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Date: Thu, 23 Apr 2009 20:13:45 +0100
From: Mark Brown <broonie@...ena.org.uk>
To: Robert Jarzmik <robert.jarzmik@...e.fr>
Cc: eric.miao@...vell.com, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.arm.linux.org.uk, philipp.zabel@...il.com,
lrg@...mlogic.co.uk
Subject: Re: Patch to add mioa701 glue for voltage regulation
On Thu, Apr 23, 2009 at 08:30:44PM +0200, Robert Jarzmik wrote:
> I have that patch which adds voltage regulation definitions to mioa701
> board. The trick is, this patch depends on two others :
> - one which will be merged through Mark's regulator tree.
> This one is mandatory as a compiling dependency exists through include files.
Not my regulator tree, Liam's regulator tree - (CCed, not deleting any
text for him).
> - one which will be merge through Eric pxa tree.
> This is the cpufreq one, and has a "very weak" dependency, as only the
> "vcc_core" name _is_ the dependency.
> I think the easiest way to solve the compiling dependency
> (include/linux/regulator.max1586.h) is to make that patch go through regulator
> tree as well for linux-next, even if it's arm machine specific, don't you ?
Either that or merge the regulator driver via Eric's tree - I'd expect
it's more likely that there would be collisions with other changes to
the ARM machine support than with the regulator API.
Another option would be to create a git branch with the regulator driver
in it which gets merged in by both Eric and Liam.
> >From 7d3f66dba8875567fd814ea67ed9b0645a4f5f70 Mon Sep 17 00:00:00 2001
> From: Robert Jarzmik <robert.jarzmik@...e.fr>
> Date: Mon, 20 Apr 2009 16:52:25 +0200
> Subject: [PATCH] mioa701: add Maxim 1586 voltage regulator
>
> On this board, the PXA272 CPU voltage VCC_CORE is provided
> by a Maxim 1586 voltage regulator. Use the regulator
> framework to provide VCC_CORE control. When cpufreq will be
> updated to ask for vcc_core, this will optimize power
> drained by the board.
>
> Signed-off-by: Robert Jarzmik <robert.jarzmik@...e.fr>
> ---
> arch/arm/mach-pxa/mioa701.c | 52 +++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 52 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-pxa/mioa701.c b/arch/arm/mach-pxa/mioa701.c
> index 204263d..facff90 100644
> --- a/arch/arm/mach-pxa/mioa701.c
> +++ b/arch/arm/mach-pxa/mioa701.c
> @@ -37,6 +37,7 @@
> #include <linux/wm97xx_batt.h>
> #include <linux/mtd/physmap.h>
> #include <linux/usb/gpio_vbus.h>
> +#include <linux/regulator/max1586.h>
>
> #include <asm/mach-types.h>
> #include <asm/mach/arch.h>
> @@ -716,6 +717,48 @@ static struct wm97xx_batt_info mioa701_battery_data = {
> };
>
> /*
> + * Voltage regulation
> + */
> +static struct regulator_consumer_supply max1586_consumers[] = {
> + {
> + .supply = "vcc_core",
> + }
> +};
> +
> +static struct regulator_init_data max1586_v3_info = {
> + .constraints = {
> + .name = "vcc_core range",
> + .min_uV = 1000000,
> + .max_uV = 1705000,
> + .always_on = 1,
> + .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,
> + },
> + .num_consumer_supplies = ARRAY_SIZE(max1586_consumers),
> + .consumer_supplies = max1586_consumers,
> +};
> +
> +static struct regulator_init_data max1586_v6_info = {
> + .constraints = {
> + .name = "vcc_usim range",
> + .min_uV = 1,
> + .max_uV = 3000000,
> + .always_on = 1,
> + .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,
> + },
This reflects the issue I mentioned with your regulator driver not
implementing enable and disable. This also makes the always_on
constraint look very suspicious - if something did set that then the
regulator would in fact go off which looks odd.
> + .num_consumer_supplies = 0,
> +};
> +
> +static struct max1586_subdev_data max1586_subdevs[] = {
> + { .name = "vcc_core", .id = MAX1586_V3,
> + .platform_data = &max1586_v3_info },
> +};
What about vcc_usim? I'd expect tools like sparse will complain about
it being unreference.
> +
> +static struct max1586_platform_data max1586_info = {
> + .subdevs = max1586_subdevs,
> + .num_subdevs = ARRAY_SIZE(max1586_subdevs),
> +};
> +
> +/*
> * Camera interface
> */
> struct pxacamera_platform_data mioa701_pxacamera_platform_data = {
> @@ -733,6 +776,13 @@ static struct i2c_board_info __initdata mioa701_i2c_devices[] = {
> },
> };
>
> +static struct i2c_board_info __initdata mioa701_pi2c_devices[] = {
> + {
> + I2C_BOARD_INFO("max1586", 0x14),
> + .platform_data = &max1586_info,
> + },
> +};
> +
> static struct soc_camera_link iclink = {
> .bus_id = 0, /* Match id in pxa27x_device_camera in device.c */
> .board_info = &mioa701_i2c_devices[0],
> @@ -827,7 +877,9 @@ static void __init mioa701_machine_init(void)
> platform_add_devices(devices, ARRAY_SIZE(devices));
> gsm_init();
>
> + i2c_register_board_info(1, ARRAY_AND_SIZE(mioa701_pi2c_devices));
> pxa_set_i2c_info(&i2c_pdata);
> + pxa27x_set_i2c_power_info(NULL);
> pxa_set_camera_info(&mioa701_pxacamera_platform_data);
> }
>
> --
> 1.6.2.1
>
>
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