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From: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
To: <linux-i2c@vger.kernel.org>, <devicetree@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>
Cc: <wsa@kernel.org>, <robh+dt@kernel.org>,
	<ludovic.desroches@microchip.com>, <nicolas.ferre@microchip.com>,
	<alexandre.belloni@bootlin.com>, <linux@armlinux.org.uk>,
	<kamel.bouhara@bootlin.com>,
	Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Subject: [RFC PATCH 3/4] i2c: core: treat EPROBE_DEFER when acquiring SCL/SDA GPIOs
Date: Fri, 19 Jun 2020 17:19:03 +0300
Message-ID: <20200619141904.910889-4-codrin.ciubotariu@microchip.com> (raw)
In-Reply-To: <20200619141904.910889-1-codrin.ciubotariu@microchip.com>

Even if I2C bus GPIO recovery is optional, devm_gpiod_get() can return
-EPROBE_DEFER, so we should at least treat that. This ends up with
i2c_register_adapter() to be able to return -EPROBE_DEFER.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
---
 drivers/i2c/i2c-core-base.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 4ee29fec4e93..f8d9f2048ca8 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -368,15 +368,16 @@ static int i2c_gpio_init_recovery(struct i2c_adapter *adap)
 	return i2c_gpio_init_generic_recovery(adap);
 }
 
-static void i2c_init_recovery(struct i2c_adapter *adap)
+static int i2c_init_recovery(struct i2c_adapter *adap)
 {
 	struct i2c_bus_recovery_info *bri = adap->bus_recovery_info;
 	char *err_str;
 
 	if (!bri)
-		return;
+		return 0;
 
-	i2c_gpio_init_recovery(adap);
+	if (i2c_gpio_init_recovery(adap) == -EPROBE_DEFER)
+		return -EPROBE_DEFER;
 
 	if (!bri->recover_bus) {
 		err_str = "no recover_bus() found";
@@ -392,7 +393,7 @@ static void i2c_init_recovery(struct i2c_adapter *adap)
 			if (gpiod_get_direction(bri->sda_gpiod) == 0)
 				bri->set_sda = set_sda_gpio_value;
 		}
-		return;
+		return 0;
 	}
 
 	if (bri->recover_bus == i2c_generic_scl_recovery) {
@@ -407,10 +408,12 @@ static void i2c_init_recovery(struct i2c_adapter *adap)
 		}
 	}
 
-	return;
+	return 0;
  err:
 	dev_err(&adap->dev, "Not using recovery: %s\n", err_str);
 	adap->bus_recovery_info = NULL;
+
+	return 0;
 }
 
 static int i2c_smbus_host_notify_to_irq(const struct i2c_client *client)
@@ -1476,7 +1479,9 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
 			 "Failed to create compatibility class link\n");
 #endif
 
-	i2c_init_recovery(adap);
+	res = i2c_init_recovery(adap);
+	if (res == -EPROBE_DEFER)
+		goto out_link;
 
 	/* create pre-declared device nodes */
 	of_i2c_register_devices(adap);
@@ -1493,6 +1498,11 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
 
 	return 0;
 
+out_link:
+#ifdef CONFIG_I2C_COMPAT
+	class_compat_remove_link(i2c_adapter_compat_class, &adap->dev,
+				 adap->dev.parent);
+#endif
 out_reg:
 	init_completion(&adap->dev_released);
 	device_unregister(&adap->dev);
-- 
2.25.1


  parent reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-19 14:19 [RFC PATCH 0/4] i2c: core: add generic GPIO bus recovery Codrin Ciubotariu
2020-06-19 14:19 ` [RFC PATCH 1/4] dt-binding: i2c: add generic properties for " Codrin Ciubotariu
2020-07-05 21:19   ` Wolfram Sang
2020-07-24 19:39     ` Wolfram Sang
2020-07-24 20:52       ` Russell King - ARM Linux admin
2020-07-27 10:44         ` Codrin.Ciubotariu
2020-07-27 10:50           ` Russell King - ARM Linux admin
2020-07-30  9:00             ` Codrin.Ciubotariu
2020-08-03 14:16               ` Russell King - ARM Linux admin
2020-08-03 16:42                 ` Codrin.Ciubotariu
2020-07-15 19:21   ` Rob Herring
2020-06-19 14:19 ` [RFC PATCH 2/4] i2c: core: add generic I2C GPIO recovery Codrin Ciubotariu
2020-08-02 16:54   ` Wolfram Sang
2020-08-03 13:27     ` Codrin.Ciubotariu
2020-08-03 16:49       ` wsa
2020-06-19 14:19 ` Codrin Ciubotariu [this message]
2020-08-02 17:05   ` [RFC PATCH 3/4] i2c: core: treat EPROBE_DEFER when acquiring SCL/SDA GPIOs Wolfram Sang
2020-08-03 15:33     ` Codrin.Ciubotariu
2020-08-03 16:59       ` wsa
2020-06-19 14:19 ` [RFC PATCH 4/4] i2c: at91: Move to generic GPIO bus recovery Codrin Ciubotariu
2020-08-02 17:08   ` Wolfram Sang
2020-08-03 15:42     ` Codrin.Ciubotariu
2020-08-03 16:59       ` wsa
2020-08-26  6:14       ` Wolfram Sang
2020-09-04  8:55         ` Codrin.Ciubotariu
2020-09-04  9:20           ` Wolfram Sang
2020-07-05 21:09 ` [RFC PATCH 0/4] i2c: core: add " Wolfram Sang

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