[PATCH net-next 1/3] nfc: s3fwrn5: use signed integer for parsing GPIO numbers

[PATCH net-next 1/3] nfc: s3fwrn5: use signed integer for parsing GPIO numbers

[bongsu.jeon2]

From: Krzysztof Kozlowski <krzk@kernel.org>

GPIOs - as returned by of_get_named_gpio() and used by the gpiolib - are
signed integers, where negative number indicates error.  The return
value of of_get_named_gpio() should not be assigned to an unsigned int
because in case of !CONFIG_GPIOLIB such number would be a valid GPIO.

Fixes: c04c674fadeb ("nfc: s3fwrn5: Add driver for Samsung S3FWRN5 NFC Chip")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 drivers/nfc/s3fwrn5/i2c.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/nfc/s3fwrn5/i2c.c b/drivers/nfc/s3fwrn5/i2c.c
index 0ffa389..ae26594 100644
--- a/drivers/nfc/s3fwrn5/i2c.c
+++ b/drivers/nfc/s3fwrn5/i2c.c
@@ -25,8 +25,8 @@ struct s3fwrn5_i2c_phy {
 	struct i2c_client *i2c_dev;
 	struct nci_dev *ndev;
 
-	unsigned int gpio_en;
-	unsigned int gpio_fw_wake;
+	int gpio_en;
+	int gpio_fw_wake;
 
 	struct mutex mutex;
 
-- 
1.9.1

[PATCH net-next 2/3] nfc: s3fwrn5: reduce the EN_WAIT_TIME

[bongsu.jeon2]

From: Bongsu Jeon <bongsu.jeon@samsung.com>

The delay of 20ms is enough to enable and
wake up the Samsung's nfc chip.

Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
---
 drivers/nfc/s3fwrn5/i2c.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/nfc/s3fwrn5/i2c.c b/drivers/nfc/s3fwrn5/i2c.c
index ae26594..9a64eea 100644
--- a/drivers/nfc/s3fwrn5/i2c.c
+++ b/drivers/nfc/s3fwrn5/i2c.c
@@ -19,7 +19,7 @@
 
 #define S3FWRN5_I2C_DRIVER_NAME "s3fwrn5_i2c"
 
-#define S3FWRN5_EN_WAIT_TIME 150
+#define S3FWRN5_EN_WAIT_TIME 20
 
 struct s3fwrn5_i2c_phy {
 	struct i2c_client *i2c_dev;
@@ -40,7 +40,7 @@ static void s3fwrn5_i2c_set_wake(void *phy_id, bool wake)
 
 	mutex_lock(&phy->mutex);
 	gpio_set_value(phy->gpio_fw_wake, wake);
-	msleep(S3FWRN5_EN_WAIT_TIME/2);
+	msleep(S3FWRN5_EN_WAIT_TIME);
 	mutex_unlock(&phy->mutex);
 }
 
@@ -63,7 +63,7 @@ static void s3fwrn5_i2c_set_mode(void *phy_id, enum s3fwrn5_mode mode)
 	if (mode != S3FWRN5_MODE_COLD) {
 		msleep(S3FWRN5_EN_WAIT_TIME);
 		gpio_set_value(phy->gpio_en, 0);
-		msleep(S3FWRN5_EN_WAIT_TIME/2);
+		msleep(S3FWRN5_EN_WAIT_TIME);
 	}
 
 	phy->irq_skip = true;
-- 
1.9.1

Re: [PATCH net-next 2/3] nfc: s3fwrn5: reduce the EN_WAIT_TIME

[Krzysztof Kozlowski]

On Fri, Nov 27, 2020 at 12:33:38AM +0900, bongsu.jeon2@gmail.com wrote:
> From: Bongsu Jeon <bongsu.jeon@samsung.com>
> 
> The delay of 20ms is enough to enable and
> wake up the Samsung's nfc chip.
> 
> Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
> ---
>  drivers/nfc/s3fwrn5/i2c.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/nfc/s3fwrn5/i2c.c b/drivers/nfc/s3fwrn5/i2c.c
> index ae26594..9a64eea 100644
> --- a/drivers/nfc/s3fwrn5/i2c.c
> +++ b/drivers/nfc/s3fwrn5/i2c.c
> @@ -19,7 +19,7 @@
>  

Acked-by: Krzysztof Kozlowski <krzk@kernel.org>

Best regards,
Krzysztof

[PATCH net-next 3/3] nfc: s3fwrn5: extract the common phy blocks

[bongsu.jeon2]

From: Bongsu Jeon <bongsu.jeon@samsung.com>

Extract the common phy blocks to reuse it.
The UART module will use the common blocks.

Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
---
 drivers/nfc/s3fwrn5/i2c.c        | 111 ++++++++++++---------------------------
 drivers/nfc/s3fwrn5/phy_common.h |  86 ++++++++++++++++++++++++++++++
 2 files changed, 119 insertions(+), 78 deletions(-)
 create mode 100644 drivers/nfc/s3fwrn5/phy_common.h

diff --git a/drivers/nfc/s3fwrn5/i2c.c b/drivers/nfc/s3fwrn5/i2c.c
index 9a64eea..cd1b2a7 100644
--- a/drivers/nfc/s3fwrn5/i2c.c
+++ b/drivers/nfc/s3fwrn5/i2c.c
@@ -15,75 +15,30 @@
 
 #include <net/nfc/nfc.h>
 
-#include "s3fwrn5.h"
+#include "phy_common.h"
 
 #define S3FWRN5_I2C_DRIVER_NAME "s3fwrn5_i2c"
 
-#define S3FWRN5_EN_WAIT_TIME 20
-
 struct s3fwrn5_i2c_phy {
+	struct phy_common common;
 	struct i2c_client *i2c_dev;
-	struct nci_dev *ndev;
-
-	int gpio_en;
-	int gpio_fw_wake;
-
-	struct mutex mutex;
 
-	enum s3fwrn5_mode mode;
 	unsigned int irq_skip:1;
 };
 
-static void s3fwrn5_i2c_set_wake(void *phy_id, bool wake)
-{
-	struct s3fwrn5_i2c_phy *phy = phy_id;
-
-	mutex_lock(&phy->mutex);
-	gpio_set_value(phy->gpio_fw_wake, wake);
-	msleep(S3FWRN5_EN_WAIT_TIME);
-	mutex_unlock(&phy->mutex);
-}
-
 static void s3fwrn5_i2c_set_mode(void *phy_id, enum s3fwrn5_mode mode)
 {
 	struct s3fwrn5_i2c_phy *phy = phy_id;
 
-	mutex_lock(&phy->mutex);
+	mutex_lock(&phy->common.mutex);
 
-	if (phy->mode == mode)
+	if (s3fwrn5_phy_power_ctrl(&phy->common, mode) == false)
 		goto out;
 
-	phy->mode = mode;
-
-	gpio_set_value(phy->gpio_en, 1);
-	gpio_set_value(phy->gpio_fw_wake, 0);
-	if (mode == S3FWRN5_MODE_FW)
-		gpio_set_value(phy->gpio_fw_wake, 1);
-
-	if (mode != S3FWRN5_MODE_COLD) {
-		msleep(S3FWRN5_EN_WAIT_TIME);
-		gpio_set_value(phy->gpio_en, 0);
-		msleep(S3FWRN5_EN_WAIT_TIME);
-	}
-
 	phy->irq_skip = true;
 
 out:
-	mutex_unlock(&phy->mutex);
-}
-
-static enum s3fwrn5_mode s3fwrn5_i2c_get_mode(void *phy_id)
-{
-	struct s3fwrn5_i2c_phy *phy = phy_id;
-	enum s3fwrn5_mode mode;
-
-	mutex_lock(&phy->mutex);
-
-	mode = phy->mode;
-
-	mutex_unlock(&phy->mutex);
-
-	return mode;
+	mutex_unlock(&phy->common.mutex);
 }
 
 static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
@@ -91,7 +46,7 @@ static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
 	struct s3fwrn5_i2c_phy *phy = phy_id;
 	int ret;
 
-	mutex_lock(&phy->mutex);
+	mutex_lock(&phy->common.mutex);
 
 	phy->irq_skip = false;
 
@@ -102,7 +57,7 @@ static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
 		ret  = i2c_master_send(phy->i2c_dev, skb->data, skb->len);
 	}
 
-	mutex_unlock(&phy->mutex);
+	mutex_unlock(&phy->common.mutex);
 
 	if (ret < 0)
 		return ret;
@@ -114,9 +69,9 @@ static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
 }
 
 static const struct s3fwrn5_phy_ops i2c_phy_ops = {
-	.set_wake = s3fwrn5_i2c_set_wake,
+	.set_wake = s3fwrn5_phy_set_wake,
 	.set_mode = s3fwrn5_i2c_set_mode,
-	.get_mode = s3fwrn5_i2c_get_mode,
+	.get_mode = s3fwrn5_phy_get_mode,
 	.write = s3fwrn5_i2c_write,
 };
 
@@ -128,7 +83,7 @@ static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
 	char hdr[4];
 	int ret;
 
-	hdr_size = (phy->mode == S3FWRN5_MODE_NCI) ?
+	hdr_size = (phy->common.mode == S3FWRN5_MODE_NCI) ?
 		NCI_CTRL_HDR_SIZE : S3FWRN5_FW_HDR_SIZE;
 	ret = i2c_master_recv(phy->i2c_dev, hdr, hdr_size);
 	if (ret < 0)
@@ -137,7 +92,7 @@ static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
 	if (ret < hdr_size)
 		return -EBADMSG;
 
-	data_len = (phy->mode == S3FWRN5_MODE_NCI) ?
+	data_len = (phy->common.mode == S3FWRN5_MODE_NCI) ?
 		((struct nci_ctrl_hdr *)hdr)->plen :
 		((struct s3fwrn5_fw_header *)hdr)->len;
 
@@ -157,24 +112,24 @@ static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
 	}
 
 out:
-	return s3fwrn5_recv_frame(phy->ndev, skb, phy->mode);
+	return s3fwrn5_recv_frame(phy->common.ndev, skb, phy->common.mode);
 }
 
 static irqreturn_t s3fwrn5_i2c_irq_thread_fn(int irq, void *phy_id)
 {
 	struct s3fwrn5_i2c_phy *phy = phy_id;
 
-	if (!phy || !phy->ndev) {
+	if (!phy || !phy->common.ndev) {
 		WARN_ON_ONCE(1);
 		return IRQ_NONE;
 	}
 
-	mutex_lock(&phy->mutex);
+	mutex_lock(&phy->common.mutex);
 
 	if (phy->irq_skip)
 		goto out;
 
-	switch (phy->mode) {
+	switch (phy->common.mode) {
 	case S3FWRN5_MODE_NCI:
 	case S3FWRN5_MODE_FW:
 		s3fwrn5_i2c_read(phy);
@@ -184,7 +139,7 @@ static irqreturn_t s3fwrn5_i2c_irq_thread_fn(int irq, void *phy_id)
 	}
 
 out:
-	mutex_unlock(&phy->mutex);
+	mutex_unlock(&phy->common.mutex);
 
 	return IRQ_HANDLED;
 }
@@ -197,19 +152,19 @@ static int s3fwrn5_i2c_parse_dt(struct i2c_client *client)
 	if (!np)
 		return -ENODEV;
 
-	phy->gpio_en = of_get_named_gpio(np, "en-gpios", 0);
-	if (!gpio_is_valid(phy->gpio_en)) {
+	phy->common.gpio_en = of_get_named_gpio(np, "en-gpios", 0);
+	if (!gpio_is_valid(phy->common.gpio_en)) {
 		/* Support also deprecated property */
-		phy->gpio_en = of_get_named_gpio(np, "s3fwrn5,en-gpios", 0);
-		if (!gpio_is_valid(phy->gpio_en))
+		phy->common.gpio_en = of_get_named_gpio(np, "s3fwrn5,en-gpios", 0);
+		if (!gpio_is_valid(phy->common.gpio_en))
 			return -ENODEV;
 	}
 
-	phy->gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0);
-	if (!gpio_is_valid(phy->gpio_fw_wake)) {
+	phy->common.gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0);
+	if (!gpio_is_valid(phy->common.gpio_fw_wake)) {
 		/* Support also deprecated property */
-		phy->gpio_fw_wake = of_get_named_gpio(np, "s3fwrn5,fw-gpios", 0);
-		if (!gpio_is_valid(phy->gpio_fw_wake))
+		phy->common.gpio_fw_wake = of_get_named_gpio(np, "s3fwrn5,fw-gpios", 0);
+		if (!gpio_is_valid(phy->common.gpio_fw_wake))
 			return -ENODEV;
 	}
 
@@ -226,8 +181,8 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client,
 	if (!phy)
 		return -ENOMEM;
 
-	mutex_init(&phy->mutex);
-	phy->mode = S3FWRN5_MODE_COLD;
+	mutex_init(&phy->common.mutex);
+	phy->common.mode = S3FWRN5_MODE_COLD;
 	phy->irq_skip = true;
 
 	phy->i2c_dev = client;
@@ -237,17 +192,17 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client,
 	if (ret < 0)
 		return ret;
 
-	ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_en,
-		GPIOF_OUT_INIT_HIGH, "s3fwrn5_en");
+	ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->common.gpio_en,
+				    GPIOF_OUT_INIT_HIGH, "s3fwrn5_en");
 	if (ret < 0)
 		return ret;
 
-	ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_fw_wake,
-		GPIOF_OUT_INIT_LOW, "s3fwrn5_fw_wake");
+	ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->common.gpio_fw_wake,
+				    GPIOF_OUT_INIT_LOW, "s3fwrn5_fw_wake");
 	if (ret < 0)
 		return ret;
 
-	ret = s3fwrn5_probe(&phy->ndev, phy, &phy->i2c_dev->dev, &i2c_phy_ops);
+	ret = s3fwrn5_probe(&phy->common.ndev, phy, &phy->i2c_dev->dev, &i2c_phy_ops);
 	if (ret < 0)
 		return ret;
 
@@ -255,7 +210,7 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client,
 		s3fwrn5_i2c_irq_thread_fn, IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
 		S3FWRN5_I2C_DRIVER_NAME, phy);
 	if (ret)
-		s3fwrn5_remove(phy->ndev);
+		s3fwrn5_remove(phy->common.ndev);
 
 	return ret;
 }
@@ -264,7 +219,7 @@ static int s3fwrn5_i2c_remove(struct i2c_client *client)
 {
 	struct s3fwrn5_i2c_phy *phy = i2c_get_clientdata(client);
 
-	s3fwrn5_remove(phy->ndev);
+	s3fwrn5_remove(phy->common.ndev);
 
 	return 0;
 }
diff --git a/drivers/nfc/s3fwrn5/phy_common.h b/drivers/nfc/s3fwrn5/phy_common.h
new file mode 100644
index 0000000..14f7690
--- /dev/null
+++ b/drivers/nfc/s3fwrn5/phy_common.h
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * Link Layer for Samsung S3FWRN5 NCI based Driver
+ *
+ * Copyright (C) 2015 Samsung Electrnoics
+ * Robert Baldyga <r.baldyga@samsung.com>
+ * Copyright (C) 2020 Samsung Electrnoics
+ * Bongsu Jeon <bongsu.jeon@samsung.com>
+ */
+
+#ifndef __LOCAL_PHY_COMMON_H
+#define __LOCAL_PHY_COMMON_H
+
+#include "s3fwrn5.h"
+
+#define S3FWRN5_EN_WAIT_TIME 20
+
+struct phy_common {
+	struct nci_dev *ndev;
+
+	int gpio_en;
+	int gpio_fw_wake;
+
+	struct mutex mutex;
+
+	enum s3fwrn5_mode mode;
+};
+
+static inline void s3fwrn5_phy_set_wake(void *phy_id, bool wake)
+{
+	struct phy_common *phy = phy_id;
+
+	mutex_lock(&phy->mutex);
+	gpio_set_value(phy->gpio_fw_wake, wake);
+	msleep(S3FWRN5_EN_WAIT_TIME);
+	mutex_unlock(&phy->mutex);
+}
+
+static inline bool s3fwrn5_phy_power_ctrl(struct phy_common *phy,
+					  enum s3fwrn5_mode mode)
+{
+	if (phy->mode == mode)
+		return false;
+
+	phy->mode = mode;
+
+	gpio_set_value(phy->gpio_en, 1);
+	gpio_set_value(phy->gpio_fw_wake, 0);
+	if (mode == S3FWRN5_MODE_FW)
+		gpio_set_value(phy->gpio_fw_wake, 1);
+
+	if (mode != S3FWRN5_MODE_COLD) {
+		msleep(S3FWRN5_EN_WAIT_TIME);
+		gpio_set_value(phy->gpio_en, 0);
+		msleep(S3FWRN5_EN_WAIT_TIME);
+	}
+
+	return true;
+}
+
+static inline void s3fwrn5_phy_set_mode(void *phy_id, enum s3fwrn5_mode mode)
+{
+	struct phy_common *phy = phy_id;
+
+	mutex_lock(&phy->mutex);
+
+	s3fwrn5_phy_power_ctrl(phy, mode);
+
+	mutex_unlock(&phy->mutex);
+}
+
+static inline enum s3fwrn5_mode s3fwrn5_phy_get_mode(void *phy_id)
+{
+	struct phy_common *phy = phy_id;
+	enum s3fwrn5_mode mode;
+
+	mutex_lock(&phy->mutex);
+
+	mode = phy->mode;
+
+	mutex_unlock(&phy->mutex);
+
+	return mode;
+}
+
+#endif /* __LOCAL_PHY_COMMON_H_ */
-- 
1.9.1

Re: [PATCH net-next 3/3] nfc: s3fwrn5: extract the common phy blocks

[Krzysztof Kozlowski]

On Fri, Nov 27, 2020 at 12:33:39AM +0900, bongsu.jeon2@gmail.com wrote:
> From: Bongsu Jeon <bongsu.jeon@samsung.com>
> 
> Extract the common phy blocks to reuse it.
> The UART module will use the common blocks.


Hi,

Thanks for the patch. Few comments below.

> Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
> ---
>  drivers/nfc/s3fwrn5/i2c.c        | 111 ++++++++++++---------------------------
>  drivers/nfc/s3fwrn5/phy_common.h |  86 ++++++++++++++++++++++++++++++
>  2 files changed, 119 insertions(+), 78 deletions(-)
>  create mode 100644 drivers/nfc/s3fwrn5/phy_common.h
> 
> diff --git a/drivers/nfc/s3fwrn5/i2c.c b/drivers/nfc/s3fwrn5/i2c.c
> index 9a64eea..cd1b2a7 100644
> --- a/drivers/nfc/s3fwrn5/i2c.c
> +++ b/drivers/nfc/s3fwrn5/i2c.c
> @@ -15,75 +15,30 @@
>  
>  #include <net/nfc/nfc.h>
>  
> -#include "s3fwrn5.h"
> +#include "phy_common.h"
>  
>  #define S3FWRN5_I2C_DRIVER_NAME "s3fwrn5_i2c"
>  
> -#define S3FWRN5_EN_WAIT_TIME 20
> -
>  struct s3fwrn5_i2c_phy {
> +	struct phy_common common;
>  	struct i2c_client *i2c_dev;
> -	struct nci_dev *ndev;
> -
> -	int gpio_en;
> -	int gpio_fw_wake;
> -
> -	struct mutex mutex;
>  
> -	enum s3fwrn5_mode mode;
>  	unsigned int irq_skip:1;
>  };
>  
> -static void s3fwrn5_i2c_set_wake(void *phy_id, bool wake)
> -{
> -	struct s3fwrn5_i2c_phy *phy = phy_id;
> -
> -	mutex_lock(&phy->mutex);
> -	gpio_set_value(phy->gpio_fw_wake, wake);
> -	msleep(S3FWRN5_EN_WAIT_TIME);
> -	mutex_unlock(&phy->mutex);
> -}
> -
>  static void s3fwrn5_i2c_set_mode(void *phy_id, enum s3fwrn5_mode mode)
>  {
>  	struct s3fwrn5_i2c_phy *phy = phy_id;
>  
> -	mutex_lock(&phy->mutex);
> +	mutex_lock(&phy->common.mutex);
>  
> -	if (phy->mode == mode)
> +	if (s3fwrn5_phy_power_ctrl(&phy->common, mode) == false)
>  		goto out;
>  
> -	phy->mode = mode;
> -
> -	gpio_set_value(phy->gpio_en, 1);
> -	gpio_set_value(phy->gpio_fw_wake, 0);
> -	if (mode == S3FWRN5_MODE_FW)
> -		gpio_set_value(phy->gpio_fw_wake, 1);
> -
> -	if (mode != S3FWRN5_MODE_COLD) {
> -		msleep(S3FWRN5_EN_WAIT_TIME);
> -		gpio_set_value(phy->gpio_en, 0);
> -		msleep(S3FWRN5_EN_WAIT_TIME);
> -	}
> -
>  	phy->irq_skip = true;
>  
>  out:
> -	mutex_unlock(&phy->mutex);
> -}
> -
> -static enum s3fwrn5_mode s3fwrn5_i2c_get_mode(void *phy_id)
> -{
> -	struct s3fwrn5_i2c_phy *phy = phy_id;
> -	enum s3fwrn5_mode mode;
> -
> -	mutex_lock(&phy->mutex);
> -
> -	mode = phy->mode;
> -
> -	mutex_unlock(&phy->mutex);
> -
> -	return mode;
> +	mutex_unlock(&phy->common.mutex);
>  }
>  
>  static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
> @@ -91,7 +46,7 @@ static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
>  	struct s3fwrn5_i2c_phy *phy = phy_id;
>  	int ret;
>  
> -	mutex_lock(&phy->mutex);
> +	mutex_lock(&phy->common.mutex);
>  
>  	phy->irq_skip = false;
>  
> @@ -102,7 +57,7 @@ static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
>  		ret  = i2c_master_send(phy->i2c_dev, skb->data, skb->len);
>  	}
>  
> -	mutex_unlock(&phy->mutex);
> +	mutex_unlock(&phy->common.mutex);
>  
>  	if (ret < 0)
>  		return ret;
> @@ -114,9 +69,9 @@ static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
>  }
>  
>  static const struct s3fwrn5_phy_ops i2c_phy_ops = {
> -	.set_wake = s3fwrn5_i2c_set_wake,
> +	.set_wake = s3fwrn5_phy_set_wake,
>  	.set_mode = s3fwrn5_i2c_set_mode,
> -	.get_mode = s3fwrn5_i2c_get_mode,
> +	.get_mode = s3fwrn5_phy_get_mode,
>  	.write = s3fwrn5_i2c_write,
>  };
>  
> @@ -128,7 +83,7 @@ static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
>  	char hdr[4];
>  	int ret;
>  
> -	hdr_size = (phy->mode == S3FWRN5_MODE_NCI) ?
> +	hdr_size = (phy->common.mode == S3FWRN5_MODE_NCI) ?
>  		NCI_CTRL_HDR_SIZE : S3FWRN5_FW_HDR_SIZE;
>  	ret = i2c_master_recv(phy->i2c_dev, hdr, hdr_size);
>  	if (ret < 0)
> @@ -137,7 +92,7 @@ static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
>  	if (ret < hdr_size)
>  		return -EBADMSG;
>  
> -	data_len = (phy->mode == S3FWRN5_MODE_NCI) ?
> +	data_len = (phy->common.mode == S3FWRN5_MODE_NCI) ?
>  		((struct nci_ctrl_hdr *)hdr)->plen :
>  		((struct s3fwrn5_fw_header *)hdr)->len;
>  
> @@ -157,24 +112,24 @@ static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
>  	}
>  
>  out:
> -	return s3fwrn5_recv_frame(phy->ndev, skb, phy->mode);
> +	return s3fwrn5_recv_frame(phy->common.ndev, skb, phy->common.mode);
>  }
>  
>  static irqreturn_t s3fwrn5_i2c_irq_thread_fn(int irq, void *phy_id)
>  {
>  	struct s3fwrn5_i2c_phy *phy = phy_id;
>  
> -	if (!phy || !phy->ndev) {
> +	if (!phy || !phy->common.ndev) {
>  		WARN_ON_ONCE(1);
>  		return IRQ_NONE;
>  	}
>  
> -	mutex_lock(&phy->mutex);
> +	mutex_lock(&phy->common.mutex);
>  
>  	if (phy->irq_skip)
>  		goto out;
>  
> -	switch (phy->mode) {
> +	switch (phy->common.mode) {
>  	case S3FWRN5_MODE_NCI:
>  	case S3FWRN5_MODE_FW:
>  		s3fwrn5_i2c_read(phy);
> @@ -184,7 +139,7 @@ static irqreturn_t s3fwrn5_i2c_irq_thread_fn(int irq, void *phy_id)
>  	}
>  
>  out:
> -	mutex_unlock(&phy->mutex);
> +	mutex_unlock(&phy->common.mutex);
>  
>  	return IRQ_HANDLED;
>  }
> @@ -197,19 +152,19 @@ static int s3fwrn5_i2c_parse_dt(struct i2c_client *client)
>  	if (!np)
>  		return -ENODEV;
>  
> -	phy->gpio_en = of_get_named_gpio(np, "en-gpios", 0);
> -	if (!gpio_is_valid(phy->gpio_en)) {
> +	phy->common.gpio_en = of_get_named_gpio(np, "en-gpios", 0);
> +	if (!gpio_is_valid(phy->common.gpio_en)) {
>  		/* Support also deprecated property */
> -		phy->gpio_en = of_get_named_gpio(np, "s3fwrn5,en-gpios", 0);
> -		if (!gpio_is_valid(phy->gpio_en))
> +		phy->common.gpio_en = of_get_named_gpio(np, "s3fwrn5,en-gpios", 0);
> +		if (!gpio_is_valid(phy->common.gpio_en))
>  			return -ENODEV;
>  	}
>  
> -	phy->gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0);
> -	if (!gpio_is_valid(phy->gpio_fw_wake)) {
> +	phy->common.gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0);
> +	if (!gpio_is_valid(phy->common.gpio_fw_wake)) {
>  		/* Support also deprecated property */
> -		phy->gpio_fw_wake = of_get_named_gpio(np, "s3fwrn5,fw-gpios", 0);
> -		if (!gpio_is_valid(phy->gpio_fw_wake))
> +		phy->common.gpio_fw_wake = of_get_named_gpio(np, "s3fwrn5,fw-gpios", 0);

The lines here should wrap at 80 character.

> +		if (!gpio_is_valid(phy->common.gpio_fw_wake))
>  			return -ENODEV;
>  	}
>  
> @@ -226,8 +181,8 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client,
>  	if (!phy)
>  		return -ENOMEM;
>  
> -	mutex_init(&phy->mutex);
> -	phy->mode = S3FWRN5_MODE_COLD;
> +	mutex_init(&phy->common.mutex);
> +	phy->common.mode = S3FWRN5_MODE_COLD;
>  	phy->irq_skip = true;
>  
>  	phy->i2c_dev = client;
> @@ -237,17 +192,17 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client,
>  	if (ret < 0)
>  		return ret;
>  
> -	ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_en,
> -		GPIOF_OUT_INIT_HIGH, "s3fwrn5_en");
> +	ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->common.gpio_en,
> +				    GPIOF_OUT_INIT_HIGH, "s3fwrn5_en");
>  	if (ret < 0)
>  		return ret;
>  
> -	ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_fw_wake,
> -		GPIOF_OUT_INIT_LOW, "s3fwrn5_fw_wake");
> +	ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->common.gpio_fw_wake,
> +				    GPIOF_OUT_INIT_LOW, "s3fwrn5_fw_wake");
>  	if (ret < 0)
>  		return ret;
>  
> -	ret = s3fwrn5_probe(&phy->ndev, phy, &phy->i2c_dev->dev, &i2c_phy_ops);
> +	ret = s3fwrn5_probe(&phy->common.ndev, phy, &phy->i2c_dev->dev, &i2c_phy_ops);

Please wrap the lines.

>  	if (ret < 0)
>  		return ret;
>  
> @@ -255,7 +210,7 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client,
>  		s3fwrn5_i2c_irq_thread_fn, IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
>  		S3FWRN5_I2C_DRIVER_NAME, phy);
>  	if (ret)
> -		s3fwrn5_remove(phy->ndev);
> +		s3fwrn5_remove(phy->common.ndev);
>  
>  	return ret;
>  }
> @@ -264,7 +219,7 @@ static int s3fwrn5_i2c_remove(struct i2c_client *client)
>  {
>  	struct s3fwrn5_i2c_phy *phy = i2c_get_clientdata(client);
>  
> -	s3fwrn5_remove(phy->ndev);
> +	s3fwrn5_remove(phy->common.ndev);
>  
>  	return 0;
>  }
> diff --git a/drivers/nfc/s3fwrn5/phy_common.h b/drivers/nfc/s3fwrn5/phy_common.h
> new file mode 100644
> index 0000000..14f7690
> --- /dev/null
> +++ b/drivers/nfc/s3fwrn5/phy_common.h
> @@ -0,0 +1,86 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later
> + *
> + * Link Layer for Samsung S3FWRN5 NCI based Driver
> + *
> + * Copyright (C) 2015 Samsung Electrnoics
> + * Robert Baldyga <r.baldyga@samsung.com>
> + * Copyright (C) 2020 Samsung Electrnoics
> + * Bongsu Jeon <bongsu.jeon@samsung.com>
> + */
> +
> +#ifndef __LOCAL_PHY_COMMON_H
> +#define __LOCAL_PHY_COMMON_H

Header guard: __NFC_S3FWRN5_PHY_COMMON_H

> +
> +#include "s3fwrn5.h"

This include should not be needed.

> +
> +#define S3FWRN5_EN_WAIT_TIME 20
> +
> +struct phy_common {
> +	struct nci_dev *ndev;
> +
> +	int gpio_en;
> +	int gpio_fw_wake;
> +
> +	struct mutex mutex;
> +
> +	enum s3fwrn5_mode mode;
> +};
> +
> +static inline void s3fwrn5_phy_set_wake(void *phy_id, bool wake)
> +{

All these should go to a C source file. If needed - GPL exported.

> +	struct phy_common *phy = phy_id;
> +
> +	mutex_lock(&phy->mutex);
> +	gpio_set_value(phy->gpio_fw_wake, wake);
> +	msleep(S3FWRN5_EN_WAIT_TIME);
> +	mutex_unlock(&phy->mutex);
> +}
> +
> +static inline bool s3fwrn5_phy_power_ctrl(struct phy_common *phy,
> +					  enum s3fwrn5_mode mode)
> +{
> +	if (phy->mode == mode)
> +		return false;
> +
> +	phy->mode = mode;
> +
> +	gpio_set_value(phy->gpio_en, 1);
> +	gpio_set_value(phy->gpio_fw_wake, 0);
> +	if (mode == S3FWRN5_MODE_FW)
> +		gpio_set_value(phy->gpio_fw_wake, 1);
> +
> +	if (mode != S3FWRN5_MODE_COLD) {
> +		msleep(S3FWRN5_EN_WAIT_TIME);
> +		gpio_set_value(phy->gpio_en, 0);
> +		msleep(S3FWRN5_EN_WAIT_TIME);
> +	}
> +
> +	return true;
> +}
> +
> +static inline void s3fwrn5_phy_set_mode(void *phy_id, enum s3fwrn5_mode mode)
> +{

This looks unused. If you need it only for your next chip, add it with
next patch (the patch adding the user).

Best regards,
Krzysztof

Re: [PATCH net-next 3/3] nfc: s3fwrn5: extract the common phy blocks

[Bongsu Jeon]

On Fri, Nov 27, 2020 at 2:13 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> On Fri, Nov 27, 2020 at 12:33:39AM +0900, bongsu.jeon2@gmail.com wrote:
> > From: Bongsu Jeon <bongsu.jeon@samsung.com>
> >
> > Extract the common phy blocks to reuse it.
> > The UART module will use the common blocks.
>
>
> Hi,
>
> Thanks for the patch. Few comments below.
>
> > Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
> > ---
> >  drivers/nfc/s3fwrn5/i2c.c        | 111 ++++++++++++---------------------------
> >  drivers/nfc/s3fwrn5/phy_common.h |  86 ++++++++++++++++++++++++++++++
> >  2 files changed, 119 insertions(+), 78 deletions(-)
> >  create mode 100644 drivers/nfc/s3fwrn5/phy_common.h
> >
> > diff --git a/drivers/nfc/s3fwrn5/i2c.c b/drivers/nfc/s3fwrn5/i2c.c
> > index 9a64eea..cd1b2a7 100644
> > --- a/drivers/nfc/s3fwrn5/i2c.c
> > +++ b/drivers/nfc/s3fwrn5/i2c.c
> > @@ -15,75 +15,30 @@
> >
> >  #include <net/nfc/nfc.h>
> >
> > -#include "s3fwrn5.h"
> > +#include "phy_common.h"
> >
> >  #define S3FWRN5_I2C_DRIVER_NAME "s3fwrn5_i2c"
> >
> > -#define S3FWRN5_EN_WAIT_TIME 20
> > -
> >  struct s3fwrn5_i2c_phy {
> > +     struct phy_common common;
> >       struct i2c_client *i2c_dev;
> > -     struct nci_dev *ndev;
> > -
> > -     int gpio_en;
> > -     int gpio_fw_wake;
> > -
> > -     struct mutex mutex;
> >
> > -     enum s3fwrn5_mode mode;
> >       unsigned int irq_skip:1;
> >  };
> >
> > -static void s3fwrn5_i2c_set_wake(void *phy_id, bool wake)
> > -{
> > -     struct s3fwrn5_i2c_phy *phy = phy_id;
> > -
> > -     mutex_lock(&phy->mutex);
> > -     gpio_set_value(phy->gpio_fw_wake, wake);
> > -     msleep(S3FWRN5_EN_WAIT_TIME);
> > -     mutex_unlock(&phy->mutex);
> > -}
> > -
> >  static void s3fwrn5_i2c_set_mode(void *phy_id, enum s3fwrn5_mode mode)
> >  {
> >       struct s3fwrn5_i2c_phy *phy = phy_id;
> >
> > -     mutex_lock(&phy->mutex);
> > +     mutex_lock(&phy->common.mutex);
> >
> > -     if (phy->mode == mode)
> > +     if (s3fwrn5_phy_power_ctrl(&phy->common, mode) == false)
> >               goto out;
> >
> > -     phy->mode = mode;
> > -
> > -     gpio_set_value(phy->gpio_en, 1);
> > -     gpio_set_value(phy->gpio_fw_wake, 0);
> > -     if (mode == S3FWRN5_MODE_FW)
> > -             gpio_set_value(phy->gpio_fw_wake, 1);
> > -
> > -     if (mode != S3FWRN5_MODE_COLD) {
> > -             msleep(S3FWRN5_EN_WAIT_TIME);
> > -             gpio_set_value(phy->gpio_en, 0);
> > -             msleep(S3FWRN5_EN_WAIT_TIME);
> > -     }
> > -
> >       phy->irq_skip = true;
> >
> >  out:
> > -     mutex_unlock(&phy->mutex);
> > -}
> > -
> > -static enum s3fwrn5_mode s3fwrn5_i2c_get_mode(void *phy_id)
> > -{
> > -     struct s3fwrn5_i2c_phy *phy = phy_id;
> > -     enum s3fwrn5_mode mode;
> > -
> > -     mutex_lock(&phy->mutex);
> > -
> > -     mode = phy->mode;
> > -
> > -     mutex_unlock(&phy->mutex);
> > -
> > -     return mode;
> > +     mutex_unlock(&phy->common.mutex);
> >  }
> >
> >  static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
> > @@ -91,7 +46,7 @@ static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
> >       struct s3fwrn5_i2c_phy *phy = phy_id;
> >       int ret;
> >
> > -     mutex_lock(&phy->mutex);
> > +     mutex_lock(&phy->common.mutex);
> >
> >       phy->irq_skip = false;
> >
> > @@ -102,7 +57,7 @@ static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
> >               ret  = i2c_master_send(phy->i2c_dev, skb->data, skb->len);
> >       }
> >
> > -     mutex_unlock(&phy->mutex);
> > +     mutex_unlock(&phy->common.mutex);
> >
> >       if (ret < 0)
> >               return ret;
> > @@ -114,9 +69,9 @@ static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
> >  }
> >
> >  static const struct s3fwrn5_phy_ops i2c_phy_ops = {
> > -     .set_wake = s3fwrn5_i2c_set_wake,
> > +     .set_wake = s3fwrn5_phy_set_wake,
> >       .set_mode = s3fwrn5_i2c_set_mode,
> > -     .get_mode = s3fwrn5_i2c_get_mode,
> > +     .get_mode = s3fwrn5_phy_get_mode,
> >       .write = s3fwrn5_i2c_write,
> >  };
> >
> > @@ -128,7 +83,7 @@ static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
> >       char hdr[4];
> >       int ret;
> >
> > -     hdr_size = (phy->mode == S3FWRN5_MODE_NCI) ?
> > +     hdr_size = (phy->common.mode == S3FWRN5_MODE_NCI) ?
> >               NCI_CTRL_HDR_SIZE : S3FWRN5_FW_HDR_SIZE;
> >       ret = i2c_master_recv(phy->i2c_dev, hdr, hdr_size);
> >       if (ret < 0)
> > @@ -137,7 +92,7 @@ static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
> >       if (ret < hdr_size)
> >               return -EBADMSG;
> >
> > -     data_len = (phy->mode == S3FWRN5_MODE_NCI) ?
> > +     data_len = (phy->common.mode == S3FWRN5_MODE_NCI) ?
> >               ((struct nci_ctrl_hdr *)hdr)->plen :
> >               ((struct s3fwrn5_fw_header *)hdr)->len;
> >
> > @@ -157,24 +112,24 @@ static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
> >       }
> >
> >  out:
> > -     return s3fwrn5_recv_frame(phy->ndev, skb, phy->mode);
> > +     return s3fwrn5_recv_frame(phy->common.ndev, skb, phy->common.mode);
> >  }
> >
> >  static irqreturn_t s3fwrn5_i2c_irq_thread_fn(int irq, void *phy_id)
> >  {
> >       struct s3fwrn5_i2c_phy *phy = phy_id;
> >
> > -     if (!phy || !phy->ndev) {
> > +     if (!phy || !phy->common.ndev) {
> >               WARN_ON_ONCE(1);
> >               return IRQ_NONE;
> >       }
> >
> > -     mutex_lock(&phy->mutex);
> > +     mutex_lock(&phy->common.mutex);
> >
> >       if (phy->irq_skip)
> >               goto out;
> >
> > -     switch (phy->mode) {
> > +     switch (phy->common.mode) {
> >       case S3FWRN5_MODE_NCI:
> >       case S3FWRN5_MODE_FW:
> >               s3fwrn5_i2c_read(phy);
> > @@ -184,7 +139,7 @@ static irqreturn_t s3fwrn5_i2c_irq_thread_fn(int irq, void *phy_id)
> >       }
> >
> >  out:
> > -     mutex_unlock(&phy->mutex);
> > +     mutex_unlock(&phy->common.mutex);
> >
> >       return IRQ_HANDLED;
> >  }
> > @@ -197,19 +152,19 @@ static int s3fwrn5_i2c_parse_dt(struct i2c_client *client)
> >       if (!np)
> >               return -ENODEV;
> >
> > -     phy->gpio_en = of_get_named_gpio(np, "en-gpios", 0);
> > -     if (!gpio_is_valid(phy->gpio_en)) {
> > +     phy->common.gpio_en = of_get_named_gpio(np, "en-gpios", 0);
> > +     if (!gpio_is_valid(phy->common.gpio_en)) {
> >               /* Support also deprecated property */
> > -             phy->gpio_en = of_get_named_gpio(np, "s3fwrn5,en-gpios", 0);
> > -             if (!gpio_is_valid(phy->gpio_en))
> > +             phy->common.gpio_en = of_get_named_gpio(np, "s3fwrn5,en-gpios", 0);
> > +             if (!gpio_is_valid(phy->common.gpio_en))
> >                       return -ENODEV;
> >       }
> >
> > -     phy->gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0);
> > -     if (!gpio_is_valid(phy->gpio_fw_wake)) {
> > +     phy->common.gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0);
> > +     if (!gpio_is_valid(phy->common.gpio_fw_wake)) {
> >               /* Support also deprecated property */
> > -             phy->gpio_fw_wake = of_get_named_gpio(np, "s3fwrn5,fw-gpios", 0);
> > -             if (!gpio_is_valid(phy->gpio_fw_wake))
> > +             phy->common.gpio_fw_wake = of_get_named_gpio(np, "s3fwrn5,fw-gpios", 0);
>
> The lines here should wrap at 80 character.
>
> > +             if (!gpio_is_valid(phy->common.gpio_fw_wake))
> >                       return -ENODEV;
> >       }
> >
> > @@ -226,8 +181,8 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client,
> >       if (!phy)
> >               return -ENOMEM;
> >
> > -     mutex_init(&phy->mutex);
> > -     phy->mode = S3FWRN5_MODE_COLD;
> > +     mutex_init(&phy->common.mutex);
> > +     phy->common.mode = S3FWRN5_MODE_COLD;
> >       phy->irq_skip = true;
> >
> >       phy->i2c_dev = client;
> > @@ -237,17 +192,17 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client,
> >       if (ret < 0)
> >               return ret;
> >
> > -     ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_en,
> > -             GPIOF_OUT_INIT_HIGH, "s3fwrn5_en");
> > +     ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->common.gpio_en,
> > +                                 GPIOF_OUT_INIT_HIGH, "s3fwrn5_en");
> >       if (ret < 0)
> >               return ret;
> >
> > -     ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_fw_wake,
> > -             GPIOF_OUT_INIT_LOW, "s3fwrn5_fw_wake");
> > +     ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->common.gpio_fw_wake,
> > +                                 GPIOF_OUT_INIT_LOW, "s3fwrn5_fw_wake");
> >       if (ret < 0)
> >               return ret;
> >
> > -     ret = s3fwrn5_probe(&phy->ndev, phy, &phy->i2c_dev->dev, &i2c_phy_ops);
> > +     ret = s3fwrn5_probe(&phy->common.ndev, phy, &phy->i2c_dev->dev, &i2c_phy_ops);
>
> Please wrap the lines.
>
> >       if (ret < 0)
> >               return ret;
> >
> > @@ -255,7 +210,7 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client,
> >               s3fwrn5_i2c_irq_thread_fn, IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
> >               S3FWRN5_I2C_DRIVER_NAME, phy);
> >       if (ret)
> > -             s3fwrn5_remove(phy->ndev);
> > +             s3fwrn5_remove(phy->common.ndev);
> >
> >       return ret;
> >  }
> > @@ -264,7 +219,7 @@ static int s3fwrn5_i2c_remove(struct i2c_client *client)
> >  {
> >       struct s3fwrn5_i2c_phy *phy = i2c_get_clientdata(client);
> >
> > -     s3fwrn5_remove(phy->ndev);
> > +     s3fwrn5_remove(phy->common.ndev);
> >
> >       return 0;
> >  }
> > diff --git a/drivers/nfc/s3fwrn5/phy_common.h b/drivers/nfc/s3fwrn5/phy_common.h
> > new file mode 100644
> > index 0000000..14f7690
> > --- /dev/null
> > +++ b/drivers/nfc/s3fwrn5/phy_common.h
> > @@ -0,0 +1,86 @@
> > +/* SPDX-License-Identifier: GPL-2.0-or-later
> > + *
> > + * Link Layer for Samsung S3FWRN5 NCI based Driver
> > + *
> > + * Copyright (C) 2015 Samsung Electrnoics
> > + * Robert Baldyga <r.baldyga@samsung.com>
> > + * Copyright (C) 2020 Samsung Electrnoics
> > + * Bongsu Jeon <bongsu.jeon@samsung.com>
> > + */
> > +
> > +#ifndef __LOCAL_PHY_COMMON_H
> > +#define __LOCAL_PHY_COMMON_H
>
> Header guard: __NFC_S3FWRN5_PHY_COMMON_H
>
> > +
> > +#include "s3fwrn5.h"
>
> This include should not be needed.
>

Actually, I included this because of enum s3fwrn5_mode.
Do you think the following structure is good?

0. remove the '#include "s3fwrn5.h" and the common function's
definition in phy_common.h.
1. make phy_common.c that includes the common function's definition
and "s3fwrn5.h , phy_common.h".
2. i2c.c includes "s3fwrn5.h , phy_common.h".

> > +
> > +#define S3FWRN5_EN_WAIT_TIME 20
> > +
> > +struct phy_common {
> > +     struct nci_dev *ndev;
> > +
> > +     int gpio_en;
> > +     int gpio_fw_wake;
> > +
> > +     struct mutex mutex;
> > +
> > +     enum s3fwrn5_mode mode;
> > +};
> > +
> > +static inline void s3fwrn5_phy_set_wake(void *phy_id, bool wake)
> > +{
>
> All these should go to a C source file. If needed - GPL exported.
>
> > +     struct phy_common *phy = phy_id;
> > +
> > +     mutex_lock(&phy->mutex);
> > +     gpio_set_value(phy->gpio_fw_wake, wake);
> > +     msleep(S3FWRN5_EN_WAIT_TIME);
> > +     mutex_unlock(&phy->mutex);
> > +}
> > +
> > +static inline bool s3fwrn5_phy_power_ctrl(struct phy_common *phy,
> > +                                       enum s3fwrn5_mode mode)
> > +{
> > +     if (phy->mode == mode)
> > +             return false;
> > +
> > +     phy->mode = mode;
> > +
> > +     gpio_set_value(phy->gpio_en, 1);
> > +     gpio_set_value(phy->gpio_fw_wake, 0);
> > +     if (mode == S3FWRN5_MODE_FW)
> > +             gpio_set_value(phy->gpio_fw_wake, 1);
> > +
> > +     if (mode != S3FWRN5_MODE_COLD) {
> > +             msleep(S3FWRN5_EN_WAIT_TIME);
> > +             gpio_set_value(phy->gpio_en, 0);
> > +             msleep(S3FWRN5_EN_WAIT_TIME);
> > +     }
> > +
> > +     return true;
> > +}
> > +
> > +static inline void s3fwrn5_phy_set_mode(void *phy_id, enum s3fwrn5_mode mode)
> > +{
>
> This looks unused. If you need it only for your next chip, add it with
> next patch (the patch adding the user).
>
Okay I understand it.

> Best regards,
> Krzysztof

Re: [PATCH net-next 3/3] nfc: s3fwrn5: extract the common phy blocks

[Krzysztof Kozlowski]

On Fri, Nov 27, 2020 at 08:09:24AM +0900, Bongsu Jeon wrote:
> On Fri, Nov 27, 2020 at 2:13 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
> >
> > On Fri, Nov 27, 2020 at 12:33:39AM +0900, bongsu.jeon2@gmail.com wrote:
> > > From: Bongsu Jeon <bongsu.jeon@samsung.com>
> > >
> > > Extract the common phy blocks to reuse it.
> > > The UART module will use the common blocks.
> >
> >
> > Hi,
> >
> > Thanks for the patch. Few comments below.
> >
> > > Signed-off-by: Bongsu Jeon <bongsu.jeon@samsung.com>
> > > ---
> > >  drivers/nfc/s3fwrn5/i2c.c        | 111 ++++++++++++---------------------------
> > >  drivers/nfc/s3fwrn5/phy_common.h |  86 ++++++++++++++++++++++++++++++
> > >  2 files changed, 119 insertions(+), 78 deletions(-)
> > >  create mode 100644 drivers/nfc/s3fwrn5/phy_common.h
> > >
> > > diff --git a/drivers/nfc/s3fwrn5/i2c.c b/drivers/nfc/s3fwrn5/i2c.c
> > > index 9a64eea..cd1b2a7 100644
> > > --- a/drivers/nfc/s3fwrn5/i2c.c
> > > +++ b/drivers/nfc/s3fwrn5/i2c.c
> > > @@ -15,75 +15,30 @@
> > >
> > >  #include <net/nfc/nfc.h>
> > >
> > > -#include "s3fwrn5.h"
> > > +#include "phy_common.h"
> > >
> > >  #define S3FWRN5_I2C_DRIVER_NAME "s3fwrn5_i2c"
> > >
> > > -#define S3FWRN5_EN_WAIT_TIME 20
> > > -
> > >  struct s3fwrn5_i2c_phy {
> > > +     struct phy_common common;
> > >       struct i2c_client *i2c_dev;
> > > -     struct nci_dev *ndev;
> > > -
> > > -     int gpio_en;
> > > -     int gpio_fw_wake;
> > > -
> > > -     struct mutex mutex;
> > >
> > > -     enum s3fwrn5_mode mode;
> > >       unsigned int irq_skip:1;
> > >  };
> > >
> > > -static void s3fwrn5_i2c_set_wake(void *phy_id, bool wake)
> > > -{
> > > -     struct s3fwrn5_i2c_phy *phy = phy_id;
> > > -
> > > -     mutex_lock(&phy->mutex);
> > > -     gpio_set_value(phy->gpio_fw_wake, wake);
> > > -     msleep(S3FWRN5_EN_WAIT_TIME);
> > > -     mutex_unlock(&phy->mutex);
> > > -}
> > > -
> > >  static void s3fwrn5_i2c_set_mode(void *phy_id, enum s3fwrn5_mode mode)
> > >  {
> > >       struct s3fwrn5_i2c_phy *phy = phy_id;
> > >
> > > -     mutex_lock(&phy->mutex);
> > > +     mutex_lock(&phy->common.mutex);
> > >
> > > -     if (phy->mode == mode)
> > > +     if (s3fwrn5_phy_power_ctrl(&phy->common, mode) == false)
> > >               goto out;
> > >
> > > -     phy->mode = mode;
> > > -
> > > -     gpio_set_value(phy->gpio_en, 1);
> > > -     gpio_set_value(phy->gpio_fw_wake, 0);
> > > -     if (mode == S3FWRN5_MODE_FW)
> > > -             gpio_set_value(phy->gpio_fw_wake, 1);
> > > -
> > > -     if (mode != S3FWRN5_MODE_COLD) {
> > > -             msleep(S3FWRN5_EN_WAIT_TIME);
> > > -             gpio_set_value(phy->gpio_en, 0);
> > > -             msleep(S3FWRN5_EN_WAIT_TIME);
> > > -     }
> > > -
> > >       phy->irq_skip = true;
> > >
> > >  out:
> > > -     mutex_unlock(&phy->mutex);
> > > -}
> > > -
> > > -static enum s3fwrn5_mode s3fwrn5_i2c_get_mode(void *phy_id)
> > > -{
> > > -     struct s3fwrn5_i2c_phy *phy = phy_id;
> > > -     enum s3fwrn5_mode mode;
> > > -
> > > -     mutex_lock(&phy->mutex);
> > > -
> > > -     mode = phy->mode;
> > > -
> > > -     mutex_unlock(&phy->mutex);
> > > -
> > > -     return mode;
> > > +     mutex_unlock(&phy->common.mutex);
> > >  }
> > >
> > >  static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
> > > @@ -91,7 +46,7 @@ static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
> > >       struct s3fwrn5_i2c_phy *phy = phy_id;
> > >       int ret;
> > >
> > > -     mutex_lock(&phy->mutex);
> > > +     mutex_lock(&phy->common.mutex);
> > >
> > >       phy->irq_skip = false;
> > >
> > > @@ -102,7 +57,7 @@ static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
> > >               ret  = i2c_master_send(phy->i2c_dev, skb->data, skb->len);
> > >       }
> > >
> > > -     mutex_unlock(&phy->mutex);
> > > +     mutex_unlock(&phy->common.mutex);
> > >
> > >       if (ret < 0)
> > >               return ret;
> > > @@ -114,9 +69,9 @@ static int s3fwrn5_i2c_write(void *phy_id, struct sk_buff *skb)
> > >  }
> > >
> > >  static const struct s3fwrn5_phy_ops i2c_phy_ops = {
> > > -     .set_wake = s3fwrn5_i2c_set_wake,
> > > +     .set_wake = s3fwrn5_phy_set_wake,
> > >       .set_mode = s3fwrn5_i2c_set_mode,
> > > -     .get_mode = s3fwrn5_i2c_get_mode,
> > > +     .get_mode = s3fwrn5_phy_get_mode,
> > >       .write = s3fwrn5_i2c_write,
> > >  };
> > >
> > > @@ -128,7 +83,7 @@ static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
> > >       char hdr[4];
> > >       int ret;
> > >
> > > -     hdr_size = (phy->mode == S3FWRN5_MODE_NCI) ?
> > > +     hdr_size = (phy->common.mode == S3FWRN5_MODE_NCI) ?
> > >               NCI_CTRL_HDR_SIZE : S3FWRN5_FW_HDR_SIZE;
> > >       ret = i2c_master_recv(phy->i2c_dev, hdr, hdr_size);
> > >       if (ret < 0)
> > > @@ -137,7 +92,7 @@ static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
> > >       if (ret < hdr_size)
> > >               return -EBADMSG;
> > >
> > > -     data_len = (phy->mode == S3FWRN5_MODE_NCI) ?
> > > +     data_len = (phy->common.mode == S3FWRN5_MODE_NCI) ?
> > >               ((struct nci_ctrl_hdr *)hdr)->plen :
> > >               ((struct s3fwrn5_fw_header *)hdr)->len;
> > >
> > > @@ -157,24 +112,24 @@ static int s3fwrn5_i2c_read(struct s3fwrn5_i2c_phy *phy)
> > >       }
> > >
> > >  out:
> > > -     return s3fwrn5_recv_frame(phy->ndev, skb, phy->mode);
> > > +     return s3fwrn5_recv_frame(phy->common.ndev, skb, phy->common.mode);
> > >  }
> > >
> > >  static irqreturn_t s3fwrn5_i2c_irq_thread_fn(int irq, void *phy_id)
> > >  {
> > >       struct s3fwrn5_i2c_phy *phy = phy_id;
> > >
> > > -     if (!phy || !phy->ndev) {
> > > +     if (!phy || !phy->common.ndev) {
> > >               WARN_ON_ONCE(1);
> > >               return IRQ_NONE;
> > >       }
> > >
> > > -     mutex_lock(&phy->mutex);
> > > +     mutex_lock(&phy->common.mutex);
> > >
> > >       if (phy->irq_skip)
> > >               goto out;
> > >
> > > -     switch (phy->mode) {
> > > +     switch (phy->common.mode) {
> > >       case S3FWRN5_MODE_NCI:
> > >       case S3FWRN5_MODE_FW:
> > >               s3fwrn5_i2c_read(phy);
> > > @@ -184,7 +139,7 @@ static irqreturn_t s3fwrn5_i2c_irq_thread_fn(int irq, void *phy_id)
> > >       }
> > >
> > >  out:
> > > -     mutex_unlock(&phy->mutex);
> > > +     mutex_unlock(&phy->common.mutex);
> > >
> > >       return IRQ_HANDLED;
> > >  }
> > > @@ -197,19 +152,19 @@ static int s3fwrn5_i2c_parse_dt(struct i2c_client *client)
> > >       if (!np)
> > >               return -ENODEV;
> > >
> > > -     phy->gpio_en = of_get_named_gpio(np, "en-gpios", 0);
> > > -     if (!gpio_is_valid(phy->gpio_en)) {
> > > +     phy->common.gpio_en = of_get_named_gpio(np, "en-gpios", 0);
> > > +     if (!gpio_is_valid(phy->common.gpio_en)) {
> > >               /* Support also deprecated property */
> > > -             phy->gpio_en = of_get_named_gpio(np, "s3fwrn5,en-gpios", 0);
> > > -             if (!gpio_is_valid(phy->gpio_en))
> > > +             phy->common.gpio_en = of_get_named_gpio(np, "s3fwrn5,en-gpios", 0);
> > > +             if (!gpio_is_valid(phy->common.gpio_en))
> > >                       return -ENODEV;
> > >       }
> > >
> > > -     phy->gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0);
> > > -     if (!gpio_is_valid(phy->gpio_fw_wake)) {
> > > +     phy->common.gpio_fw_wake = of_get_named_gpio(np, "wake-gpios", 0);
> > > +     if (!gpio_is_valid(phy->common.gpio_fw_wake)) {
> > >               /* Support also deprecated property */
> > > -             phy->gpio_fw_wake = of_get_named_gpio(np, "s3fwrn5,fw-gpios", 0);
> > > -             if (!gpio_is_valid(phy->gpio_fw_wake))
> > > +             phy->common.gpio_fw_wake = of_get_named_gpio(np, "s3fwrn5,fw-gpios", 0);
> >
> > The lines here should wrap at 80 character.
> >
> > > +             if (!gpio_is_valid(phy->common.gpio_fw_wake))
> > >                       return -ENODEV;
> > >       }
> > >
> > > @@ -226,8 +181,8 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client,
> > >       if (!phy)
> > >               return -ENOMEM;
> > >
> > > -     mutex_init(&phy->mutex);
> > > -     phy->mode = S3FWRN5_MODE_COLD;
> > > +     mutex_init(&phy->common.mutex);
> > > +     phy->common.mode = S3FWRN5_MODE_COLD;
> > >       phy->irq_skip = true;
> > >
> > >       phy->i2c_dev = client;
> > > @@ -237,17 +192,17 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client,
> > >       if (ret < 0)
> > >               return ret;
> > >
> > > -     ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_en,
> > > -             GPIOF_OUT_INIT_HIGH, "s3fwrn5_en");
> > > +     ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->common.gpio_en,
> > > +                                 GPIOF_OUT_INIT_HIGH, "s3fwrn5_en");
> > >       if (ret < 0)
> > >               return ret;
> > >
> > > -     ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->gpio_fw_wake,
> > > -             GPIOF_OUT_INIT_LOW, "s3fwrn5_fw_wake");
> > > +     ret = devm_gpio_request_one(&phy->i2c_dev->dev, phy->common.gpio_fw_wake,
> > > +                                 GPIOF_OUT_INIT_LOW, "s3fwrn5_fw_wake");
> > >       if (ret < 0)
> > >               return ret;
> > >
> > > -     ret = s3fwrn5_probe(&phy->ndev, phy, &phy->i2c_dev->dev, &i2c_phy_ops);
> > > +     ret = s3fwrn5_probe(&phy->common.ndev, phy, &phy->i2c_dev->dev, &i2c_phy_ops);
> >
> > Please wrap the lines.
> >
> > >       if (ret < 0)
> > >               return ret;
> > >
> > > @@ -255,7 +210,7 @@ static int s3fwrn5_i2c_probe(struct i2c_client *client,
> > >               s3fwrn5_i2c_irq_thread_fn, IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
> > >               S3FWRN5_I2C_DRIVER_NAME, phy);
> > >       if (ret)
> > > -             s3fwrn5_remove(phy->ndev);
> > > +             s3fwrn5_remove(phy->common.ndev);
> > >
> > >       return ret;
> > >  }
> > > @@ -264,7 +219,7 @@ static int s3fwrn5_i2c_remove(struct i2c_client *client)
> > >  {
> > >       struct s3fwrn5_i2c_phy *phy = i2c_get_clientdata(client);
> > >
> > > -     s3fwrn5_remove(phy->ndev);
> > > +     s3fwrn5_remove(phy->common.ndev);
> > >
> > >       return 0;
> > >  }
> > > diff --git a/drivers/nfc/s3fwrn5/phy_common.h b/drivers/nfc/s3fwrn5/phy_common.h
> > > new file mode 100644
> > > index 0000000..14f7690
> > > --- /dev/null
> > > +++ b/drivers/nfc/s3fwrn5/phy_common.h
> > > @@ -0,0 +1,86 @@
> > > +/* SPDX-License-Identifier: GPL-2.0-or-later
> > > + *
> > > + * Link Layer for Samsung S3FWRN5 NCI based Driver
> > > + *
> > > + * Copyright (C) 2015 Samsung Electrnoics
> > > + * Robert Baldyga <r.baldyga@samsung.com>
> > > + * Copyright (C) 2020 Samsung Electrnoics
> > > + * Bongsu Jeon <bongsu.jeon@samsung.com>
> > > + */
> > > +
> > > +#ifndef __LOCAL_PHY_COMMON_H
> > > +#define __LOCAL_PHY_COMMON_H
> >
> > Header guard: __NFC_S3FWRN5_PHY_COMMON_H
> >
> > > +
> > > +#include "s3fwrn5.h"
> >
> > This include should not be needed.
> >
> 
> Actually, I included this because of enum s3fwrn5_mode.
> Do you think the following structure is good?
> 
> 0. remove the '#include "s3fwrn5.h" and the common function's
> definition in phy_common.h.
> 1. make phy_common.c that includes the common function's definition
> and "s3fwrn5.h , phy_common.h".
> 2. i2c.c includes "s3fwrn5.h , phy_common.h".

It looks like you already sent v2... I'll skip answering here then.

Best regards,
Krzysztof

Re: [PATCH net-next 1/3] nfc: s3fwrn5: use signed integer for parsing GPIO numbers

[Krzysztof Kozlowski]

On Fri, Nov 27, 2020 at 12:33:37AM +0900, bongsu.jeon2@gmail.com wrote:
> From: Krzysztof Kozlowski <krzk@kernel.org>
> 
> GPIOs - as returned by of_get_named_gpio() and used by the gpiolib - are
> signed integers, where negative number indicates error.  The return
> value of of_get_named_gpio() should not be assigned to an unsigned int
> because in case of !CONFIG_GPIOLIB such number would be a valid GPIO.
> 
> Fixes: c04c674fadeb ("nfc: s3fwrn5: Add driver for Samsung S3FWRN5 NFC Chip")
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

Why do you send my patch?

Best regards,
Krzysztof

Re: [PATCH net-next 1/3] nfc: s3fwrn5: use signed integer for parsing GPIO numbers

[Bongsu Jeon]

On Fri, Nov 27, 2020 at 2:06 AM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> On Fri, Nov 27, 2020 at 12:33:37AM +0900, bongsu.jeon2@gmail.com wrote:
> > From: Krzysztof Kozlowski <krzk@kernel.org>
> >
> > GPIOs - as returned by of_get_named_gpio() and used by the gpiolib - are
> > signed integers, where negative number indicates error.  The return
> > value of of_get_named_gpio() should not be assigned to an unsigned int
> > because in case of !CONFIG_GPIOLIB such number would be a valid GPIO.
> >
> > Fixes: c04c674fadeb ("nfc: s3fwrn5: Add driver for Samsung S3FWRN5 NFC Chip")
> > Cc: <stable@vger.kernel.org>
> > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
>
> Why do you send my patch?
>

I think that your patch should be applied before refactoring for this driver.
So, I applied your patch to net-next branch and included your patch at
my patch list.
Is this the wrong process?

> Best regards,
> Krzysztof

Re: [PATCH net-next 1/3] nfc: s3fwrn5: use signed integer for parsing GPIO numbers

[Bongsu Jeon]

On 11/27/20, Bongsu Jeon <bs.jeon87@gmail.com> wrote:
> On Fri, Nov 27, 2020 at 2:06 AM Krzysztof Kozlowski <krzk@kernel.org>
> wrote:
>>
>> On Fri, Nov 27, 2020 at 12:33:37AM +0900, bongsu.jeon2@gmail.com wrote:
>> > From: Krzysztof Kozlowski <krzk@kernel.org>
>> >
>> > GPIOs - as returned by of_get_named_gpio() and used by the gpiolib -
>> > are
>> > signed integers, where negative number indicates error.  The return
>> > value of of_get_named_gpio() should not be assigned to an unsigned int
>> > because in case of !CONFIG_GPIOLIB such number would be a valid GPIO.
>> >
>> > Fixes: c04c674fadeb ("nfc: s3fwrn5: Add driver for Samsung S3FWRN5 NFC
>> > Chip")
>> > Cc: <stable@vger.kernel.org>
>> > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
>>
>> Why do you send my patch?
>>
>
> I think that your patch should be applied before refactoring for this
> driver.
> So, I applied your patch to net-next branch and included your patch at
> my patch list.
> Is this the wrong process?
>

Sorry to confuse you.
I found your patch when i updated my workspace using git pull.

>> Best regards,
>> Krzysztof
>