[PATCH v4 2/3] ARM: mvebu: Add quirk for i2c
From: Gregory CLEMENT <hidden>
Date: 2014-01-07 16:35:03
Also in:
linux-i2c
Subsystem:
arm port, arm/marvell kirkwood and armada 370, 375, 38x, 39x, xp, 3700, 7k/8k, cn9130 soc support, the rest · Maintainers:
Russell King, Andrew Lunn, Gregory Clement, Sebastian Hesselbarth, Linus Torvalds
The first variants of Armada XP SoCs (A0 stepping) have issues related to the i2c controller which prevent to use the offload mechanism and lead to a kernel hang during boot. This commit add quirk in the mvebu platform code to check the SoC version and then add the "offload-broken" property for the i2c controller according to the revision of the SoC. Signed-off-by: Gregory CLEMENT <redacted> --- arch/arm/mach-mvebu/armada-370-xp.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)
diff --git a/arch/arm/mach-mvebu/armada-370-xp.c b/arch/arm/mach-mvebu/armada-370-xp.c
index e2acff98e750..c93ac68779e0 100644
--- a/arch/arm/mach-mvebu/armada-370-xp.c
+++ b/arch/arm/mach-mvebu/armada-370-xp.c@@ -21,6 +21,7 @@ #include <linux/clocksource.h> #include <linux/dma-mapping.h> #include <linux/mbus.h> +#include <linux/mvebu-soc-id.h> #include <asm/hardware/cache-l2x0.h> #include <asm/mach/arch.h> #include <asm/mach/map.h>
@@ -45,8 +46,31 @@ static void __init armada_370_xp_timer_and_clk_init(void) #endif } +static struct property i2c_offload_broken = { + .name = "offload-broken", +}; + +static void __init i2c_quirk(void) +{ + struct device_node *np; + u32 dev, rev; + + /* + * Only revisons more recent than A0 support the offload + * mechanism. We can exit only if we are sure that we can + * get the SoC revision and it is more recent than A0. + */ + if (mvebu_get_soc_id(&rev, &dev) == 0 && dev > MV78XX0_A0_REV) + return; + + for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") + of_add_property(np, &i2c_offload_broken); + return; +} + static void __init armada_370_xp_dt_init(void) { + i2c_quirk(); of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); }
--
1.8.1.2