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Since each I2C/SPI probe function can modify sc16is7xx_regcfg at the same time, change structure to be constant and do the required modifications on a local copy. Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com> Reviewed-by: Andy Shevchenko <andy@kernel.org> Link: https://lore.kernel.org/r/20240409154253.3043822-6-hugo@hugovil.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/* SC16IS7xx SPI interface driver */
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#include <linux/dev_printk.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#include <linux/string.h>
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#include <linux/units.h>
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#include "sc16is7xx.h"
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/* SPI definitions */
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#define SC16IS7XX_SPI_READ_BIT BIT(7)
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static int sc16is7xx_spi_probe(struct spi_device *spi)
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{
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const struct sc16is7xx_devtype *devtype;
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struct regmap *regmaps[SC16IS7XX_MAX_PORTS];
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struct regmap_config regcfg;
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unsigned int i;
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int ret;
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/* Setup SPI bus */
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spi->bits_per_word = 8;
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/* For all variants, only mode 0 is supported */
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if ((spi->mode & SPI_MODE_X_MASK) != SPI_MODE_0)
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return dev_err_probe(&spi->dev, -EINVAL, "Unsupported SPI mode\n");
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spi->mode = spi->mode ? : SPI_MODE_0;
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spi->max_speed_hz = spi->max_speed_hz ? : 4 * HZ_PER_MHZ;
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ret = spi_setup(spi);
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if (ret)
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return ret;
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devtype = spi_get_device_match_data(spi);
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if (!devtype)
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return dev_err_probe(&spi->dev, -ENODEV, "Failed to match device\n");
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memcpy(®cfg, &sc16is7xx_regcfg, sizeof(struct regmap_config));
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for (i = 0; i < devtype->nr_uart; i++) {
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regcfg.name = sc16is7xx_regmap_name(i);
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/*
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* If read_flag_mask is 0, the regmap code sets it to a default
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* of 0x80. Since we specify our own mask, we must add the READ
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* bit ourselves:
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*/
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regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i) |
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SC16IS7XX_SPI_READ_BIT;
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regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i);
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regmaps[i] = devm_regmap_init_spi(spi, ®cfg);
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}
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return sc16is7xx_probe(&spi->dev, devtype, regmaps, spi->irq);
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}
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static void sc16is7xx_spi_remove(struct spi_device *spi)
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{
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sc16is7xx_remove(&spi->dev);
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}
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static const struct spi_device_id sc16is7xx_spi_id_table[] = {
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{ "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, },
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{ "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, },
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{ "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, },
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{ "sc16is750", (kernel_ulong_t)&sc16is750_devtype, },
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{ "sc16is752", (kernel_ulong_t)&sc16is752_devtype, },
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{ "sc16is760", (kernel_ulong_t)&sc16is760_devtype, },
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{ "sc16is762", (kernel_ulong_t)&sc16is762_devtype, },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, sc16is7xx_spi_id_table);
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static struct spi_driver sc16is7xx_spi_driver = {
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.driver = {
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.name = SC16IS7XX_NAME,
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.of_match_table = sc16is7xx_dt_ids,
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},
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.probe = sc16is7xx_spi_probe,
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.remove = sc16is7xx_spi_remove,
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.id_table = sc16is7xx_spi_id_table,
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};
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module_spi_driver(sc16is7xx_spi_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SC16IS7xx SPI interface driver");
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MODULE_IMPORT_NS(SERIAL_NXP_SC16IS7XX);
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