diff options
Diffstat (limited to 'drivers/spi/spi.c')
| -rw-r--r-- | drivers/spi/spi.c | 36 |
1 files changed, 33 insertions, 3 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index e2415be209d5..2ae1588babd6 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -84,8 +84,7 @@ static ssize_t spi_device_##field##_show(struct device *dev, \ struct device_attribute *attr, \ char *buf) \ { \ - struct spi_device *spi = container_of(dev, \ - struct spi_device, dev); \ + struct spi_device *spi = to_spi_device(dev); \ return spi_statistics_##field##_show(&spi->statistics, buf); \ } \ static struct device_attribute dev_attr_spi_device_##field = { \ @@ -376,6 +375,7 @@ static void spi_drv_shutdown(struct device *dev) /** * __spi_register_driver - register a SPI driver + * @owner: owner module of the driver to register * @sdrv: the driver to register * Context: can sleep * @@ -604,6 +604,24 @@ struct spi_device *spi_new_device(struct spi_master *master, } EXPORT_SYMBOL_GPL(spi_new_device); +/** + * spi_unregister_device - unregister a single SPI device + * @spi: spi_device to unregister + * + * Start making the passed SPI device vanish. Normally this would be handled + * by spi_unregister_master(). + */ +void spi_unregister_device(struct spi_device *spi) +{ + if (!spi) + return; + + if (spi->dev.of_node) + of_node_clear_flag(spi->dev.of_node, OF_POPULATED); + device_unregister(&spi->dev); +} +EXPORT_SYMBOL_GPL(spi_unregister_device); + static void spi_match_master_to_boardinfo(struct spi_master *master, struct spi_board_info *bi) { @@ -1547,6 +1565,8 @@ static void of_register_spi_devices(struct spi_master *master) return; for_each_available_child_of_node(master->dev.of_node, nc) { + if (of_node_test_and_set_flag(nc, OF_POPULATED)) + continue; spi = of_register_spi_device(master, nc); if (IS_ERR(spi)) dev_warn(&master->dev, "Failed to create SPI device for %s\n", @@ -1704,7 +1724,7 @@ struct spi_master *spi_alloc_master(struct device *dev, unsigned size) master->bus_num = -1; master->num_chipselect = 1; master->dev.class = &spi_master_class; - master->dev.parent = get_device(dev); + master->dev.parent = dev; spi_master_set_devdata(master, &master[1]); return master; @@ -2130,6 +2150,7 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message) * Set transfer tx_nbits and rx_nbits as single transfer default * (SPI_NBITS_SINGLE) if it is not set for this transfer. */ + message->frame_length = 0; list_for_each_entry(xfer, &message->transfers, transfer_list) { message->frame_length += xfer->len; if (!xfer->bits_per_word) @@ -2631,6 +2652,11 @@ static int of_spi_notify(struct notifier_block *nb, unsigned long action, if (master == NULL) return NOTIFY_OK; /* not for us */ + if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) { + put_device(&master->dev); + return NOTIFY_OK; + } + spi = of_register_spi_device(master, rd->dn); put_device(&master->dev); @@ -2642,6 +2668,10 @@ static int of_spi_notify(struct notifier_block *nb, unsigned long action, break; case OF_RECONFIG_CHANGE_REMOVE: + /* already depopulated? */ + if (!of_node_check_flag(rd->dn, OF_POPULATED)) + return NOTIFY_OK; + /* find our device by node */ spi = of_find_spi_device_by_node(rd->dn); if (spi == NULL) |