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path: root/drivers/mfd/sm501.c
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Diffstat (limited to 'drivers/mfd/sm501.c')
-rw-r--r--drivers/mfd/sm501.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
index e14d70e07418..8135e4c3bf47 100644
--- a/drivers/mfd/sm501.c
+++ b/drivers/mfd/sm501.c
@@ -893,6 +893,7 @@ static int sm501_init_dev(struct sm501_devdata *sm)
{
resource_size_t mem_avail;
unsigned long dramctrl;
+ unsigned long devid;
int ret;
mutex_init(&sm->clock_lock);
@@ -900,13 +901,18 @@ static int sm501_init_dev(struct sm501_devdata *sm)
INIT_LIST_HEAD(&sm->devices);
- dramctrl = readl(sm->regs + SM501_DRAM_CONTROL);
+ devid = readl(sm->regs + SM501_DEVICEID);
+ if ((devid & SM501_DEVICEID_IDMASK) != SM501_DEVICEID_SM501) {
+ dev_err(sm->dev, "incorrect device id %08lx\n", devid);
+ return -EINVAL;
+ }
+
+ dramctrl = readl(sm->regs + SM501_DRAM_CONTROL);
mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7];
- dev_info(sm->dev, "SM501 At %p: Version %08x, %ld Mb, IRQ %d\n",
- sm->regs, readl(sm->regs + SM501_DEVICEID),
- (unsigned long)mem_avail >> 20, sm->irq);
+ dev_info(sm->dev, "SM501 At %p: Version %08lx, %ld Mb, IRQ %d\n",
+ sm->regs, devid, (unsigned long)mem_avail >> 20, sm->irq);
sm501_dump_gate(sm);