---------------------------------------- > From: indrakanti_ram@xxxxxxxxxxx > To: linux-serial@xxxxxxxxxxxxxxx > CC: moorray3@xxxxx; indrakanti_ram@xxxxxxxxxxx > Subject: [PATCH] sc16is7xx: spi interface is added. > Date: Mon, 11 May 2015 11:04:28 +0530 > CC to the maintainers is missing, adding them up.... > spi interface for sc16is7xx is added along with Kconfig flag > to enable spi or i2c, thus in a instance we can have either > spi or i2c, in sync to the hw. > > Signed-off-by: ram.i hcltech <indrakanti_ram@xxxxxxxxxxx> > --- > drivers/tty/serial/Kconfig | 10 ++++++ > drivers/tty/serial/sc16is7xx.c | 70 +++++++++++++++++++++++++++++++++++++++++- > 2 files changed, 79 insertions(+), 1 deletion(-) > > diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig > index f8120c1..10e41b2 100644 > --- a/drivers/tty/serial/Kconfig > +++ b/drivers/tty/serial/Kconfig > @@ -1189,6 +1189,16 @@ config SERIAL_SC16IS7XX > Supported ICs are SC16IS740, SC16IS741, SC16IS750, SC16IS752, > SC16IS760 and SC16IS762. > > +config SERIAL_SC16IS7XX_SPI > + bool "SC16IS7xx for spi interface" > + depends on SERIAL_SC16IS7XX > + depends on SPI_MASTER > + select REGMAP_SPI if SPI_MASTER > + help > + to enable spi interface for SC16IS7XX, say Y, > + Otherwise, for i2c say N. > + this would make driver to interface with spi or i2c. > + > config SERIAL_BFIN_SPORT > tristate "Blackfin SPORT emulate UART" > depends on BLACKFIN > diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c > index 468354e..b67a654 100644 > --- a/drivers/tty/serial/sc16is7xx.c > +++ b/drivers/tty/serial/sc16is7xx.c > @@ -25,6 +25,7 @@ > #include <linux/serial.h> > #include <linux/tty.h> > #include <linux/tty_flip.h> > +#include <linux/spi/spi.h> > #include <linux/uaccess.h> > > #define SC16IS7XX_NAME "sc16is7xx" > @@ -1204,6 +1205,71 @@ static struct regmap_config regcfg = { > .precious_reg = sc16is7xx_regmap_precious, > }; > > +#ifdef CONFIG_SERIAL_SC16IS7XX_SPI > +static int sc16is7xx_spi_probe(struct spi_device *spi) > +{ > + struct sc16is7xx_devtype *devtype; > + unsigned long flags = 0; > + struct regmap *regmap; > + int ret; > + > + /* Setup SPI bus */ > + spi->bits_per_word = 8; > + /*only supports mode 0 on SC16IS762*/ > + spi->mode = spi->mode ? : SPI_MODE_0; > + spi->max_speed_hz = spi->max_speed_hz ? : 15000000; > + ret = spi_setup(spi); > + if (ret) > + return ret; > + > + if (spi->dev.of_node) { > + const struct of_device_id *of_id = > + of_match_device(sc16is7xx_dt_ids, &spi->dev); > + > + devtype = (struct sc16is7xx_devtype *)of_id->data; > + } else { > + const struct spi_device_id *id_entry = spi_get_device_id(spi); > + > + devtype = (struct sc16is7xx_devtype *)id_entry->driver_data; > + flags = IRQF_TRIGGER_FALLING; > + } > + > + regcfg.max_register = (0xf << SC16IS7XX_REG_SHIFT) | > + (devtype->nr_uart - 1); > + regmap = devm_regmap_init_spi(spi, ®cfg); > + > + return sc16is7xx_probe(&spi->dev, devtype, regmap, spi->irq, flags); > +} > + > +static int sc16is7xx_spi_remove(struct spi_device *spi) > +{ > + return sc16is7xx_remove(&spi->dev); > +} > + > +static const struct spi_device_id sc16is7xx_spi_id_table[] = { > + { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, }, > + { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, }, > + { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, }, > + { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, }, > + { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, }, > + { } > +}; > + > +MODULE_DEVICE_TABLE(spi, sc16is7xx_spi_id_table); > + > +static struct spi_driver sc16is7xx_spi_uart_driver = { > + .driver = { > + .name = SC16IS7XX_NAME, > + .owner = THIS_MODULE, > + .of_match_table = of_match_ptr(sc16is7xx_dt_ids), > + }, > + .probe = sc16is7xx_spi_probe, > + .remove = sc16is7xx_spi_remove, > + .id_table = sc16is7xx_spi_id_table, > +}; > +module_spi_driver(sc16is7xx_spi_uart_driver); > + > +#else > static int sc16is7xx_i2c_probe(struct i2c_client *i2c, > const struct i2c_device_id *id) > { > @@ -1253,8 +1319,10 @@ static struct i2c_driver sc16is7xx_i2c_uart_driver = { > .remove = sc16is7xx_i2c_remove, > .id_table = sc16is7xx_i2c_id_table, > }; > + > module_i2c_driver(sc16is7xx_i2c_uart_driver); > -MODULE_ALIAS("i2c:sc16is7xx"); > +#endif > +MODULE_ALIAS("i2c/spi:sc16is7xx"); > > MODULE_LICENSE("GPL"); > MODULE_AUTHOR("Jon Ringle <jringle@xxxxxxxxxxxxx>"); > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html