Re: [PATCH] ARM: pxa: Add dummy backlight power supply on Mitac Mio A701

[Haojian Zhuang <haojian.zhuang@gmail.com>]

On 02/02/2014 01:55 AM, Robert Jarzmik wrote:
> Robert Jarzmik <robert.jarzmik@free.fr> writes:
>>> Hi Arnd,
>>>
>>> I cannot reach Haojian, and my platform is currently screen-broken without
>>> Thierry's patch (see [1] and [2]). I'm trying to have it since -rc6, with no luck.
> ... zip ...
>
> Hi Eric and Russell,
>
> Since more than a month I've been trying to have a fix applied in the PXA tree,
> since v3.13-rc6. I cannot reach Haojian, and Arnd seems unresponsive too.
>
> The history mails are in [1], the patch in [2].
>
> Your are the 2 other maintainers of the PXA tree, Could you please help me ?
>
> Cheers.
>
> --
> Robert
>
> [1]
> http://lists.infradead.org/pipermail/linux-arm-kernel/2014-January/223116.html
>
>
> [2]
> http://lists.infradead.org/pipermail/linux-arm-kernel/2013-December/221013.html
>
> ---8>---
>
> From: Thierry Reding <thierry.reding@gmail.com>
> Subject: [PATCH] ARM: pxa: Add dummy backlight power supply on Mitac Mio A701
> To: Haojian Zhuang <haojian.zhuang@gmail.com>, Robert Jarzmik <robert.jarzmik@free.fr>
> Cc: linux-pwm@vger.kernel.org, linux-arm-kernel@lists.infradead.org
> Date: Fri, 20 Dec 2013 10:46:52 +0100 (6 weeks, 1 day, 8 hours ago)
> Message-Id: <1387532812-11742-1-git-send-email-thierry.reding@gmail.com>
> X-Mailer: git-send-email 1.8.4.2
>
> Recent changes to the pwm-backlight driver have made the power supply
> mandatory. There is code in the regulator core to deal with situations
> where no regulator is specified and provide a dummy, but that works on
> DT-based boards only.
>
> The situation can be remedied by adding a dummy regulator during board
> initialization.
>
> Tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
> ---
>   arch/arm/mach-pxa/mioa701.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
>
> diff --git a/arch/arm/mach-pxa/mioa701.c b/arch/arm/mach-pxa/mioa701.c
> index f70583fee59f..29997bde277d 100644
> --- a/arch/arm/mach-pxa/mioa701.c
> +++ b/arch/arm/mach-pxa/mioa701.c
> @@ -38,6 +38,7 @@
>   #include <linux/mtd/physmap.h>
>   #include <linux/usb/gpio_vbus.h>
>   #include <linux/reboot.h>
> +#include <linux/regulator/fixed.h>
>   #include <linux/regulator/max1586.h>
>   #include <linux/slab.h>
>   #include <linux/i2c/pxa-i2c.h>
> @@ -714,6 +715,10 @@ static struct gpio global_gpios[] = {
>   	{ GPIO56_MT9M111_nOE, GPIOF_OUT_INIT_LOW, "Camera nOE" },
>   };
>
> +static struct regulator_consumer_supply fixed_5v0_consumers[] = {
> +	REGULATOR_SUPPLY("power", "pwm-backlight"),
> +};
> +
>   static void __init mioa701_machine_init(void)
>   {
>   	int rc;
> @@ -753,6 +758,10 @@ static void __init mioa701_machine_init(void)
>   	pxa_set_i2c_info(&i2c_pdata);
>   	pxa27x_set_i2c_power_info(NULL);
>   	pxa_set_camera_info(&mioa701_pxacamera_platform_data);
> +
> +	regulator_register_always_on(0, "fixed-5.0V", fixed_5v0_consumers,
> +				     ARRAY_SIZE(fixed_5v0_consumers),
> +				     5000000);
>   }
>
>   static void mioa701_machine_exit(void)
>

Hi Robert,

Excuse me to response late. Now it's applied.

Regards
Haojian