From bd6c1644a2f6f46cdf89388e81168a70711fce3a Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Mon, 30 Nov 2015 15:28:07 +0100 Subject: spi: Mark instantiated device nodes with OF_POPULATE Mark (and unmark) device nodes with the POPULATE flag as appropriate. This is required to avoid multi probing when enabling and populating SPI buses in DT overlays. Based on commit 4f001fd30145a6a8 ("i2c: Mark instantiated device nodes with OF_POPULATE"). Suggested-by: Mark Brown Signed-off-by: Geert Uytterhoeven Signed-off-by: Mark Brown --- drivers/spi/spi.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 3f135cc9a70e..c7486a373af1 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -613,8 +613,12 @@ EXPORT_SYMBOL_GPL(spi_new_device); */ void spi_unregister_device(struct spi_device *spi) { - if (spi) - device_unregister(&spi->dev); + 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); @@ -1561,6 +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", @@ -2645,6 +2651,11 @@ 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); @@ -2656,6 +2667,10 @@ 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) -- cgit v1.2.1