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authorGeert Uytterhoeven2015-03-09 20:50:40 +0100
committerSimon Horman2015-03-11 09:52:12 +0900
commit663fbb52159cca6ffb049cb15b9f9d1cd7ad7d8a (patch)
treec354ff173f5616bd24faf68b441d1cc21d5c271f /arch/arm/mach-shmobile/Kconfig
parentc517d838eb7d07bbe9507871fab3931deccff539 (diff)
ARM: shmobile: R-Car Gen2: Add da9063/da9210 regulator quirk
The r8a7790/lager and r8a7791/koelsch development boards have da9063 and da9210 regulators. Both regulators have their interrupt request lines tied to the same interrupt pin (IRQ2) on the SoC. After cold boot or da9063-induced restart, both the da9063 and da9210 seem to assert their interrupt request lines. Hence as soon as one driver requests this irq, it gets stuck in an interrupt storm, as it only manages to deassert its own interrupt request line, and the other driver hasn't installed an interrupt handler yet. To handle this, install a quirk that masks the interrupts in both the da9063 and da9210. This quirk has to run after the i2c master driver has been initialized, but before the i2c slave drivers are initialized. As it depends on i2c, select I2C if one of the affected platforms is enabled in the kernel config. On koelsch, the following happens: - Cold boot or reboot using the da9063 restart handler: IRQ2 is asserted, installing da9063/da9210 regulator quirk ... i2c i2c-6: regulator_quirk_notify: 1, IRQC_MONITOR = 0x3fb i2c 6-0058: regulator_quirk_notify: 1, IRQC_MONITOR = 0x3fb i2c 6-0058: Detected da9063 i2c 6-0058: Masking da9063 interrupt sources i2c 6-0068: regulator_quirk_notify: 1, IRQC_MONITOR = 0x3fb i2c 6-0068: Detected da9210 i2c 6-0068: Masking da9210 interrupt sources i2c 6-0068: IRQ2 is not asserted, removing quirk - Warm boot (reset button): rcar_gen2_regulator_quirk: IRQ2 is not asserted, not installing quirk Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Mark Brown <broonie@kernel.org> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'arch/arm/mach-shmobile/Kconfig')
-rw-r--r--arch/arm/mach-shmobile/Kconfig2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig
index 2f36c85eec4b..347b6a58fc3e 100644
--- a/arch/arm/mach-shmobile/Kconfig
+++ b/arch/arm/mach-shmobile/Kconfig
@@ -69,10 +69,12 @@ config ARCH_R8A7779
config ARCH_R8A7790
bool "R-Car H2 (R8A77900)"
select ARCH_RCAR_GEN2
+ select I2C
config ARCH_R8A7791
bool "R-Car M2-W (R8A77910)"
select ARCH_RCAR_GEN2
+ select I2C
config ARCH_R8A7794
bool "R-Car E2 (R8A77940)"