ARM: dts: imx53-qsrb: Pulldown PMIC IRQ pin
authorFabio Estevam <fabio.estevam@nxp.com>
Wed, 12 Apr 2017 21:31:18 +0000 (18:31 -0300)
committerShawn Guo <shawnguo@kernel.org>
Mon, 15 May 2017 01:33:22 +0000 (09:33 +0800)
Currently the following errors are seen:

[   14.015056] mc13xxx 0-0008: Failed to read IRQ status: -6
[   27.321093] mc13xxx 0-0008: Failed to read IRQ status: -6
[   27.411681] mc13xxx 0-0008: Failed to read IRQ status: -6
[   27.456281] mc13xxx 0-0008: Failed to read IRQ status: -6
[   30.527106] mc13xxx 0-0008: Failed to read IRQ status: -6
[   36.596900] mc13xxx 0-0008: Failed to read IRQ status: -6

Also when reading the interrupts via 'cat /proc/interrupts' the
PMIC GPIO interrupt counter does not stop increasing.

The reason for the storm of interrupts is that the PUS field of
register IOMUXC_SW_PAD_CTL_PAD_CSI0_DAT5 is currently configured as:
10 : 100k pullup

and the PMIC interrupt is being registered as IRQ_TYPE_LEVEL_HIGH type,
which is the correct type as per the MC34708 datasheet.

Use the default power on value for the IOMUX, which sets PUS field as:
00: 360k pull down

This prevents the spurious PMIC interrupts from happening.

Commit e1ffceb078c6 ("ARM: imx53: qsrb: fix PMIC interrupt level")
correctly described the irq type as IRQ_TYPE_LEVEL_HIGH, but
missed to update the IOMUX of the PMIC GPIO as pull down.

Fixes: e1ffceb078c6 ("ARM: imx53: qsrb: fix PMIC interrupt level")
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
arch/arm/boot/dts/imx53-qsrb.dts

index de22158..4e103a9 100644 (file)
@@ -23,7 +23,7 @@
        imx53-qsrb {
                pinctrl_pmic: pmicgrp {
                        fsl,pins = <
-                               MX53_PAD_CSI0_DAT5__GPIO5_23    0x1e4 /* IRQ */
+                               MX53_PAD_CSI0_DAT5__GPIO5_23    0x1c4 /* IRQ */
                        >;
                };
        };