[PATCH v1] rtc: snvs: add poweroff function

Robin Gong
2014-09-25T03:18:28Z

On i.mx6 chips, PMIC_ON_REQ can be pulled by snvs LPCR. That can be
used poweroff system if PMIC_ON_REQ connected with external PMIC or
power control circuit.Power up again if PMIC_ON_REQ pulled high.

Signed-off-by: Robin Gong <b38343@freescale.com>
---
Documentation/devicetree/bindings/crypto/fsl-sec4.txt | 4 ++++
drivers/rtc/rtc-snvs.c | 18 ++++++++++++++++++
2 files changed, 22 insertions(+)

diff --git a/Documentation/devicetree/bindings/crypto/fsl-sec4.txt b/Documentation/devicetree/bindings/crypto/fsl-sec4.txt
index e402277..00d67f2 100644
--- a/Documentation/devicetree/bindings/crypto/fsl-sec4.txt
+++ b/Documentation/devicetree/bindings/crypto/fsl-sec4.txt
@@ -363,11 +363,15 @@ Secure Non-Volatile Storage (SNVS) Low Power (LP) RTC Node
Value type: <prop-encoded-array>
Definition: A standard property. Specifies the physical
address and length of the SNVS LP configuration registers.
+ - fsl,poweroff
+ Usage: opertional, recommend if PMIC_ON_REQ connected with external
+ PMIC or power control circuit.

EXAMPLE
sec_mon_rtc_lp@314000 {
compatible = "fsl,sec-v4.0-mon-rtc-lp";
reg = <0x34 0x58>;
+ fsl,poweroff;
};

=====================================================================
diff --git a/drivers/rtc/rtc-snvs.c b/drivers/rtc/rtc-snvs.c
index fa384fe..ef32541 100644
--- a/drivers/rtc/rtc-snvs.c
+++ b/drivers/rtc/rtc-snvs.c
@@ -29,6 +29,8 @@
#define SNVS_LPCR_SRTC_ENV (1 << 0)
#define SNVS_LPCR_LPTA_EN (1 << 1)
#define SNVS_LPCR_LPWUI_EN (1 << 3)
+#define SNVS_LPCR_DP (1 << 5)
+#define SNVS_LPCR_TOP (1 << 6)
#define SNVS_LPSR_LPTA (1 << 0)

#define SNVS_LPPGDR_INIT 0x41736166
@@ -41,6 +43,8 @@ struct snvs_rtc_data {
spinlock_t lock;
};

+static void __iomem *snvs_base;
+
static u32 rtc_read_lp_counter(void __iomem *ioaddr)
{
u64 read1, read2;
@@ -241,8 +245,17 @@ static irqreturn_t snvs_rtc_irq_handler(int irq, void *dev_id)
return events ? IRQ_HANDLED : IRQ_NONE;
}

+static void snvs_poweroff(void)
+{
+ u32 value;
+
+ value = readl(snvs_base + SNVS_LPCR);
+ writel(value | SNVS_LPCR_DP | SNVS_LPCR_TOP, snvs_base + SNVS_LPCR);
+}
+
static int snvs_rtc_probe(struct platform_device *pdev)
{
+ struct device_node *np = pdev->dev.of_node;
struct snvs_rtc_data *data;
struct resource *res;
int ret;
@@ -260,6 +273,11 @@ static int snvs_rtc_probe(struct platform_device *pdev)
if (data->irq < 0)
return data->irq;

+ if (np && of_get_property(np, "fsl,poweroff", NULL)) {
+ snvs_base = data->ioaddr;
+ pm_power_off = snvs_poweroff;
+ }
+
platform_set_drvdata(pdev, data);

spin_lock_init(&data->lock);
--
1.9.1