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1// SPDX-License-Identifier: GPL-2.0+2/* SC16IS7xx SPI interface driver */3 4#include <linux/dev_printk.h>5#include <linux/mod_devicetable.h>6#include <linux/module.h>7#include <linux/regmap.h>8#include <linux/spi/spi.h>9#include <linux/string.h>10#include <linux/units.h>11 12#include "sc16is7xx.h"13 14/* SPI definitions */15#define SC16IS7XX_SPI_READ_BIT BIT(7)16 17static int sc16is7xx_spi_probe(struct spi_device *spi)18{19 const struct sc16is7xx_devtype *devtype;20 struct regmap *regmaps[SC16IS7XX_MAX_PORTS];21 struct regmap_config regcfg;22 unsigned int i;23 int ret;24 25 /* Setup SPI bus */26 spi->bits_per_word = 8;27 /* For all variants, only mode 0 is supported */28 if ((spi->mode & SPI_MODE_X_MASK) != SPI_MODE_0)29 return dev_err_probe(&spi->dev, -EINVAL, "Unsupported SPI mode\n");30 31 spi->mode = spi->mode ? : SPI_MODE_0;32 spi->max_speed_hz = spi->max_speed_hz ? : 4 * HZ_PER_MHZ;33 ret = spi_setup(spi);34 if (ret)35 return ret;36 37 devtype = spi_get_device_match_data(spi);38 if (!devtype)39 return dev_err_probe(&spi->dev, -ENODEV, "Failed to match device\n");40 41 memcpy(®cfg, &sc16is7xx_regcfg, sizeof(struct regmap_config));42 43 for (i = 0; i < devtype->nr_uart; i++) {44 regcfg.name = sc16is7xx_regmap_name(i);45 /*46 * If read_flag_mask is 0, the regmap code sets it to a default47 * of 0x80. Since we specify our own mask, we must add the READ48 * bit ourselves:49 */50 regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i) |51 SC16IS7XX_SPI_READ_BIT;52 regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i);53 regmaps[i] = devm_regmap_init_spi(spi, ®cfg);54 }55 56 return sc16is7xx_probe(&spi->dev, devtype, regmaps, spi->irq);57}58 59static void sc16is7xx_spi_remove(struct spi_device *spi)60{61 sc16is7xx_remove(&spi->dev);62}63 64static const struct spi_device_id sc16is7xx_spi_id_table[] = {65 { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, },66 { "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, },67 { "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, },68 { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, },69 { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, },70 { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, },71 { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, },72 { }73};74MODULE_DEVICE_TABLE(spi, sc16is7xx_spi_id_table);75 76static struct spi_driver sc16is7xx_spi_driver = {77 .driver = {78 .name = SC16IS7XX_NAME,79 .of_match_table = sc16is7xx_dt_ids,80 },81 .probe = sc16is7xx_spi_probe,82 .remove = sc16is7xx_spi_remove,83 .id_table = sc16is7xx_spi_id_table,84};85 86module_spi_driver(sc16is7xx_spi_driver);87 88MODULE_LICENSE("GPL");89MODULE_DESCRIPTION("SC16IS7xx SPI interface driver");90MODULE_IMPORT_NS(SERIAL_NXP_SC16IS7XX);91