linux-kernel - [RFC PATCH 2/3] input: gpio-keys

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Date:   Thu, 27 Apr 2023 15:16:24 -0700
From:   Doug Berger <opendmb@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Gergo Koteles <soyer@....hu>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kees Cook <keescook@...omium.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Saravana Kannan <saravanak@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        Doug Berger <opendmb@...il.com>
Subject: [RFC PATCH 2/3] input: gpio-keys - add device links of children

Since the child nodes of gpio-keys are implemented by the
gpio-keys device driver, that driver should explicitly create
the appropriate device links to support proper device power
management and shutdown sequencing.

Fixes: f9aa460672c9 ("driver core: Refactor fw_devlink feature")
Signed-off-by: Doug Berger <opendmb@...il.com>
---
 drivers/input/keyboard/gpio_keys.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 0516c6279d8a..7a0dcfeb02dc 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -865,6 +865,7 @@ static int gpio_keys_probe(struct platform_device *pdev)
 
 	for (i = 0; i < pdata->nbuttons; i++) {
 		const struct gpio_keys_button *button = &pdata->buttons[i];
+		struct fwnode_link *link;
 
 		if (!dev_get_platdata(dev)) {
 			child = device_get_next_child_node(dev, child);
@@ -882,6 +883,12 @@ static int gpio_keys_probe(struct platform_device *pdev)
 			fwnode_handle_put(child);
 			return error;
 		}
+		if (child) {
+			list_for_each_entry(link, &child->suppliers, c_hook) {
+				device_link_add(dev, link->supplier->dev,
+						DL_FLAG_AUTOREMOVE_CONSUMER);
+			}
+		}
 
 		if (button->wakeup)
 			wakeup = 1;
-- 
2.34.1