From 0456d3300edba52e47c6b5582cfe9d87756f5590 Mon Sep 17 00:00:00 2001 From: Thomas Petazzoni Date: Tue, 22 Apr 2014 23:26:13 +0200 Subject: memory: mvebu-devbus: add a devbus, keep-config property Currently, the mvebu-devbus Device Tree binding makes defining the timing parameters mandatory. However, in practice, when converting Orion5x platforms to the Device Tree, we may not necessarily have easy access to the hardware platforms to fetch those values which were not defined in old-style board files: all these platforms rely on the bootloader setting the timing parameters correctly. In order to facilitate the migration to the Device Tree of this platform, this commit relaxes the mvebu-devbus Device Tree binding by introducing a 'devbus,keep-config' boolean property, which, if defined, will ignore all timing parameters passed in the Device Tree, and simply rely on the timing values already defined by the bootloader. Signed-off-by: Thomas Petazzoni Acked-by: Sebastian Hesselbarth Tested-by: Ezequiel Garcia Link: https://lkml.kernel.org/r/1398202002-28530-10-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Jason Cooper --- drivers/memory/mvebu-devbus.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) (limited to 'drivers/memory/mvebu-devbus.c') diff --git a/drivers/memory/mvebu-devbus.c b/drivers/memory/mvebu-devbus.c index c8f3dad8a825..ff7138fd66d1 100644 --- a/drivers/memory/mvebu-devbus.c +++ b/drivers/memory/mvebu-devbus.c @@ -310,16 +310,18 @@ static int mvebu_devbus_probe(struct platform_device *pdev) dev_dbg(devbus->dev, "Setting timing parameter, tick is %lu ps\n", devbus->tick_ps); - /* Read the Device Tree node */ - err = devbus_get_timing_params(devbus, node, &r, &w); - if (err < 0) - return err; + if (!of_property_read_bool(node, "devbus,keep-config")) { + /* Read the Device Tree node */ + err = devbus_get_timing_params(devbus, node, &r, &w); + if (err < 0) + return err; - /* Set the new timing parameters */ - if (of_device_is_compatible(node, "marvell,orion-devbus")) - devbus_orion_set_timing_params(devbus, node, &r, &w); - else - devbus_armada_set_timing_params(devbus, node, &r, &w); + /* Set the new timing parameters */ + if (of_device_is_compatible(node, "marvell,orion-devbus")) + devbus_orion_set_timing_params(devbus, node, &r, &w); + else + devbus_armada_set_timing_params(devbus, node, &r, &w); + } /* * We need to create a child device explicitly from here to -- cgit