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Message-ID: <CAMhs-H_uTC+j+nza5_ZMG04b52un8wnemM6qVi1Les++7_m96g@mail.gmail.com>
Date: Thu, 17 Jan 2019 10:49:44 +0100
From: Sergio Paracuellos <sergio.paracuellos@...il.com>
To: Tristram.Ha@...rochip.com
Cc: Marek Vasut <marex@...x.de>, Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Pavel Machek <pavel@....cz>,
Dan Carpenter <dan.carpenter@...cle.com>,
vivien.didelot@...oirfairelinux.com, UNGLinuxDriver@...rochip.com,
netdev@...r.kernel.org
Subject: Re: [PATCH RFC v1] net: dsa: microchip: add KSZ9477 I2C driver
On Thu, Jan 17, 2019 at 10:36 AM Sergio Paracuellos
<sergio.paracuellos@...il.com> wrote:
>
> On Thu, Jan 17, 2019 at 4:24 AM <Tristram.Ha@...rochip.com> wrote:
> >
> > From: Tristram Ha <Tristram.Ha@...rochip.com>
> >
> > Add KSZ9477 I2C driver support. The code ksz9477.c and ksz_common.c are
> > used together to generate the I2C driver.
> >
> > Signed-off-by: Tristram Ha <Tristram.Ha@...rochip.com>
> > ---
> > drivers/net/dsa/microchip/Kconfig | 7 ++
> > drivers/net/dsa/microchip/Makefile | 1 +
> > drivers/net/dsa/microchip/ksz9477_i2c.c | 120 ++++++++++++++++++++++++++++++++
> > 3 files changed, 128 insertions(+)
> > create mode 100644 drivers/net/dsa/microchip/ksz9477_i2c.c
> >
> > diff --git a/drivers/net/dsa/microchip/Kconfig b/drivers/net/dsa/microchip/Kconfig
> > index 385b93f..1798755 100644
> > --- a/drivers/net/dsa/microchip/Kconfig
> > +++ b/drivers/net/dsa/microchip/Kconfig
> > @@ -9,6 +9,13 @@ menuconfig NET_DSA_MICROCHIP_KSZ9477
> > help
> > This driver adds support for Microchip KSZ9477 switch chips.
> >
> > +config NET_DSA_MICROCHIP_KSZ9477_I2C
> > + tristate "KSZ9477 series I2C connected switch driver"
> > + depends on NET_DSA_MICROCHIP_KSZ9477 && I2C
> > + select REGMAP_I2C
> > + help
> > + Select to enable support for registering switches configured through I2C.
> > +
> > config NET_DSA_MICROCHIP_KSZ9477_SPI
> > tristate "KSZ9477 series SPI connected switch driver"
> > depends on NET_DSA_MICROCHIP_KSZ9477 && SPI
> > diff --git a/drivers/net/dsa/microchip/Makefile b/drivers/net/dsa/microchip/Makefile
> > index 3142c18..dbcc5db 100644
> > --- a/drivers/net/dsa/microchip/Makefile
> > +++ b/drivers/net/dsa/microchip/Makefile
> > @@ -1,3 +1,4 @@
> > obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ_COMMON) += ksz_common.o
> > obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ9477) += ksz9477.o
> > +obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ9477_I2C) += ksz9477_i2c.o
> > obj-$(CONFIG_NET_DSA_MICROCHIP_KSZ9477_SPI) += ksz9477_spi.o
> > diff --git a/drivers/net/dsa/microchip/ksz9477_i2c.c b/drivers/net/dsa/microchip/ksz9477_i2c.c
> > new file mode 100644
> > index 0000000..d8720ff
> > --- /dev/null
> > +++ b/drivers/net/dsa/microchip/ksz9477_i2c.c
> > @@ -0,0 +1,120 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Microchip KSZ9477 series register access through I2C
> > + *
> > + * Copyright (C) 2018-2019 Microchip Technology Inc.
> > + */
> > +
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/i2c.h>
> > +
> > +#include "ksz_priv.h"
> > +
> > +#define REG_SIZE 0x8000
> > +
> > +#define I2C_REGMAP_VAL 8
> > +#define I2C_REGMAP_REG 16
> > +
> > +#define KSZ_REGMAP_COMMON(n, width) \
> > +{ \
> > + .name = n, \
> > + .max_register = REG_SIZE - (width), \
> > + .reg_bits = I2C_REGMAP_REG, \
> > + .val_bits = I2C_REGMAP_VAL * (width), \
> > + .reg_stride = (width), \
> > + .reg_format_endian = REGMAP_ENDIAN_BIG, \
> > + .val_format_endian = REGMAP_ENDIAN_BIG, \
> > +}
> > +
> > +static const struct regmap_config ksz9477_regmap_cfg[] = {
> > + KSZ_REGMAP_COMMON("8", 1),
> > + KSZ_REGMAP_COMMON("16", 2),
> > + KSZ_REGMAP_COMMON("32", 4),
> > +};
> > +
> > +static int ksz9477_i2c_probe(struct i2c_client *i2c,
> > + const struct i2c_device_id *i2c_id)
> > +{
> > + struct ksz_device *dev;
> > + int i;
> > + int ret;
> > +
> > + dev = ksz_switch_alloc(&i2c->dev);
> > + if (!dev)
> > + return -ENOMEM;
> > +
> > + for (i = 0; i < ARRAY_SIZE(ksz9477_regmap_cfg); i++) {
> > + dev->regmap[i] = devm_regmap_init_i2c(i2c,
> > + &ksz9477_regmap_cfg[i]);
> > + if (IS_ERR(dev->regmap[i])) {
> > + ret = PTR_ERR(dev->regmap[i]);
> > + dev_err(&i2c->dev, "Failed to initialize regmap: %d\n",
> > + ret);
> > + return ret;
> > + }
> > + }
> > +
> > + if (i2c->dev.platform_data)
> > + dev->pdata = i2c->dev.platform_data;
> > +
> > + ret = ksz9477_switch_register(dev);
> > +
> > + /* Main DSA driver may not be started yet. */
> > + if (ret)
> > + return ret;
> > +
> > + i2c_set_clientdata(i2c, dev);
> > +
> > + return 0;
> > +}
> > +
> > +static int ksz9477_i2c_remove(struct i2c_client *i2c)
> > +{
> > + struct ksz_device *dev = i2c_get_clientdata(i2c);
> > +
> > + if (dev)
> > + ksz_switch_remove(dev);
> > +
> > + return 0;
> > +}
> > +
> > +static void ksz9477_i2c_shutdown(struct i2c_client *i2c)
> > +{
> > + struct ksz_device *dev = i2c_get_clientdata(i2c);
> > +
> > + if (dev && dev->dev_ops->shutdown)
> > + dev->dev_ops->shutdown(dev);
> > +}
> > +
> > +static const struct i2c_device_id ksz9477_i2c_id[] = {
> > + { "ksz9477-switch", 0 },
> > + {},
> > +};
> > +
> > +MODULE_DEVICE_TABLE(i2c, ksz9477_i2c_id);
> > +
> > +static const struct of_device_id ksz9477_dt_ids[] = {
> > + { .compatible = "microchip,ksz9477" },
> > + { .compatible = "microchip,ksz9897" },
> > + {},
> > +};
> > +MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
> > +
> > +static struct i2c_driver ksz9477_i2c_driver = {
> > + .driver = {
> > + .name = "ksz9477-switch",
> > + .owner = THIS_MODULE,
> > + .of_match_table = of_match_ptr(ksz9477_dt_ids),
> > + },
> > + .probe = ksz9477_i2c_probe,
> > + .remove = ksz9477_i2c_remove,
> > + .shutdown = ksz9477_i2c_shutdown,
> > + .id_table = ksz9477_i2c_id,
> > +};
> > +
> > +module_i2c_driver(ksz9477_i2c_driver);
> > +
> > +MODULE_AUTHOR("Tristram Ha <Tristram.Ha@...rochip.com>");
> > +MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch I2C Driver");
> > +MODULE_LICENSE("GPL v2");
> > --
> > 1.9.1
> >
> I have to make use of the microchip regs_bin utility and one extra
> patch to provide access to switch registers through
> /sys/bus/i2c/devices/0-005f/registers file because I need to configure
> master direct mode with sgmii which is not supported yet by this
> driver but the i2c interface using regmap as it is here works for me.
> So you can add my:
>
> Tested-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
>
> Best regards,
> Sergio Paracuellos
I forgot to mention that I have tested this on KSZ9897S switch.
Best regards,
Sergio Paracuellos
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