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Date: Sun, 16 Oct 2011 22:55:37 +0800
From: Shawn Guo <shawn.guo@...escale.com>
To: Rajendra Nayak <rnayak@...com>
CC: <broonie@...nsource.wolfsonmicro.com>, <grant.likely@...retlab.ca>,
<patches@...aro.org>, <tony@...mide.com>,
<devicetree-discuss@...ts.ozlabs.org>,
<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
<lrg@...com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 3/5] regulator: helper routine to extract
regulator_init_data
On Mon, Oct 10, 2011 at 09:49:36PM +0530, Rajendra Nayak wrote:
> The helper routine is meant to be used by regulator drivers
> to extract the regulator_init_data structure from the data
> that is passed from device tree.
> 'consumer_supplies' which is part of regulator_init_data is not extracted
> as the regulator consumer mappings are passed through DT differently,
> implemented in subsequent patches.
> Similarly the regulator<-->parent/supply mapping is handled in
> subsequent patches.
>
> Also add documentation for regulator bindings to be used to pass
> regulator_init_data struct information from device tree.
>
> Signed-off-by: Rajendra Nayak <rnayak@...com>
> ---
> .../devicetree/bindings/regulator/regulator.txt | 44 +++++++++
> drivers/regulator/Kconfig | 8 ++
> drivers/regulator/Makefile | 1 +
> drivers/regulator/of_regulator.c | 93 ++++++++++++++++++++
> include/linux/regulator/of_regulator.h | 21 +++++
> 5 files changed, 167 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/regulator/regulator.txt
> create mode 100644 drivers/regulator/of_regulator.c
> create mode 100644 include/linux/regulator/of_regulator.h
>
> diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt b/Documentation/devicetree/bindings/regulator/regulator.txt
> new file mode 100644
> index 0000000..a623fdd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/regulator/regulator.txt
> @@ -0,0 +1,44 @@
> +Voltage/Current Regulators
> +
> +Optional properties:
> +- regulator-min-uV: smallest voltage consumers may set
> +- regulator-max-uV: largest voltage consumers may set
> +- regulator-uV-offset: Offset applied to voltages to compensate for voltage drops
> +- regulator-min-uA: smallest current consumers may set
> +- regulator-max-uA: largest current consumers may set
> +- regulator-change-voltage: boolean, Output voltage can be changed by software
> +- regulator-change-current: boolean, Output current can be chnaged by software
> +- regulator-change-mode: boolean, Operating mode can be changed by software
> +- regulator-change-status: boolean, Enable/Disable control for regulator exists
> +- regulator-change-drms: boolean, Dynamic regulator mode switching is enabled
> +- regulator-mode-fast: boolean, allow/set fast mode for the regulator
> +- regulator-mode-normal: boolean, allow/set normal mode for the regulator
> +- regulator-mode-idle: boolean, allow/set idle mode for the regulator
> +- regulator-mode-standby: boolean, allow/set standby mode for the regulator
> +- regulator-input-uV: Input voltage for regulator when supplied by another regulator
> +- regulator-always-on: boolean, regulator should never be disabled
> +- regulator-boot-on: bootloader/firmware enabled regulator
> +- <name>-supply: phandle to the parent supply/regulator node
> +
> +Example:
> +
> + xyzreg: regulator@0 {
> + regulator-min-uV = <1000000>;
> + regulator-max-uV = <2500000>;
> + regulator-mode-fast;
> + regulator-change-voltage;
> + regulator-always-on;
> + vin-supply = <&vin>;
> + };
> +
> +The same binding used by a regulator to reference its
> +supply can be used by any consumer to reference its
> +regulator/supply
> +
> +Example of a device node referencing a regulator node,
> +
> + devicenode: node@0x0 {
> + ...
> + ...
> + <name>-supply = <&xyzreg>;
> + };
> diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
> index c7fd2c0..981c92e 100644
> --- a/drivers/regulator/Kconfig
> +++ b/drivers/regulator/Kconfig
> @@ -64,6 +64,14 @@ config REGULATOR_USERSPACE_CONSUMER
>
> If unsure, say no.
>
> +config OF_REGULATOR
> + tristate "OF regulator helpers"
> + depends on OF
> + default y if OF
> + help
> + OpenFirmware regulator framework helper routines that can
> + used by regulator drivers to extract data from device tree.
> +
> config REGULATOR_BQ24022
> tristate "TI bq24022 Dual Input 1-Cell Li-Ion Charger IC"
> help
> diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
> index 040d5aa..e6bc009 100644
> --- a/drivers/regulator/Makefile
> +++ b/drivers/regulator/Makefile
> @@ -7,6 +7,7 @@ obj-$(CONFIG_REGULATOR) += core.o dummy.o
> obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o
> obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o
> obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o
> +obj-$(CONFIG_OF_REGULATOR) += of_regulator.o
>
> obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o
> obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o
> diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
> new file mode 100644
> index 0000000..9262d06
> --- /dev/null
> +++ b/drivers/regulator/of_regulator.c
> @@ -0,0 +1,93 @@
> +/*
> + * OF helpers for regulator framework
> + *
> + * Copyright (C) 2011 Texas Instruments, Inc.
> + * Rajendra Nayak <rnayak@...com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/slab.h>
> +#include <linux/of.h>
> +#include <linux/regulator/machine.h>
> +
> +static void of_get_regulation_constraints(struct device_node *np,
> + struct regulator_init_data **init_data)
> +{
> + const __be32 *min_uV, *max_uV, *uV_offset;
> + const __be32 *min_uA, *max_uA, *input_uV;
> + unsigned int valid_modes_mask = 0, valid_ops_mask = 0;
> +
> + min_uV = of_get_property(np, "regulator-min-uV", NULL);
> + if (min_uV)
> + (*init_data)->constraints.min_uV = be32_to_cpu(*min_uV);
> + max_uV = of_get_property(np, "regulator-max-uV", NULL);
> + if (max_uV)
> + (*init_data)->constraints.max_uV = be32_to_cpu(*max_uV);
> + uV_offset = of_get_property(np, "regulator-uV-offset", NULL);
> + if (uV_offset)
> + (*init_data)->constraints.uV_offset = be32_to_cpu(*uV_offset);
> + min_uA = of_get_property(np, "regulator-min-uA", NULL);
> + if (min_uA)
> + (*init_data)->constraints.min_uA = be32_to_cpu(*min_uA);
> + max_uA = of_get_property(np, "regulator-max-uA", NULL);
> + if (max_uA)
> + (*init_data)->constraints.max_uA = be32_to_cpu(*max_uA);
> + input_uV = of_get_property(np, "regulator-input-uV", NULL);
> + if (input_uV)
> + (*init_data)->constraints.input_uV = be32_to_cpu(*input_uV);
> +
> + /* valid modes mask */
> + if (of_find_property(np, "regulator-mode-fast", NULL))
> + valid_modes_mask |= REGULATOR_MODE_FAST;
> + if (of_find_property(np, "regulator-mode-normal", NULL))
> + valid_modes_mask |= REGULATOR_MODE_NORMAL;
> + if (of_find_property(np, "regulator-mode-idle", NULL))
> + valid_modes_mask |= REGULATOR_MODE_IDLE;
> + if (of_find_property(np, "regulator-mode-standby", NULL))
> + valid_modes_mask |= REGULATOR_MODE_STANDBY;
> +
> + /* valid ops mask */
> + if (of_find_property(np, "regulator-change-voltage", NULL))
> + valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
> + if (of_find_property(np, "regulator-change-current", NULL))
> + valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
> + if (of_find_property(np, "regulator-change-mode", NULL))
> + valid_ops_mask |= REGULATOR_CHANGE_MODE;
> + if (of_find_property(np, "regulator-change-status", NULL))
> + valid_ops_mask |= REGULATOR_CHANGE_STATUS;
> +
> + (*init_data)->constraints.valid_modes_mask = valid_modes_mask;
> + (*init_data)->constraints.valid_ops_mask = valid_ops_mask;
> +
> + if (of_find_property(np, "regulator-always-on", NULL))
> + (*init_data)->constraints.always_on = true;
> + if (of_find_property(np, "regulator-boot-on", NULL))
> + (*init_data)->constraints.boot_on = true;
> +}
> +
I do not see that of_get_regulation_constraints() covers the following
fields. We do not support them for DT probe?
struct regulation_constraints {
char *name;
...
/* regulator suspend states for global PMIC STANDBY/HIBERNATE */
struct regulator_state state_disk;
struct regulator_state state_mem;
struct regulator_state state_standby;
suspend_state_t initial_state; /* suspend state to set at init */
/* mode to set on startup */
unsigned int initial_mode;
/* constraint flags */
...
unsigned apply_uV:1; /* apply uV constraint if min == max */
};
--
Regards,
Shawn
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