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From:   Sebastian Reichel <sebastian.reichel@collabora.com>
To:     Heiko Stuebner <heiko@sntech.de>, Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Lee Jones <lee@kernel.org>
Cc:     Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Mark Brown <broonie@kernel.org>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Alessandro Zummo <a.zummo@towertech.it>,
        linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Sebastian Reichel <sebastian.reichel@collabora.com>,
        kernel@collabora.com
Subject: [PATCHv2 01/13] mfd: rk808: convert to device managed resources
Date:   Thu,  8 Sep 2022 02:30:55 +0200
Message-Id: <20220908003107.220143-2-sebastian.reichel@collabora.com>
In-Reply-To: <20220908003107.220143-1-sebastian.reichel@collabora.com>
References: <20220908003107.220143-1-sebastian.reichel@collabora.com>
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Fully convert the driver to device managed resources.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/mfd/rk808.c | 66 +++++++++++++++------------------------------
 1 file changed, 22 insertions(+), 44 deletions(-)

diff --git a/drivers/mfd/rk808.c b/drivers/mfd/rk808.c
index 4142b638e5fa..c17fea1d48ca 100644
--- a/drivers/mfd/rk808.c
+++ b/drivers/mfd/rk808.c
@@ -527,13 +527,11 @@ static const struct regmap_irq_chip rk818_irq_chip = {
 	.init_ack_masked = true,
 };
 
-static struct i2c_client *rk808_i2c_client;
-
-static void rk808_pm_power_off(void)
+static int rk808_power_off(struct sys_off_data *data)
 {
+	struct rk808 *rk808 = data->cb_data;
 	int ret;
 	unsigned int reg, bit;
-	struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
 
 	switch (rk808->variant) {
 	case RK805_ID:
@@ -554,16 +552,18 @@ static void rk808_pm_power_off(void)
 		bit = DEV_OFF;
 		break;
 	default:
-		return;
+		return NOTIFY_DONE;
 	}
 	ret = regmap_update_bits(rk808->regmap, reg, bit, bit);
 	if (ret)
-		dev_err(&rk808_i2c_client->dev, "Failed to shutdown device!\n");
+		dev_err(&rk808->i2c->dev, "Failed to shutdown device!\n");
+
+	return NOTIFY_DONE;
 }
 
-static int rk808_restart_notify(struct notifier_block *this, unsigned long mode, void *cmd)
+static int rk808_restart(struct sys_off_data *data)
 {
-	struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
+	struct rk808 *rk808 = data->cb_data;
 	unsigned int reg, bit;
 	int ret;
 
@@ -579,16 +579,11 @@ static int rk808_restart_notify(struct notifier_block *this, unsigned long mode,
 	}
 	ret = regmap_update_bits(rk808->regmap, reg, bit, bit);
 	if (ret)
-		dev_err(&rk808_i2c_client->dev, "Failed to restart device!\n");
+		dev_err(&rk808->i2c->dev, "Failed to restart device!\n");
 
 	return NOTIFY_DONE;
 }
 
-static struct notifier_block rk808_restart_handler = {
-	.notifier_call = rk808_restart_notify,
-	.priority = 192,
-};
-
 static void rk8xx_shutdown(struct i2c_client *client)
 {
 	struct rk808 *rk808 = i2c_get_clientdata(client);
@@ -725,9 +720,9 @@ static int rk808_probe(struct i2c_client *client,
 		return -EINVAL;
 	}
 
-	ret = regmap_add_irq_chip(rk808->regmap, client->irq,
-				  IRQF_ONESHOT, -1,
-				  rk808->regmap_irq_chip, &rk808->irq_data);
+	ret = devm_regmap_add_irq_chip(&client->dev, rk808->regmap, client->irq,
+				       IRQF_ONESHOT, -1,
+				       rk808->regmap_irq_chip, &rk808->irq_data);
 	if (ret) {
 		dev_err(&client->dev, "Failed to add irq_chip %d\n", ret);
 		return ret;
@@ -751,17 +746,23 @@ static int rk808_probe(struct i2c_client *client,
 			      regmap_irq_get_domain(rk808->irq_data));
 	if (ret) {
 		dev_err(&client->dev, "failed to add MFD devices %d\n", ret);
-		goto err_irq;
+		return ret;
 	}
 
 	if (of_property_read_bool(np, "rockchip,system-power-controller")) {
-		rk808_i2c_client = client;
-		pm_power_off = rk808_pm_power_off;
+		ret = devm_register_sys_off_handler(&client->dev,
+				    SYS_OFF_MODE_POWER_OFF_PREPARE, SYS_OFF_PRIO_HIGH,
+				    &rk808_power_off, rk808);
+		if (ret)
+			return dev_err_probe(&client->dev, ret,
+					     "failed to register poweroff handler\n");
 
 		switch (rk808->variant) {
 		case RK809_ID:
 		case RK817_ID:
-			ret = register_restart_handler(&rk808_restart_handler);
+			ret = devm_register_sys_off_handler(&client->dev,
+							    SYS_OFF_MODE_RESTART, SYS_OFF_PRIO_HIGH,
+							    &rk808_restart, rk808);
 			if (ret)
 				dev_warn(&client->dev, "failed to register rst handler, %d\n", ret);
 			break;
@@ -771,28 +772,6 @@ static int rk808_probe(struct i2c_client *client,
 		}
 	}
 
-	return 0;
-
-err_irq:
-	regmap_del_irq_chip(client->irq, rk808->irq_data);
-	return ret;
-}
-
-static int rk808_remove(struct i2c_client *client)
-{
-	struct rk808 *rk808 = i2c_get_clientdata(client);
-
-	regmap_del_irq_chip(client->irq, rk808->irq_data);
-
-	/**
-	 * pm_power_off may points to a function from another module.
-	 * Check if the pointer is set by us and only then overwrite it.
-	 */
-	if (pm_power_off == rk808_pm_power_off)
-		pm_power_off = NULL;
-
-	unregister_restart_handler(&rk808_restart_handler);
-
 	return 0;
 }
 
@@ -850,7 +829,6 @@ static struct i2c_driver rk808_i2c_driver = {
 		.pm = &rk8xx_pm_ops,
 	},
 	.probe    = rk808_probe,
-	.remove   = rk808_remove,
 	.shutdown = rk8xx_shutdown,
 };
 
-- 
2.35.1