[PATCH] ARM: imx: gpc: Initialize all power domains

[Fabio Estevam]

When booting a kernel built with multi_v7_defconfig the following
probe error is seen:

imx-gpc: probe of 20dc000.gpc failed with error -22

Later on the kernel crashes like this:

[    1.723358] Unable to handle kernel NULL pointer dereference at virtual address 00000040
[    1.731500] pgd = c0204000
[    1.731863] hctosys: unable to open rtc device (rtc0)
[    1.739301] [00000040] *pgd=00000000
[    1.739310] Internal error: Oops: 5 [#1] SMP ARM
[    1.739319] Modules linked in:
[    1.739328] CPU: 1 PID: 95 Comm: kworker/1:4 Not tainted 4.8.0-11897-g6b5e09a #1
[    1.739331] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
[    1.739352] Workqueue: pm genpd_power_off_work_fn
[    1.739356] task: ee63d400 task.stack: ee70a000
[    1.739365] PC is at mutex_lock+0xc/0x4c
[    1.739374] LR is at regulator_disable+0x2c/0x60
[    1.739379] pc : [<c0bc0da0>]    lr : [<c06e4b10>]    psr: 60000013
[    1.739379] sp : ee70beb0  ip : 10624dd3  fp : ee6e6280
[    1.739382] r10: eefb0900  r9 : 00000000  r8 : c1309918
[    1.739385] r7 : 00000000  r6 : 00000040  r5 : 00000000  r4 : 00000040
[    1.739390] r3 : 0000004c  r2 : 7fffd540  r1 : 000001e4  r0 : 00000040

The gpc probe fails because of_genpd_add_provider_onecell() checks
if all the domains are initialized via pm_genpd_present() function
and it returns an error on the multi_v7_defconfig case.

In order to fix this error, initialize all the imx_gpc_domains, not
only the imx6q_pu_domain.base one.

Reported-by: Olof's autobooter <build at lixom.net>
Signed-off-by: Fabio Estevam <fabio.estevam at nxp.com>
---
 arch/arm/mach-imx/gpc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-imx/gpc.c b/arch/arm/mach-imx/gpc.c
index 0df062d..d0463e9 100644
--- a/arch/arm/mach-imx/gpc.c
+++ b/arch/arm/mach-imx/gpc.c
@@ -430,7 +430,8 @@ static int imx_gpc_genpd_init(struct device *dev, struct regulator *pu_reg)
 	if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
 		return 0;
 
-	pm_genpd_init(&imx6q_pu_domain.base, NULL, false);
+	for (i = 0; i < ARRAY_SIZE(imx_gpc_domains); i++)
+		pm_genpd_init(imx_gpc_domains[i], NULL, false);
 	return of_genpd_add_provider_onecell(dev->of_node,
 					     &imx_gpc_onecell_data);
 
-- 
2.7.4