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Date: Sat, 28 Nov 2020 12:45:55 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Bongsu Jeon <bongsu.jeon2@...il.com>
Cc: k.opasiak@...sung.com, linux-nfc@...ts.01.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
Bongsu Jeon <bongsu.jeon@...sung.com>
Subject: Re: [PATCH net-next 3/3] nfc: s3fwrn5: extract the common phy blocks
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@...nel.org> wrote:
> >
> > On Fri, Nov 27, 2020 at 12:33:39AM +0900, bongsu.jeon2@...il.com wrote:
> > > From: Bongsu Jeon <bongsu.jeon@...sung.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@...sung.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@...sung.com>
> > > + * Copyright (C) 2020 Samsung Electrnoics
> > > + * Bongsu Jeon <bongsu.jeon@...sung.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
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