On 04/10/2024 12:01, Andreas Kemnade wrote:
> Am Fri, 4 Oct 2024 10:38:22 +0300
> schrieb Roger Quadros <rogerq@xxxxxxxxxx>:
>
>> On 01/10/2024 00:30, Andreas Kemnade wrote:
>>> Wire up the regulators where usage is plausible. Do not
>>> wire them if purpose/usage is unclear like 5V for
>>> many things requiring lower voltages.
>>>
>>> Signed-off-by: Andreas Kemnade <andreas@xxxxxxxxxxxx>
>>> ---
>>> arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts | 11 ++++-------
>>> 1 file changed, 4 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts
>>> b/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts index
>>> d6b0abba19f6..cc1b6080bf95 100644 ---
>>> a/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts +++
>>> b/arch/arm/boot/dts/ti/omap/omap4-epson-embt2ws.dts @@ -20,13
>>> +20,13 @@ memory@80000000 { backlight-left {
>>> compatible = "pwm-backlight";
>>> pwms = <&twl_pwm 1 7812500>;
>>> - power-supply = <&unknown_supply>;
>>> + power-supply = <&lb_v50>;
>>
>> This is probably wrong. I noticed this while reviewing patch 3.
>>
>> you probably want to wire this to blc_l?
>>
> No idea was blc_l is. I did not find any code handling blc_l.
> looking at the vendor kernel:
>
> $ grep -R BLC_L_GPIO *
> arch/arm/mach-omap2/board-bt2ws.c:#define BLC_L_GPIO
> 16 /* LB LED GPIO */ arch/arm/mach-omap2/board-bt2ws.c:
> {BLC_L_GPIO, GPIOF_OUT_INIT_LOW, "gpio_blc_l" },
> arch/arm/mach-omap2/board-bt2ws.c: gpio_export(BLC_L_GPIO, 0);
> arch/arm/mach-omap2/board-bt2ts.c:#define BLC_L_GPIO
> 16 /* LB LED GPIO */ arch/arm/mach-omap2/board-bt2ts.c:
> {BLC_L_GPIO, GPIOF_OUT_INIT_LOW, "gpio_blc_l" },
> arch/arm/mach-omap2/board-bt2ts.c: gpio_export(BLC_L_GPIO, 0);
>
> These two gpios are exported. But they seem not to influence
> backlight in any way. I just tested again to make sure. Maybe it is just
> a leftover from earlier board revisions.
OK. you could then leave it as it is now.
>
>>> };
>>>
>>> backlight-right {
>>> compatible = "pwm-backlight";
>>> pwms = <&twl_pwm 0 7812500>;
>>> - power-supply = <&unknown_supply>;
>>> + power-supply = <&lb_v50>;
>>
>> this one should be wired to blc_r?
>>
> Same as with blc_l.
> $ grep -R BLC_R_GPIO *
> arch/arm/mach-omap2/board-bt2ws.c:#define BLC_R_GPIO
> 17 /* LB LED GPIO */ arch/arm/mach-omap2/board-bt2ws.c:
> {BLC_R_GPIO, GPIOF_OUT_INIT_LOW, "gpio_blc_r" },
> arch/arm/mach-omap2/board-bt2ws.c: gpio_export(BLC_R_GPIO, 0);
> arch/arm/mach-omap2/board-bt2ts.c:#define BLC_R_GPIO
> 17 /* LB LED GPIO */ arch/arm/mach-omap2/board-bt2ts.c:
> {BLC_R_GPIO, GPIOF_OUT_INIT_LOW, "gpio_blc_r" },
> arch/arm/mach-omap2/board-bt2ts.c: gpio_export(BLC_R_GPIO, 0);
>
> Regards,
> Andreas
--
cheers,
-roger
