diff options
Diffstat (limited to 'drivers/spi/spi.c')
| -rw-r--r-- | drivers/spi/spi.c | 86 |
1 files changed, 68 insertions, 18 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 1564914930d8..cd3c395b4e90 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -821,18 +821,16 @@ static void spi_set_cs(struct spi_device *spi, bool enable) enable = !enable; if (spi->cs_gpiod || gpio_is_valid(spi->cs_gpio)) { - /* - * Honour the SPI_NO_CS flag and invert the enable line, as - * active low is default for SPI. Execution paths that handle - * polarity inversion in gpiolib (such as device tree) will - * enforce active high using the SPI_CS_HIGH resulting in a - * double inversion through the code above. - */ if (!(spi->mode & SPI_NO_CS)) { if (spi->cs_gpiod) + /* polarity handled by gpiolib */ gpiod_set_value_cansleep(spi->cs_gpiod, - !enable); + enable1); else + /* + * invert the enable line, as active low is + * default for SPI. + */ gpio_set_value_cansleep(spi->cs_gpio, !enable); } /* Some SPI masters need both GPIO CS & slave_select */ @@ -2001,15 +1999,6 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi, } spi->chip_select = value; - /* - * For descriptors associated with the device, polarity inversion is - * handled in the gpiolib, so all gpio chip selects are "active high" - * in the logical sense, the gpiolib will invert the line if need be. - */ - if ((ctlr->use_gpio_descriptors) && ctlr->cs_gpiods && - ctlr->cs_gpiods[spi->chip_select]) - spi->mode |= SPI_CS_HIGH; - /* Device speed */ if (!of_property_read_u32(nc, "spi-max-frequency", &value)) spi->max_speed_hz = value; @@ -2462,6 +2451,49 @@ struct spi_controller *__spi_alloc_controller(struct device *dev, } EXPORT_SYMBOL_GPL(__spi_alloc_controller); +static void devm_spi_release_controller(struct device *dev, void *ctlr) +{ + spi_controller_put(*(struct spi_controller **)ctlr); +} + +/** + * __devm_spi_alloc_controller - resource-managed __spi_alloc_controller() + * @dev: physical device of SPI controller + * @size: how much zeroed driver-private data to allocate + * @slave: whether to allocate an SPI master (false) or SPI slave (true) + * Context: can sleep + * + * Allocate an SPI controller and automatically release a reference on it + * when @dev is unbound from its driver. Drivers are thus relieved from + * having to call spi_controller_put(). + * + * The arguments to this function are identical to __spi_alloc_controller(). + * + * Return: the SPI controller structure on success, else NULL. + */ +struct spi_controller *__devm_spi_alloc_controller(struct device *dev, + unsigned int size, + bool slave) +{ + struct spi_controller **ptr, *ctlr; + + ptr = devres_alloc(devm_spi_release_controller, sizeof(*ptr), + GFP_KERNEL); + if (!ptr) + return NULL; + + ctlr = __spi_alloc_controller(dev, size, slave); + if (ctlr) { + *ptr = ctlr; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return ctlr; +} +EXPORT_SYMBOL_GPL(__devm_spi_alloc_controller); + #ifdef CONFIG_OF static int of_spi_get_gpio_numbers(struct spi_controller *ctlr) { @@ -2798,6 +2830,11 @@ int devm_spi_register_controller(struct device *dev, } EXPORT_SYMBOL_GPL(devm_spi_register_controller); +static int devm_spi_match_controller(struct device *dev, void *res, void *ctlr) +{ + return *(struct spi_controller **)res == ctlr; +} + static int __unregister(struct device *dev, void *null) { spi_unregister_device(to_spi_device(dev)); @@ -2839,7 +2876,15 @@ void spi_unregister_controller(struct spi_controller *ctlr) list_del(&ctlr->list); mutex_unlock(&board_lock); - device_unregister(&ctlr->dev); + device_del(&ctlr->dev); + + /* Release the last reference on the controller if its driver + * has not yet been converted to devm_spi_alloc_master/slave(). + */ + if (!devres_find(ctlr->dev.parent, devm_spi_release_controller, + devm_spi_match_controller, ctlr)) + put_device(&ctlr->dev); + /* free bus id */ mutex_lock(&board_lock); if (found == ctlr) @@ -3336,12 +3381,15 @@ int spi_setup(struct spi_device *spi) if (!spi->max_speed_hz) spi->max_speed_hz = spi->controller->max_speed_hz; + mutex_lock(&spi->controller->io_mutex); + if (spi->controller->setup) status = spi->controller->setup(spi); if (spi->controller->auto_runtime_pm && spi->controller->set_cs) { status = pm_runtime_get_sync(spi->controller->dev.parent); if (status < 0) { + mutex_unlock(&spi->controller->io_mutex); pm_runtime_put_noidle(spi->controller->dev.parent); dev_err(&spi->controller->dev, "Failed to power device: %d\n", status); @@ -3363,6 +3411,8 @@ int spi_setup(struct spi_device *spi) spi_set_cs(spi, false); } + mutex_unlock(&spi->controller->io_mutex); + if (spi->rt && !spi->controller->rt) { spi->controller->rt = true; spi_set_thread_rt(spi->controller); |