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ARM: tegra: Add dummy backlight power supplies

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The Medcom Wide and PAZ00 boards don't specify the power supply for the
backlight, which means that the Linux driver will provide a dummy one.
Wire up an explicit dummy to also make the DT schema validation succeed.

Unfortunately I don't have access to the schematics for the Medcom Wide,
so I don't know if a more accurate description is possible.

The AC100 (PAZ00) schematics from here:

	https://www.s-manuals.com/pdf/motherboard/compal/compal_la-6352p_r1.0a_schematics.pdf

aren't entirely clear which one of the supplies powers backlight, but
the panel supply is probably close enough.

Based on work by David Heidelberg <david@ixit.cz>.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2021-12-07 13:59:59 +01:00
parent e1808b09df
commit c98167bbe8
2 changed files with 6 additions and 0 deletions
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3
arch/arm/boot/dts/tegra20-medcom-wide.dts
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@ -54,6 +54,9 @@
brightness-levels = <0 4 8 16 32 64 128 255>;
default-brightness-level = <6>;
/* close enough */
power-supply = <&vdd_3v3_reg>;
};
panel: panel {

3
arch/arm/boot/dts/tegra20-paz00.dts
View File

@ -571,6 +571,9 @@
brightness-levels = <0 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240 255>;
default-brightness-level = <10>;
/* close enough */
power-supply = <&vdd_pnl_reg>;
};
clk32k_in: clock-32k {