linux-kernel - [PATCH 1/2] pinctrl: Allow to create link between controller and consumer

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Date:   Wed, 22 May 2019 17:29:24 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...com>
To:     <linus.walleij@...aro.org>, <alexandre.torgue@...com>,
        <amelie.delaunay@...com>
CC:     <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <benjamin.gaignard@...aro.org>,
        Benjamin Gaignard <benjamin.gaignard@...com>
Subject: [PATCH 1/2] pinctrl: Allow to create link between controller and consumer

Pin controller may want to create a link between itself and its clients
to be sure of suspend/resume call ordering.
Introduce create_link field in pinctrl_desc structure to let pinctrl core
knows that controller expect to create a link.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
---
 drivers/pinctrl/core.c          | 11 +++++++++++
 include/linux/pinctrl/pinctrl.h |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index c6ff4d5fa482..40b647f3dc7d 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -1216,6 +1216,15 @@ struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p,
 }
 EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
 
+static void pinctrl_link_add(struct pinctrl_dev *pctldev,
+			     struct device *consumer)
+{
+	if (pctldev->desc->create_link)
+		device_link_add(consumer, pctldev->dev,
+				DL_FLAG_PM_RUNTIME |
+				DL_FLAG_AUTOREMOVE_CONSUMER);
+}
+
 /**
  * pinctrl_commit_state() - select/activate/program a pinctrl state to HW
  * @p: the pinctrl handle for the device that requests configuration
@@ -1261,6 +1270,8 @@ static int pinctrl_commit_state(struct pinctrl *p, struct pinctrl_state *state)
 		if (ret < 0) {
 			goto unapply_new_state;
 		}
+
+		pinctrl_link_add(setting->pctldev, p->dev);
 	}
 
 	p->state = state;
diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h
index 8f5dbb84547a..11a42ccf4b0a 100644
--- a/include/linux/pinctrl/pinctrl.h
+++ b/include/linux/pinctrl/pinctrl.h
@@ -125,6 +125,7 @@ struct pinctrl_ops {
  *	the hardware description
  * @custom_conf_items: Information how to print @params in debugfs, must be
  *	the same size as the @custom_params, i.e. @num_custom_params
+ * @create_link: If true create a link between pinctrl and it consumer
  */
 struct pinctrl_desc {
 	const char *name;
@@ -139,6 +140,7 @@ struct pinctrl_desc {
 	const struct pinconf_generic_params *custom_params;
 	const struct pin_config_item *custom_conf_items;
 #endif
+	bool create_link;
 };
 
 /* External interface to pin controller */
-- 
2.15.0