[PATCH 2/2] Input: snvs_pwrkey - add configurable force shutdown time

[Ian Ray]

Support configurable shutdown period using a new, optional, device tree
property.

The force shutdown time is configured in LPCR[17:16] BTN_PRESS_TIME:

 * b00:  5 seconds (SoC default)
 * b01: 10 seconds
 * b10: 15 seconds
 * b11: PMIC is not disabled

Signed-off-by: Ian Ray <ian.ray@xxxxxxxxxxxxxxxx>
---
 .../arm64/boot/dts/freescale/imx8mp-ppdv2.dts |  4 ++++
 drivers/input/keyboard/snvs_pwrkey.c          | 24 +++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-ppdv2.dts b/arch/arm64/boot/dts/freescale/imx8mp-ppdv2.dts
index 7cc427f23e59..921eda35154a 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-ppdv2.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mp-ppdv2.dts
@@ -699,6 +699,10 @@ &pinctrl_usdhc2_200mhz {
 		<MX8MP_IOMUXC_GPIO1_IO04__GPIO1_IO04		0x106>;
 };
 
+&snvs_pwrkey {
+	force-shutdown-time = <0>;
+};
+
 &usdhc2 {
 	/delete-property/ cd-gpios;
 	/delete-property/ wp-gpios;
diff --git a/drivers/input/keyboard/snvs_pwrkey.c b/drivers/input/keyboard/snvs_pwrkey.c
index f7b5f1e25c80..2ba848df061c 100644
--- a/drivers/input/keyboard/snvs_pwrkey.c
+++ b/drivers/input/keyboard/snvs_pwrkey.c
@@ -27,7 +27,10 @@
 #define SNVS_HPSR_BTN		BIT(6)
 #define SNVS_LPSR_SPO		BIT(18)
 #define SNVS_LPCR_DEP_EN	BIT(5)
+#define SNVS_LPCR_BPT_SHIFT	16
+#define SNVS_LPCR_BPT_MASK	(3 << SNVS_LPCR_BPT_SHIFT)
 
+#define FORCE_SHUTDOWN_TIME	5	/* LPCR 17:16 default */
 #define DEBOUNCE_TIME		30
 #define REPEAT_INTERVAL		60
 
@@ -114,6 +117,8 @@ static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
 	struct device_node *np;
 	struct clk *clk;
 	int error;
+	int force_shutdown_time;
+	int bpt;
 	u32 vid;
 
 	/* Get SNVS register Page */
@@ -148,11 +153,30 @@ static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
 	if (pdata->irq < 0)
 		return -EINVAL;
 
+	force_shutdown_time = FORCE_SHUTDOWN_TIME;
+	of_property_read_u32(np, "force-shutdown-time", &force_shutdown_time);
+	switch (force_shutdown_time) {
+		case 0:
+			/* Disable long-press detection. */
+			bpt = 0x3;
+			break;
+		case 5:
+		case 10:
+		case 15:
+			bpt = (force_shutdown_time / 5) - 1;
+			break;
+		default:
+			dev_err(&pdev->dev, "Invalid force-shutdown-time %d\n", force_shutdown_time);
+			return -EINVAL;
+	}
+
 	regmap_read(pdata->snvs, SNVS_HPVIDR1_REG, &vid);
 	pdata->minor_rev = vid & 0xff;
 
 	regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN);
 
+	regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_BPT_MASK, bpt << SNVS_LPCR_BPT_SHIFT);
+
 	/* clear the unexpected interrupt before driver ready */
 	regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
 
-- 
2.39.5