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* [PATCH v4 0/2] i2c: stm32f7: add SMBus-Alert support
@ 2021-05-05 13:14 ` Alain Volmat
  0 siblings, 0 replies; 16+ messages in thread
From: Alain Volmat @ 2021-05-05 13:14 UTC (permalink / raw)
  To: wsa, robh+dt
  Cc: mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier, alain.volmat

This serie adds support for SMBus Alert on the STM32F7.
A new binding smbus-alert is added in order to differenciate
with the existing smbus binding.

SMBus-Alert is an optional SMBus feature and SMBA alert control
and status logic must be enabled along with SMBALERT# pin
configured via pinctrl in the device tree. This is the
rational for adding "smbus-alert" property.

---
v4:
add a new generic smbus-alert property instead of st,smbus-alert
update driver to use smbus-alert instead of st,smbus-alert

v3:
use lore.kernel.org links instead of marc.info

v2:
When SMBUS alert isn't available on the board (SMBA unused), this
logic musn't be enabled. Enabling it unconditionally wrongly lead to get
SMBA interrupts.
So, add "st,smbus-alert" dedicated binding to have a smbus alert with a
consistent pin configuration in DT.

Alain Volmat (2):
  i2c: add binding to mark a bus as supporting SMBus-Alert
  i2c: stm32f7: add SMBus-Alert support

 Documentation/devicetree/bindings/i2c/i2c.txt |  7 ++-
 drivers/i2c/busses/i2c-stm32f7.c              | 73 +++++++++++++++++++++++++++
 2 files changed, 78 insertions(+), 2 deletions(-)

-- 
2.7.4


^ permalink raw reply	[flat|nested] 16+ messages in thread

* [PATCH v4 0/2] i2c: stm32f7: add SMBus-Alert support
@ 2021-05-05 13:14 ` Alain Volmat
  0 siblings, 0 replies; 16+ messages in thread
From: Alain Volmat @ 2021-05-05 13:14 UTC (permalink / raw)
  To: wsa, robh+dt
  Cc: mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier, alain.volmat

This serie adds support for SMBus Alert on the STM32F7.
A new binding smbus-alert is added in order to differenciate
with the existing smbus binding.

SMBus-Alert is an optional SMBus feature and SMBA alert control
and status logic must be enabled along with SMBALERT# pin
configured via pinctrl in the device tree. This is the
rational for adding "smbus-alert" property.

---
v4:
add a new generic smbus-alert property instead of st,smbus-alert
update driver to use smbus-alert instead of st,smbus-alert

v3:
use lore.kernel.org links instead of marc.info

v2:
When SMBUS alert isn't available on the board (SMBA unused), this
logic musn't be enabled. Enabling it unconditionally wrongly lead to get
SMBA interrupts.
So, add "st,smbus-alert" dedicated binding to have a smbus alert with a
consistent pin configuration in DT.

Alain Volmat (2):
  i2c: add binding to mark a bus as supporting SMBus-Alert
  i2c: stm32f7: add SMBus-Alert support

 Documentation/devicetree/bindings/i2c/i2c.txt |  7 ++-
 drivers/i2c/busses/i2c-stm32f7.c              | 73 +++++++++++++++++++++++++++
 2 files changed, 78 insertions(+), 2 deletions(-)

-- 
2.7.4


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 16+ messages in thread

* [PATCH v4 1/2] i2c: add binding to mark a bus as supporting SMBus-Alert
  2021-05-05 13:14 ` Alain Volmat
@ 2021-05-05 13:14   ` Alain Volmat
  -1 siblings, 0 replies; 16+ messages in thread
From: Alain Volmat @ 2021-05-05 13:14 UTC (permalink / raw)
  To: wsa, robh+dt
  Cc: mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier, alain.volmat

Since SMBus-Alert is an optional feature of SMBUS which
requires an additional pin, the smbus binding cannot be
used to indicate its support.

Add an additional smbus-alert binding specific for it and
update the description text of smbus to avoid mentioning
SMBus-Alert

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
---
 Documentation/devicetree/bindings/i2c/i2c.txt | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt
index df41f72afc87..b864916e087f 100644
--- a/Documentation/devicetree/bindings/i2c/i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c.txt
@@ -89,8 +89,11 @@ wants to support one of the below features, it should adapt these bindings.
 
 - smbus
 	states that additional SMBus restrictions and features apply to this bus.
-	Examples of features are SMBusHostNotify and SMBusAlert. Examples of
-	restrictions are more reserved addresses and timeout definitions.
+	An example of feature is SMBusHostNotify. Examples of restrictions are
+	more reserved addresses and timeout definitions.
+
+- smbus-alert
+	states that the optional SMBus-Alert feature apply to this bus.
 
 Required properties (per child device)
 --------------------------------------
-- 
2.7.4


^ permalink raw reply related	[flat|nested] 16+ messages in thread

* [PATCH v4 1/2] i2c: add binding to mark a bus as supporting SMBus-Alert
@ 2021-05-05 13:14   ` Alain Volmat
  0 siblings, 0 replies; 16+ messages in thread
From: Alain Volmat @ 2021-05-05 13:14 UTC (permalink / raw)
  To: wsa, robh+dt
  Cc: mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier, alain.volmat

Since SMBus-Alert is an optional feature of SMBUS which
requires an additional pin, the smbus binding cannot be
used to indicate its support.

Add an additional smbus-alert binding specific for it and
update the description text of smbus to avoid mentioning
SMBus-Alert

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
---
 Documentation/devicetree/bindings/i2c/i2c.txt | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt
index df41f72afc87..b864916e087f 100644
--- a/Documentation/devicetree/bindings/i2c/i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c.txt
@@ -89,8 +89,11 @@ wants to support one of the below features, it should adapt these bindings.
 
 - smbus
 	states that additional SMBus restrictions and features apply to this bus.
-	Examples of features are SMBusHostNotify and SMBusAlert. Examples of
-	restrictions are more reserved addresses and timeout definitions.
+	An example of feature is SMBusHostNotify. Examples of restrictions are
+	more reserved addresses and timeout definitions.
+
+- smbus-alert
+	states that the optional SMBus-Alert feature apply to this bus.
 
 Required properties (per child device)
 --------------------------------------
-- 
2.7.4


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 16+ messages in thread

* [PATCH v4 2/2] i2c: stm32f7: add SMBus-Alert support
  2021-05-05 13:14 ` Alain Volmat
@ 2021-05-05 13:14   ` Alain Volmat
  -1 siblings, 0 replies; 16+ messages in thread
From: Alain Volmat @ 2021-05-05 13:14 UTC (permalink / raw)
  To: wsa, robh+dt
  Cc: mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier, alain.volmat

Add support for the SMBus-Alert protocol to the STM32F7 that has
dedicated control and status logic.

If SMBus-Alert is used, the SMBALERT# pin must be configured as alternate
function for I2C Alert.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
---
v4: - check for smbus-alert property
v2: - rely on st,smbus-alert binding instead of smbus
---
 drivers/i2c/busses/i2c-stm32f7.c | 73 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 0138317ea600..b9b19a2a2ffa 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -51,6 +51,7 @@
 
 /* STM32F7 I2C control 1 */
 #define STM32F7_I2C_CR1_PECEN			BIT(23)
+#define STM32F7_I2C_CR1_ALERTEN			BIT(22)
 #define STM32F7_I2C_CR1_SMBHEN			BIT(20)
 #define STM32F7_I2C_CR1_WUPEN			BIT(18)
 #define STM32F7_I2C_CR1_SBC			BIT(16)
@@ -125,6 +126,7 @@
 				(((n) & STM32F7_I2C_ISR_ADDCODE_MASK) >> 17)
 #define STM32F7_I2C_ISR_DIR			BIT(16)
 #define STM32F7_I2C_ISR_BUSY			BIT(15)
+#define STM32F7_I2C_ISR_ALERT			BIT(13)
 #define STM32F7_I2C_ISR_PECERR			BIT(11)
 #define STM32F7_I2C_ISR_ARLO			BIT(9)
 #define STM32F7_I2C_ISR_BERR			BIT(8)
@@ -138,6 +140,7 @@
 #define STM32F7_I2C_ISR_TXE			BIT(0)
 
 /* STM32F7 I2C Interrupt Clear */
+#define STM32F7_I2C_ICR_ALERTCF			BIT(13)
 #define STM32F7_I2C_ICR_PECCF			BIT(11)
 #define STM32F7_I2C_ICR_ARLOCF			BIT(9)
 #define STM32F7_I2C_ICR_BERRCF			BIT(8)
@@ -279,6 +282,17 @@ struct stm32f7_i2c_msg {
 };
 
 /**
+ * struct stm32f7_i2c_alert - SMBus alert specific data
+ * @setup: platform data for the smbus_alert i2c client
+ * @ara: I2C slave device used to respond to the SMBus Alert with Alert
+ * Response Address
+ */
+struct stm32f7_i2c_alert {
+	struct i2c_smbus_alert_setup setup;
+	struct i2c_client *ara;
+};
+
+/**
  * struct stm32f7_i2c_dev - private data of the controller
  * @adap: I2C adapter for this controller
  * @dev: device for this controller
@@ -310,6 +324,7 @@ struct stm32f7_i2c_msg {
  * @analog_filter: boolean to indicate enabling of the analog filter
  * @dnf_dt: value of digital filter requested via dt
  * @dnf: value of digital filter to apply
+ * @alert: SMBus alert specific data
  */
 struct stm32f7_i2c_dev {
 	struct i2c_adapter adap;
@@ -341,6 +356,7 @@ struct stm32f7_i2c_dev {
 	bool analog_filter;
 	u32 dnf_dt;
 	u32 dnf;
+	struct stm32f7_i2c_alert *alert;
 };
 
 /*
@@ -1624,6 +1640,13 @@ static irqreturn_t stm32f7_i2c_isr_error(int irq, void *data)
 		f7_msg->result = -EINVAL;
 	}
 
+	if (status & STM32F7_I2C_ISR_ALERT) {
+		dev_dbg(dev, "<%s>: SMBus alert received\n", __func__);
+		writel_relaxed(STM32F7_I2C_ICR_ALERTCF, base + STM32F7_I2C_ICR);
+		i2c_handle_smbus_alert(i2c_dev->alert->ara);
+		return IRQ_HANDLED;
+	}
+
 	if (!i2c_dev->slave_running) {
 		u32 mask;
 		/* Disable interrupts */
@@ -1990,6 +2013,42 @@ static void stm32f7_i2c_disable_smbus_host(struct stm32f7_i2c_dev *i2c_dev)
 	}
 }
 
+static int stm32f7_i2c_enable_smbus_alert(struct stm32f7_i2c_dev *i2c_dev)
+{
+	struct stm32f7_i2c_alert *alert;
+	struct i2c_adapter *adap = &i2c_dev->adap;
+	struct device *dev = i2c_dev->dev;
+	void __iomem *base = i2c_dev->base;
+
+	alert = devm_kzalloc(dev, sizeof(*alert), GFP_KERNEL);
+	if (!alert)
+		return -ENOMEM;
+
+	alert->ara = i2c_new_smbus_alert_device(adap, &alert->setup);
+	if (IS_ERR(alert->ara))
+		return PTR_ERR(alert->ara);
+
+	i2c_dev->alert = alert;
+
+	/* Enable SMBus Alert */
+	stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, STM32F7_I2C_CR1_ALERTEN);
+
+	return 0;
+}
+
+static void stm32f7_i2c_disable_smbus_alert(struct stm32f7_i2c_dev *i2c_dev)
+{
+	struct stm32f7_i2c_alert *alert = i2c_dev->alert;
+	void __iomem *base = i2c_dev->base;
+
+	if (alert) {
+		/* Disable SMBus Alert */
+		stm32f7_i2c_clr_bits(base + STM32F7_I2C_CR1,
+				     STM32F7_I2C_CR1_ALERTEN);
+		i2c_unregister_device(alert->ara);
+	}
+}
+
 static u32 stm32f7_i2c_func(struct i2c_adapter *adap)
 {
 	struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
@@ -2173,6 +2232,16 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 		}
 	}
 
+	if (of_property_read_bool(pdev->dev.of_node, "smbus-alert")) {
+		ret = stm32f7_i2c_enable_smbus_alert(i2c_dev);
+		if (ret) {
+			dev_err(i2c_dev->dev,
+				"failed to enable SMBus alert protocol (%d)\n",
+				ret);
+			goto i2c_disable_smbus_host;
+		}
+	}
+
 	dev_info(i2c_dev->dev, "STM32F7 I2C-%d bus adapter\n", adap->nr);
 
 	pm_runtime_mark_last_busy(i2c_dev->dev);
@@ -2180,6 +2249,9 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 
 	return 0;
 
+i2c_disable_smbus_host:
+	stm32f7_i2c_disable_smbus_host(i2c_dev);
+
 i2c_adapter_remove:
 	i2c_del_adapter(adap);
 
@@ -2214,6 +2286,7 @@ static int stm32f7_i2c_remove(struct platform_device *pdev)
 {
 	struct stm32f7_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
 
+	stm32f7_i2c_disable_smbus_alert(i2c_dev);
 	stm32f7_i2c_disable_smbus_host(i2c_dev);
 
 	i2c_del_adapter(&i2c_dev->adap);
-- 
2.7.4


^ permalink raw reply related	[flat|nested] 16+ messages in thread

* [PATCH v4 2/2] i2c: stm32f7: add SMBus-Alert support
@ 2021-05-05 13:14   ` Alain Volmat
  0 siblings, 0 replies; 16+ messages in thread
From: Alain Volmat @ 2021-05-05 13:14 UTC (permalink / raw)
  To: wsa, robh+dt
  Cc: mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier, alain.volmat

Add support for the SMBus-Alert protocol to the STM32F7 that has
dedicated control and status logic.

If SMBus-Alert is used, the SMBALERT# pin must be configured as alternate
function for I2C Alert.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
---
v4: - check for smbus-alert property
v2: - rely on st,smbus-alert binding instead of smbus
---
 drivers/i2c/busses/i2c-stm32f7.c | 73 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
index 0138317ea600..b9b19a2a2ffa 100644
--- a/drivers/i2c/busses/i2c-stm32f7.c
+++ b/drivers/i2c/busses/i2c-stm32f7.c
@@ -51,6 +51,7 @@
 
 /* STM32F7 I2C control 1 */
 #define STM32F7_I2C_CR1_PECEN			BIT(23)
+#define STM32F7_I2C_CR1_ALERTEN			BIT(22)
 #define STM32F7_I2C_CR1_SMBHEN			BIT(20)
 #define STM32F7_I2C_CR1_WUPEN			BIT(18)
 #define STM32F7_I2C_CR1_SBC			BIT(16)
@@ -125,6 +126,7 @@
 				(((n) & STM32F7_I2C_ISR_ADDCODE_MASK) >> 17)
 #define STM32F7_I2C_ISR_DIR			BIT(16)
 #define STM32F7_I2C_ISR_BUSY			BIT(15)
+#define STM32F7_I2C_ISR_ALERT			BIT(13)
 #define STM32F7_I2C_ISR_PECERR			BIT(11)
 #define STM32F7_I2C_ISR_ARLO			BIT(9)
 #define STM32F7_I2C_ISR_BERR			BIT(8)
@@ -138,6 +140,7 @@
 #define STM32F7_I2C_ISR_TXE			BIT(0)
 
 /* STM32F7 I2C Interrupt Clear */
+#define STM32F7_I2C_ICR_ALERTCF			BIT(13)
 #define STM32F7_I2C_ICR_PECCF			BIT(11)
 #define STM32F7_I2C_ICR_ARLOCF			BIT(9)
 #define STM32F7_I2C_ICR_BERRCF			BIT(8)
@@ -279,6 +282,17 @@ struct stm32f7_i2c_msg {
 };
 
 /**
+ * struct stm32f7_i2c_alert - SMBus alert specific data
+ * @setup: platform data for the smbus_alert i2c client
+ * @ara: I2C slave device used to respond to the SMBus Alert with Alert
+ * Response Address
+ */
+struct stm32f7_i2c_alert {
+	struct i2c_smbus_alert_setup setup;
+	struct i2c_client *ara;
+};
+
+/**
  * struct stm32f7_i2c_dev - private data of the controller
  * @adap: I2C adapter for this controller
  * @dev: device for this controller
@@ -310,6 +324,7 @@ struct stm32f7_i2c_msg {
  * @analog_filter: boolean to indicate enabling of the analog filter
  * @dnf_dt: value of digital filter requested via dt
  * @dnf: value of digital filter to apply
+ * @alert: SMBus alert specific data
  */
 struct stm32f7_i2c_dev {
 	struct i2c_adapter adap;
@@ -341,6 +356,7 @@ struct stm32f7_i2c_dev {
 	bool analog_filter;
 	u32 dnf_dt;
 	u32 dnf;
+	struct stm32f7_i2c_alert *alert;
 };
 
 /*
@@ -1624,6 +1640,13 @@ static irqreturn_t stm32f7_i2c_isr_error(int irq, void *data)
 		f7_msg->result = -EINVAL;
 	}
 
+	if (status & STM32F7_I2C_ISR_ALERT) {
+		dev_dbg(dev, "<%s>: SMBus alert received\n", __func__);
+		writel_relaxed(STM32F7_I2C_ICR_ALERTCF, base + STM32F7_I2C_ICR);
+		i2c_handle_smbus_alert(i2c_dev->alert->ara);
+		return IRQ_HANDLED;
+	}
+
 	if (!i2c_dev->slave_running) {
 		u32 mask;
 		/* Disable interrupts */
@@ -1990,6 +2013,42 @@ static void stm32f7_i2c_disable_smbus_host(struct stm32f7_i2c_dev *i2c_dev)
 	}
 }
 
+static int stm32f7_i2c_enable_smbus_alert(struct stm32f7_i2c_dev *i2c_dev)
+{
+	struct stm32f7_i2c_alert *alert;
+	struct i2c_adapter *adap = &i2c_dev->adap;
+	struct device *dev = i2c_dev->dev;
+	void __iomem *base = i2c_dev->base;
+
+	alert = devm_kzalloc(dev, sizeof(*alert), GFP_KERNEL);
+	if (!alert)
+		return -ENOMEM;
+
+	alert->ara = i2c_new_smbus_alert_device(adap, &alert->setup);
+	if (IS_ERR(alert->ara))
+		return PTR_ERR(alert->ara);
+
+	i2c_dev->alert = alert;
+
+	/* Enable SMBus Alert */
+	stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, STM32F7_I2C_CR1_ALERTEN);
+
+	return 0;
+}
+
+static void stm32f7_i2c_disable_smbus_alert(struct stm32f7_i2c_dev *i2c_dev)
+{
+	struct stm32f7_i2c_alert *alert = i2c_dev->alert;
+	void __iomem *base = i2c_dev->base;
+
+	if (alert) {
+		/* Disable SMBus Alert */
+		stm32f7_i2c_clr_bits(base + STM32F7_I2C_CR1,
+				     STM32F7_I2C_CR1_ALERTEN);
+		i2c_unregister_device(alert->ara);
+	}
+}
+
 static u32 stm32f7_i2c_func(struct i2c_adapter *adap)
 {
 	struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
@@ -2173,6 +2232,16 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 		}
 	}
 
+	if (of_property_read_bool(pdev->dev.of_node, "smbus-alert")) {
+		ret = stm32f7_i2c_enable_smbus_alert(i2c_dev);
+		if (ret) {
+			dev_err(i2c_dev->dev,
+				"failed to enable SMBus alert protocol (%d)\n",
+				ret);
+			goto i2c_disable_smbus_host;
+		}
+	}
+
 	dev_info(i2c_dev->dev, "STM32F7 I2C-%d bus adapter\n", adap->nr);
 
 	pm_runtime_mark_last_busy(i2c_dev->dev);
@@ -2180,6 +2249,9 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
 
 	return 0;
 
+i2c_disable_smbus_host:
+	stm32f7_i2c_disable_smbus_host(i2c_dev);
+
 i2c_adapter_remove:
 	i2c_del_adapter(adap);
 
@@ -2214,6 +2286,7 @@ static int stm32f7_i2c_remove(struct platform_device *pdev)
 {
 	struct stm32f7_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
 
+	stm32f7_i2c_disable_smbus_alert(i2c_dev);
 	stm32f7_i2c_disable_smbus_host(i2c_dev);
 
 	i2c_del_adapter(&i2c_dev->adap);
-- 
2.7.4


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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 16+ messages in thread

* Re: [PATCH v4 1/2] i2c: add binding to mark a bus as supporting SMBus-Alert
  2021-05-05 13:14   ` Alain Volmat
@ 2021-05-07  0:55     ` Rob Herring
  -1 siblings, 0 replies; 16+ messages in thread
From: Rob Herring @ 2021-05-07  0:55 UTC (permalink / raw)
  To: Alain Volmat
  Cc: wsa, mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier

On Wed, May 05, 2021 at 03:14:38PM +0200, Alain Volmat wrote:
> Since SMBus-Alert is an optional feature of SMBUS which
> requires an additional pin, the smbus binding cannot be
> used to indicate its support.
> 
> Add an additional smbus-alert binding specific for it and
> update the description text of smbus to avoid mentioning
> SMBus-Alert
> 
> Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
> ---
>  Documentation/devicetree/bindings/i2c/i2c.txt | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)

This needs to be added to i2c-bus.yaml too.

Acked-by: Rob Herring <robh@kernel.org>

> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt
> index df41f72afc87..b864916e087f 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c.txt
> @@ -89,8 +89,11 @@ wants to support one of the below features, it should adapt these bindings.
>  
>  - smbus
>  	states that additional SMBus restrictions and features apply to this bus.
> -	Examples of features are SMBusHostNotify and SMBusAlert. Examples of
> -	restrictions are more reserved addresses and timeout definitions.
> +	An example of feature is SMBusHostNotify. Examples of restrictions are
> +	more reserved addresses and timeout definitions.
> +
> +- smbus-alert
> +	states that the optional SMBus-Alert feature apply to this bus.
>  
>  Required properties (per child device)
>  --------------------------------------
> -- 
> 2.7.4
> 

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: [PATCH v4 1/2] i2c: add binding to mark a bus as supporting SMBus-Alert
@ 2021-05-07  0:55     ` Rob Herring
  0 siblings, 0 replies; 16+ messages in thread
From: Rob Herring @ 2021-05-07  0:55 UTC (permalink / raw)
  To: Alain Volmat
  Cc: wsa, mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier

On Wed, May 05, 2021 at 03:14:38PM +0200, Alain Volmat wrote:
> Since SMBus-Alert is an optional feature of SMBUS which
> requires an additional pin, the smbus binding cannot be
> used to indicate its support.
> 
> Add an additional smbus-alert binding specific for it and
> update the description text of smbus to avoid mentioning
> SMBus-Alert
> 
> Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
> ---
>  Documentation/devicetree/bindings/i2c/i2c.txt | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)

This needs to be added to i2c-bus.yaml too.

Acked-by: Rob Herring <robh@kernel.org>

> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt
> index df41f72afc87..b864916e087f 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c.txt
> @@ -89,8 +89,11 @@ wants to support one of the below features, it should adapt these bindings.
>  
>  - smbus
>  	states that additional SMBus restrictions and features apply to this bus.
> -	Examples of features are SMBusHostNotify and SMBusAlert. Examples of
> -	restrictions are more reserved addresses and timeout definitions.
> +	An example of feature is SMBusHostNotify. Examples of restrictions are
> +	more reserved addresses and timeout definitions.
> +
> +- smbus-alert
> +	states that the optional SMBus-Alert feature apply to this bus.
>  
>  Required properties (per child device)
>  --------------------------------------
> -- 
> 2.7.4
> 

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: [PATCH v4 2/2] i2c: stm32f7: add SMBus-Alert support
  2021-05-05 13:14   ` Alain Volmat
@ 2021-05-10  8:02     ` Pierre Yves MORDRET
  -1 siblings, 0 replies; 16+ messages in thread
From: Pierre Yves MORDRET @ 2021-05-10  8:02 UTC (permalink / raw)
  To: Alain Volmat, wsa, robh+dt
  Cc: mark.rutland, mcoquelin.stm32, alexandre.torgue, linux-i2c,
	devicetree, linux-stm32, linux-arm-kernel, linux-kernel,
	fabrice.gasnier

Hi all

Look good to me. I agree more generic


Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@foss.st.com>

Regards

On 5/5/21 3:14 PM, Alain Volmat wrote:
> Add support for the SMBus-Alert protocol to the STM32F7 that has
> dedicated control and status logic.
> 
> If SMBus-Alert is used, the SMBALERT# pin must be configured as alternate
> function for I2C Alert.
> 
> Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
> ---
> v4: - check for smbus-alert property
> v2: - rely on st,smbus-alert binding instead of smbus
> ---
>  drivers/i2c/busses/i2c-stm32f7.c | 73 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 73 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
> index 0138317ea600..b9b19a2a2ffa 100644
> --- a/drivers/i2c/busses/i2c-stm32f7.c
> +++ b/drivers/i2c/busses/i2c-stm32f7.c
> @@ -51,6 +51,7 @@
>  
>  /* STM32F7 I2C control 1 */
>  #define STM32F7_I2C_CR1_PECEN			BIT(23)
> +#define STM32F7_I2C_CR1_ALERTEN			BIT(22)
>  #define STM32F7_I2C_CR1_SMBHEN			BIT(20)
>  #define STM32F7_I2C_CR1_WUPEN			BIT(18)
>  #define STM32F7_I2C_CR1_SBC			BIT(16)
> @@ -125,6 +126,7 @@
>  				(((n) & STM32F7_I2C_ISR_ADDCODE_MASK) >> 17)
>  #define STM32F7_I2C_ISR_DIR			BIT(16)
>  #define STM32F7_I2C_ISR_BUSY			BIT(15)
> +#define STM32F7_I2C_ISR_ALERT			BIT(13)
>  #define STM32F7_I2C_ISR_PECERR			BIT(11)
>  #define STM32F7_I2C_ISR_ARLO			BIT(9)
>  #define STM32F7_I2C_ISR_BERR			BIT(8)
> @@ -138,6 +140,7 @@
>  #define STM32F7_I2C_ISR_TXE			BIT(0)
>  
>  /* STM32F7 I2C Interrupt Clear */
> +#define STM32F7_I2C_ICR_ALERTCF			BIT(13)
>  #define STM32F7_I2C_ICR_PECCF			BIT(11)
>  #define STM32F7_I2C_ICR_ARLOCF			BIT(9)
>  #define STM32F7_I2C_ICR_BERRCF			BIT(8)
> @@ -279,6 +282,17 @@ struct stm32f7_i2c_msg {
>  };
>  
>  /**
> + * struct stm32f7_i2c_alert - SMBus alert specific data
> + * @setup: platform data for the smbus_alert i2c client
> + * @ara: I2C slave device used to respond to the SMBus Alert with Alert
> + * Response Address
> + */
> +struct stm32f7_i2c_alert {
> +	struct i2c_smbus_alert_setup setup;
> +	struct i2c_client *ara;
> +};
> +
> +/**
>   * struct stm32f7_i2c_dev - private data of the controller
>   * @adap: I2C adapter for this controller
>   * @dev: device for this controller
> @@ -310,6 +324,7 @@ struct stm32f7_i2c_msg {
>   * @analog_filter: boolean to indicate enabling of the analog filter
>   * @dnf_dt: value of digital filter requested via dt
>   * @dnf: value of digital filter to apply
> + * @alert: SMBus alert specific data
>   */
>  struct stm32f7_i2c_dev {
>  	struct i2c_adapter adap;
> @@ -341,6 +356,7 @@ struct stm32f7_i2c_dev {
>  	bool analog_filter;
>  	u32 dnf_dt;
>  	u32 dnf;
> +	struct stm32f7_i2c_alert *alert;
>  };
>  
>  /*
> @@ -1624,6 +1640,13 @@ static irqreturn_t stm32f7_i2c_isr_error(int irq, void *data)
>  		f7_msg->result = -EINVAL;
>  	}
>  
> +	if (status & STM32F7_I2C_ISR_ALERT) {
> +		dev_dbg(dev, "<%s>: SMBus alert received\n", __func__);
> +		writel_relaxed(STM32F7_I2C_ICR_ALERTCF, base + STM32F7_I2C_ICR);
> +		i2c_handle_smbus_alert(i2c_dev->alert->ara);
> +		return IRQ_HANDLED;
> +	}
> +
>  	if (!i2c_dev->slave_running) {
>  		u32 mask;
>  		/* Disable interrupts */
> @@ -1990,6 +2013,42 @@ static void stm32f7_i2c_disable_smbus_host(struct stm32f7_i2c_dev *i2c_dev)
>  	}
>  }
>  
> +static int stm32f7_i2c_enable_smbus_alert(struct stm32f7_i2c_dev *i2c_dev)
> +{
> +	struct stm32f7_i2c_alert *alert;
> +	struct i2c_adapter *adap = &i2c_dev->adap;
> +	struct device *dev = i2c_dev->dev;
> +	void __iomem *base = i2c_dev->base;
> +
> +	alert = devm_kzalloc(dev, sizeof(*alert), GFP_KERNEL);
> +	if (!alert)
> +		return -ENOMEM;
> +
> +	alert->ara = i2c_new_smbus_alert_device(adap, &alert->setup);
> +	if (IS_ERR(alert->ara))
> +		return PTR_ERR(alert->ara);
> +
> +	i2c_dev->alert = alert;
> +
> +	/* Enable SMBus Alert */
> +	stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, STM32F7_I2C_CR1_ALERTEN);
> +
> +	return 0;
> +}
> +
> +static void stm32f7_i2c_disable_smbus_alert(struct stm32f7_i2c_dev *i2c_dev)
> +{
> +	struct stm32f7_i2c_alert *alert = i2c_dev->alert;
> +	void __iomem *base = i2c_dev->base;
> +
> +	if (alert) {
> +		/* Disable SMBus Alert */
> +		stm32f7_i2c_clr_bits(base + STM32F7_I2C_CR1,
> +				     STM32F7_I2C_CR1_ALERTEN);
> +		i2c_unregister_device(alert->ara);
> +	}
> +}
> +
>  static u32 stm32f7_i2c_func(struct i2c_adapter *adap)
>  {
>  	struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
> @@ -2173,6 +2232,16 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> +	if (of_property_read_bool(pdev->dev.of_node, "smbus-alert")) {
> +		ret = stm32f7_i2c_enable_smbus_alert(i2c_dev);
> +		if (ret) {
> +			dev_err(i2c_dev->dev,
> +				"failed to enable SMBus alert protocol (%d)\n",
> +				ret);
> +			goto i2c_disable_smbus_host;
> +		}
> +	}
> +
>  	dev_info(i2c_dev->dev, "STM32F7 I2C-%d bus adapter\n", adap->nr);
>  
>  	pm_runtime_mark_last_busy(i2c_dev->dev);
> @@ -2180,6 +2249,9 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
>  
>  	return 0;
>  
> +i2c_disable_smbus_host:
> +	stm32f7_i2c_disable_smbus_host(i2c_dev);
> +
>  i2c_adapter_remove:
>  	i2c_del_adapter(adap);
>  
> @@ -2214,6 +2286,7 @@ static int stm32f7_i2c_remove(struct platform_device *pdev)
>  {
>  	struct stm32f7_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
>  
> +	stm32f7_i2c_disable_smbus_alert(i2c_dev);
>  	stm32f7_i2c_disable_smbus_host(i2c_dev);
>  
>  	i2c_del_adapter(&i2c_dev->adap);
> 

-- 
--
~ Py MORDRET
--

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: [PATCH v4 2/2] i2c: stm32f7: add SMBus-Alert support
@ 2021-05-10  8:02     ` Pierre Yves MORDRET
  0 siblings, 0 replies; 16+ messages in thread
From: Pierre Yves MORDRET @ 2021-05-10  8:02 UTC (permalink / raw)
  To: Alain Volmat, wsa, robh+dt
  Cc: mark.rutland, mcoquelin.stm32, alexandre.torgue, linux-i2c,
	devicetree, linux-stm32, linux-arm-kernel, linux-kernel,
	fabrice.gasnier

Hi all

Look good to me. I agree more generic


Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@foss.st.com>

Regards

On 5/5/21 3:14 PM, Alain Volmat wrote:
> Add support for the SMBus-Alert protocol to the STM32F7 that has
> dedicated control and status logic.
> 
> If SMBus-Alert is used, the SMBALERT# pin must be configured as alternate
> function for I2C Alert.
> 
> Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
> ---
> v4: - check for smbus-alert property
> v2: - rely on st,smbus-alert binding instead of smbus
> ---
>  drivers/i2c/busses/i2c-stm32f7.c | 73 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 73 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
> index 0138317ea600..b9b19a2a2ffa 100644
> --- a/drivers/i2c/busses/i2c-stm32f7.c
> +++ b/drivers/i2c/busses/i2c-stm32f7.c
> @@ -51,6 +51,7 @@
>  
>  /* STM32F7 I2C control 1 */
>  #define STM32F7_I2C_CR1_PECEN			BIT(23)
> +#define STM32F7_I2C_CR1_ALERTEN			BIT(22)
>  #define STM32F7_I2C_CR1_SMBHEN			BIT(20)
>  #define STM32F7_I2C_CR1_WUPEN			BIT(18)
>  #define STM32F7_I2C_CR1_SBC			BIT(16)
> @@ -125,6 +126,7 @@
>  				(((n) & STM32F7_I2C_ISR_ADDCODE_MASK) >> 17)
>  #define STM32F7_I2C_ISR_DIR			BIT(16)
>  #define STM32F7_I2C_ISR_BUSY			BIT(15)
> +#define STM32F7_I2C_ISR_ALERT			BIT(13)
>  #define STM32F7_I2C_ISR_PECERR			BIT(11)
>  #define STM32F7_I2C_ISR_ARLO			BIT(9)
>  #define STM32F7_I2C_ISR_BERR			BIT(8)
> @@ -138,6 +140,7 @@
>  #define STM32F7_I2C_ISR_TXE			BIT(0)
>  
>  /* STM32F7 I2C Interrupt Clear */
> +#define STM32F7_I2C_ICR_ALERTCF			BIT(13)
>  #define STM32F7_I2C_ICR_PECCF			BIT(11)
>  #define STM32F7_I2C_ICR_ARLOCF			BIT(9)
>  #define STM32F7_I2C_ICR_BERRCF			BIT(8)
> @@ -279,6 +282,17 @@ struct stm32f7_i2c_msg {
>  };
>  
>  /**
> + * struct stm32f7_i2c_alert - SMBus alert specific data
> + * @setup: platform data for the smbus_alert i2c client
> + * @ara: I2C slave device used to respond to the SMBus Alert with Alert
> + * Response Address
> + */
> +struct stm32f7_i2c_alert {
> +	struct i2c_smbus_alert_setup setup;
> +	struct i2c_client *ara;
> +};
> +
> +/**
>   * struct stm32f7_i2c_dev - private data of the controller
>   * @adap: I2C adapter for this controller
>   * @dev: device for this controller
> @@ -310,6 +324,7 @@ struct stm32f7_i2c_msg {
>   * @analog_filter: boolean to indicate enabling of the analog filter
>   * @dnf_dt: value of digital filter requested via dt
>   * @dnf: value of digital filter to apply
> + * @alert: SMBus alert specific data
>   */
>  struct stm32f7_i2c_dev {
>  	struct i2c_adapter adap;
> @@ -341,6 +356,7 @@ struct stm32f7_i2c_dev {
>  	bool analog_filter;
>  	u32 dnf_dt;
>  	u32 dnf;
> +	struct stm32f7_i2c_alert *alert;
>  };
>  
>  /*
> @@ -1624,6 +1640,13 @@ static irqreturn_t stm32f7_i2c_isr_error(int irq, void *data)
>  		f7_msg->result = -EINVAL;
>  	}
>  
> +	if (status & STM32F7_I2C_ISR_ALERT) {
> +		dev_dbg(dev, "<%s>: SMBus alert received\n", __func__);
> +		writel_relaxed(STM32F7_I2C_ICR_ALERTCF, base + STM32F7_I2C_ICR);
> +		i2c_handle_smbus_alert(i2c_dev->alert->ara);
> +		return IRQ_HANDLED;
> +	}
> +
>  	if (!i2c_dev->slave_running) {
>  		u32 mask;
>  		/* Disable interrupts */
> @@ -1990,6 +2013,42 @@ static void stm32f7_i2c_disable_smbus_host(struct stm32f7_i2c_dev *i2c_dev)
>  	}
>  }
>  
> +static int stm32f7_i2c_enable_smbus_alert(struct stm32f7_i2c_dev *i2c_dev)
> +{
> +	struct stm32f7_i2c_alert *alert;
> +	struct i2c_adapter *adap = &i2c_dev->adap;
> +	struct device *dev = i2c_dev->dev;
> +	void __iomem *base = i2c_dev->base;
> +
> +	alert = devm_kzalloc(dev, sizeof(*alert), GFP_KERNEL);
> +	if (!alert)
> +		return -ENOMEM;
> +
> +	alert->ara = i2c_new_smbus_alert_device(adap, &alert->setup);
> +	if (IS_ERR(alert->ara))
> +		return PTR_ERR(alert->ara);
> +
> +	i2c_dev->alert = alert;
> +
> +	/* Enable SMBus Alert */
> +	stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, STM32F7_I2C_CR1_ALERTEN);
> +
> +	return 0;
> +}
> +
> +static void stm32f7_i2c_disable_smbus_alert(struct stm32f7_i2c_dev *i2c_dev)
> +{
> +	struct stm32f7_i2c_alert *alert = i2c_dev->alert;
> +	void __iomem *base = i2c_dev->base;
> +
> +	if (alert) {
> +		/* Disable SMBus Alert */
> +		stm32f7_i2c_clr_bits(base + STM32F7_I2C_CR1,
> +				     STM32F7_I2C_CR1_ALERTEN);
> +		i2c_unregister_device(alert->ara);
> +	}
> +}
> +
>  static u32 stm32f7_i2c_func(struct i2c_adapter *adap)
>  {
>  	struct stm32f7_i2c_dev *i2c_dev = i2c_get_adapdata(adap);
> @@ -2173,6 +2232,16 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> +	if (of_property_read_bool(pdev->dev.of_node, "smbus-alert")) {
> +		ret = stm32f7_i2c_enable_smbus_alert(i2c_dev);
> +		if (ret) {
> +			dev_err(i2c_dev->dev,
> +				"failed to enable SMBus alert protocol (%d)\n",
> +				ret);
> +			goto i2c_disable_smbus_host;
> +		}
> +	}
> +
>  	dev_info(i2c_dev->dev, "STM32F7 I2C-%d bus adapter\n", adap->nr);
>  
>  	pm_runtime_mark_last_busy(i2c_dev->dev);
> @@ -2180,6 +2249,9 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
>  
>  	return 0;
>  
> +i2c_disable_smbus_host:
> +	stm32f7_i2c_disable_smbus_host(i2c_dev);
> +
>  i2c_adapter_remove:
>  	i2c_del_adapter(adap);
>  
> @@ -2214,6 +2286,7 @@ static int stm32f7_i2c_remove(struct platform_device *pdev)
>  {
>  	struct stm32f7_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
>  
> +	stm32f7_i2c_disable_smbus_alert(i2c_dev);
>  	stm32f7_i2c_disable_smbus_host(i2c_dev);
>  
>  	i2c_del_adapter(&i2c_dev->adap);
> 

-- 
--
~ Py MORDRET
--

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: [PATCH v4 1/2] i2c: add binding to mark a bus as supporting SMBus-Alert
  2021-05-07  0:55     ` Rob Herring
@ 2021-05-25 19:47       ` Wolfram Sang
  -1 siblings, 0 replies; 16+ messages in thread
From: Wolfram Sang @ 2021-05-25 19:47 UTC (permalink / raw)
  To: Rob Herring
  Cc: Alain Volmat, mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier

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> This needs to be added to i2c-bus.yaml too.

We don't have that yet? Am I missing something?


[-- Attachment #2: signature.asc --]
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^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: [PATCH v4 1/2] i2c: add binding to mark a bus as supporting SMBus-Alert
@ 2021-05-25 19:47       ` Wolfram Sang
  0 siblings, 0 replies; 16+ messages in thread
From: Wolfram Sang @ 2021-05-25 19:47 UTC (permalink / raw)
  To: Rob Herring
  Cc: Alain Volmat, mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier


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> This needs to be added to i2c-bus.yaml too.

We don't have that yet? Am I missing something?


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^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: [PATCH v4 1/2] i2c: add binding to mark a bus as supporting SMBus-Alert
  2021-05-05 13:14   ` Alain Volmat
@ 2021-05-25 19:53     ` Wolfram Sang
  -1 siblings, 0 replies; 16+ messages in thread
From: Wolfram Sang @ 2021-05-25 19:53 UTC (permalink / raw)
  To: Alain Volmat
  Cc: robh+dt, mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier

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On Wed, May 05, 2021 at 03:14:38PM +0200, Alain Volmat wrote:
> Since SMBus-Alert is an optional feature of SMBUS which
> requires an additional pin, the smbus binding cannot be
> used to indicate its support.
> 
> Add an additional smbus-alert binding specific for it and
> update the description text of smbus to avoid mentioning
> SMBus-Alert
> 
> Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>

Applied to for-next, thanks!


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^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: [PATCH v4 1/2] i2c: add binding to mark a bus as supporting SMBus-Alert
@ 2021-05-25 19:53     ` Wolfram Sang
  0 siblings, 0 replies; 16+ messages in thread
From: Wolfram Sang @ 2021-05-25 19:53 UTC (permalink / raw)
  To: Alain Volmat
  Cc: robh+dt, mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier


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On Wed, May 05, 2021 at 03:14:38PM +0200, Alain Volmat wrote:
> Since SMBus-Alert is an optional feature of SMBUS which
> requires an additional pin, the smbus binding cannot be
> used to indicate its support.
> 
> Add an additional smbus-alert binding specific for it and
> update the description text of smbus to avoid mentioning
> SMBus-Alert
> 
> Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>

Applied to for-next, thanks!


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_______________________________________________
linux-arm-kernel mailing list
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: [PATCH v4 2/2] i2c: stm32f7: add SMBus-Alert support
  2021-05-05 13:14   ` Alain Volmat
@ 2021-05-25 19:53     ` Wolfram Sang
  -1 siblings, 0 replies; 16+ messages in thread
From: Wolfram Sang @ 2021-05-25 19:53 UTC (permalink / raw)
  To: Alain Volmat
  Cc: robh+dt, mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier

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On Wed, May 05, 2021 at 03:14:39PM +0200, Alain Volmat wrote:
> Add support for the SMBus-Alert protocol to the STM32F7 that has
> dedicated control and status logic.
> 
> If SMBus-Alert is used, the SMBALERT# pin must be configured as alternate
> function for I2C Alert.
> 
> Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>

Applied to for-next, thanks!


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^ permalink raw reply	[flat|nested] 16+ messages in thread

* Re: [PATCH v4 2/2] i2c: stm32f7: add SMBus-Alert support
@ 2021-05-25 19:53     ` Wolfram Sang
  0 siblings, 0 replies; 16+ messages in thread
From: Wolfram Sang @ 2021-05-25 19:53 UTC (permalink / raw)
  To: Alain Volmat
  Cc: robh+dt, mark.rutland, pierre-yves.mordret, mcoquelin.stm32,
	alexandre.torgue, linux-i2c, devicetree, linux-stm32,
	linux-arm-kernel, linux-kernel, fabrice.gasnier


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On Wed, May 05, 2021 at 03:14:39PM +0200, Alain Volmat wrote:
> Add support for the SMBus-Alert protocol to the STM32F7 that has
> dedicated control and status logic.
> 
> If SMBus-Alert is used, the SMBALERT# pin must be configured as alternate
> function for I2C Alert.
> 
> Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>

Applied to for-next, thanks!


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_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 16+ messages in thread

end of thread, other threads:[~2021-05-25 20:02 UTC | newest]

Thread overview: 16+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-05 13:14 [PATCH v4 0/2] i2c: stm32f7: add SMBus-Alert support Alain Volmat
2021-05-05 13:14 ` Alain Volmat
2021-05-05 13:14 ` [PATCH v4 1/2] i2c: add binding to mark a bus as supporting SMBus-Alert Alain Volmat
2021-05-05 13:14   ` Alain Volmat
2021-05-07  0:55   ` Rob Herring
2021-05-07  0:55     ` Rob Herring
2021-05-25 19:47     ` Wolfram Sang
2021-05-25 19:47       ` Wolfram Sang
2021-05-25 19:53   ` Wolfram Sang
2021-05-25 19:53     ` Wolfram Sang
2021-05-05 13:14 ` [PATCH v4 2/2] i2c: stm32f7: add SMBus-Alert support Alain Volmat
2021-05-05 13:14   ` Alain Volmat
2021-05-10  8:02   ` Pierre Yves MORDRET
2021-05-10  8:02     ` Pierre Yves MORDRET
2021-05-25 19:53   ` Wolfram Sang
2021-05-25 19:53     ` Wolfram Sang

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