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Date: Fri, 19 Jun 2020 18:29:19 +0200
From: Sebastian Reichel <sre@...nel.org>
To: Rob Herring <robh+dt@...nel.org>,
Emil Velikov <emil.velikov@...labora.com>
Cc: Linus Walleij <linus.walleij@...aro.org>,
Daniel Mack <daniel@...que.org>,
Haojian Zhuang <haojian.zhuang@...il.com>,
Robert Jarzmik <robert.jarzmik@...e.fr>,
Russell King <linux@...linux.org.uk>, linux-pm@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
kernel@...labora.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv2 2/6] power: supply: gpio-charger: Make gpios optional
Hi,
On Sat, Jun 06, 2020 at 12:43:59AM +0200, Sebastian Reichel wrote:
> While strongly recommended, not all devices have a gpio to
> detect if the charger is connected. This moves the 'gpios'
> from required to optional section.
>
> This also modifies error handling for the GPIO a bit: We
> no longer fallback to pdata, if a GPIO is specified using
> GPIO descriptor tables. This is a bit cleaner and does
> not have any real impact: There are only two mainline pdata
> users (arm/mach-sa1100/collie.c, arm/mach-pxa/tosa.c) and
> none of them specify the GPIO via gpiod descriptor tables.
> Once both have been converted the driver's support for
> specifying GPIOs numbers in pdata will be dropped.
>
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> ---
Thanks, queued.
-- Sebastian
> .../bindings/power/supply/gpio-charger.yaml | 7 +++-
> drivers/power/supply/gpio-charger.c | 38 ++++++++++++-------
> 2 files changed, 31 insertions(+), 14 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml b/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml
> index 78b167c62ab1..30eabbb14ef3 100644
> --- a/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml
> +++ b/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml
> @@ -41,7 +41,12 @@ properties:
>
> required:
> - compatible
> - - gpios
> +
> +anyOf:
> + - required:
> + - gpios
> + - required:
> + - charge-status-gpios
>
> additionalProperties: false
>
> diff --git a/drivers/power/supply/gpio-charger.c b/drivers/power/supply/gpio-charger.c
> index 1b959c7f8b0e..875735d50716 100644
> --- a/drivers/power/supply/gpio-charger.c
> +++ b/drivers/power/supply/gpio-charger.c
> @@ -112,9 +112,14 @@ static int gpio_charger_get_irq(struct device *dev, void *dev_id,
> return irq;
> }
>
> +/*
> + * The entries will be overwritten by driver's probe routine depending
> + * on the available features. This list ensures, that the array is big
> + * enough for all optional features.
> + */
> static enum power_supply_property gpio_charger_properties[] = {
> POWER_SUPPLY_PROP_ONLINE,
> - POWER_SUPPLY_PROP_STATUS /* Must always be last in the array. */
> + POWER_SUPPLY_PROP_STATUS,
> };
>
> static int gpio_charger_probe(struct platform_device *pdev)
> @@ -128,6 +133,7 @@ static int gpio_charger_probe(struct platform_device *pdev)
> int charge_status_irq;
> unsigned long flags;
> int ret;
> + int num_props = 0;
>
> if (!pdata && !dev->of_node) {
> dev_err(dev, "No platform data\n");
> @@ -142,13 +148,13 @@ static int gpio_charger_probe(struct platform_device *pdev)
> * This will fetch a GPIO descriptor from device tree, ACPI or
> * boardfile descriptor tables. It's good to try this first.
> */
> - gpio_charger->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN);
> + gpio_charger->gpiod = devm_gpiod_get_optional(dev, NULL, GPIOD_IN);
>
> /*
> - * If this fails and we're not using device tree, try the
> - * legacy platform data method.
> + * Fallback to legacy platform data method, if no GPIO is specified
> + * using boardfile descriptor tables.
> */
> - if (IS_ERR(gpio_charger->gpiod) && !dev->of_node) {
> + if (!gpio_charger->gpiod && pdata) {
> /* Non-DT: use legacy GPIO numbers */
> if (!gpio_is_valid(pdata->gpio)) {
> dev_err(dev, "Invalid gpio pin in pdata\n");
> @@ -173,17 +179,23 @@ static int gpio_charger_probe(struct platform_device *pdev)
> return PTR_ERR(gpio_charger->gpiod);
> }
>
> + if (gpio_charger->gpiod) {
> + gpio_charger_properties[num_props] = POWER_SUPPLY_PROP_ONLINE;
> + num_props++;
> + }
> +
> charge_status = devm_gpiod_get_optional(dev, "charge-status", GPIOD_IN);
> - gpio_charger->charge_status = charge_status;
> - if (IS_ERR(gpio_charger->charge_status))
> - return PTR_ERR(gpio_charger->charge_status);
> + if (IS_ERR(charge_status))
> + return PTR_ERR(charge_status);
> + if (charge_status) {
> + gpio_charger->charge_status = charge_status;
> + gpio_charger_properties[num_props] = POWER_SUPPLY_PROP_STATUS;
> + num_props++;
> + }
>
> charger_desc = &gpio_charger->charger_desc;
> charger_desc->properties = gpio_charger_properties;
> - charger_desc->num_properties = ARRAY_SIZE(gpio_charger_properties);
> - /* Remove POWER_SUPPLY_PROP_STATUS from the supported properties. */
> - if (!gpio_charger->charge_status)
> - charger_desc->num_properties -= 1;
> + charger_desc->num_properties = num_props;
> charger_desc->get_property = gpio_charger_get_property;
>
> psy_cfg.of_node = dev->of_node;
> @@ -269,6 +281,6 @@ static struct platform_driver gpio_charger_driver = {
> module_platform_driver(gpio_charger_driver);
>
> MODULE_AUTHOR("Lars-Peter Clausen <lars@...afoo.de>");
> -MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO");
> +MODULE_DESCRIPTION("Driver for chargers only communicating via GPIO(s)");
> MODULE_LICENSE("GPL");
> MODULE_ALIAS("platform:gpio-charger");
> --
> 2.26.2
>
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