [PATCH v2 2/8] drm/rockchip/dsi: add dual mipi channel support
From
Date
Hi,

Comment below.

On 09/26/2017 01:25 PM, Nickey Yang wrote:
> This patch add dual mipi channel support:
> 1.add definition of dsi1 register and grf operation.
> 2.dsi0 and dsi1 will work in master and slave mode
> when driving dual mipi panel.
>
<snip>

>
> @@ -1226,6 +1367,13 @@ static int rockchip_mipi_parse_dt(struct dw_mipi_dsi *dsi)
> .grf_switch_reg = RK3399_GRF_SOC_CON20,
> .grf_dsi0_mode = RK3399_GRF_DSI_MODE,
> .grf_dsi0_mode_reg = RK3399_GRF_SOC_CON22,
> + .grf_dsi1_mode = RK3399_GRF_DSI1_MODE,
> + .grf_dsi1_enable = RK3399_GRF_DSI1_ENABLE,
> + .grf_dsi1_mode_reg1 = RK3399_GRF_SOC_CON23,
> + .dsi1_basedir = RK3399_TXRX_BASEDIR,
> + .dsi1_masterslavez = RK3399_TXRX_MASTERSLAVEZ,
> + .dsi1_enableclk = RK3399_TXRX_ENABLECLK,
> + .grf_dsi1_mode_reg2 = RK3399_GRF_SOC_CON24,
> .flags = DW_MIPI_NEEDS_PHY_CFG_CLK | DW_MIPI_NEEDS_GRF_CLK,
> .max_data_lanes = 4,
> };
> @@ -1242,17 +1390,107 @@ static int rockchip_mipi_parse_dt(struct dw_mipi_dsi *dsi)
> };
> MODULE_DEVICE_TABLE(of, dw_mipi_dsi_dt_ids);
>
> +
> +static int rockchip_dsi_dual_channel_probe(struct dw_mipi_dsi *dsi)
> +{
> + struct device_node *np;
> + struct platform_device *secondary;
> +
> + np = of_parse_phandle(dsi->dev->of_node, "rockchip,dual-channel", 0);
> + if (np) {
> + secondary = of_find_device_by_node(np);
> + dsi->slave = platform_get_drvdata(secondary);
> + of_node_put(np);
> +
> + if (!dsi->slave)
> + return -EPROBE_DEFER;
> +
> + dsi->slave->master = dsi;

This is not a suitable DT binding. It doesn't really represent HW, it's more of
a configuration that allows 2 DSIs to work together.

You can use the of-graph bindings to figure out whether you are operating in dual
mode or not: If the output ports of both the DSIs are connected to the same DT
node (i.e, both DSIs driving the same bridge chip/panel), then you know that you
need to configure the DSIs in dual channel mode.

Thanks,
Archit

--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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