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Subject[PATCH RFC v2 5/8] pinctrl: zynq: Support low power mode property
Date
 - for HSTL type pins, allow setting the low power mode property

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
---
drivers/pinctrl/pinctrl-zynq.c | 33 ++++++++++++++++++++++++++++-----
1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-zynq.c b/drivers/pinctrl/pinctrl-zynq.c
index f3fce76c8390..0136bddbb4be 100644
--- a/drivers/pinctrl/pinctrl-zynq.c
+++ b/drivers/pinctrl/pinctrl-zynq.c
@@ -879,9 +879,10 @@ static const struct pinmux_ops zynq_pinmux_ops = {
};

/* pinconfig */
-#define ZYNQ_PINCONF_TRISTATE BIT(0)
-#define ZYNQ_PINCONF_SPEED BIT(8)
-#define ZYNQ_PINCONF_PULLUP BIT(12)
+#define ZYNQ_PINCONF_TRISTATE BIT(0)
+#define ZYNQ_PINCONF_SPEED BIT(8)
+#define ZYNQ_PINCONF_PULLUP BIT(12)
+#define ZYNQ_PINCONF_DISABLE_RECVR BIT(13)

#define ZYNQ_PINCONF_IOTYPE_SHIFT 9
#define ZYNQ_PINCONF_IOTYPE_MASK (7 << ZYNQ_PINCONF_IOTYPE_SHIFT)
@@ -895,6 +896,11 @@ enum zynq_io_standards {
zynq_iostd_max
};

+static unsigned int zynq_pinconf_iostd_get(u32 reg)
+{
+ return (reg & ZYNQ_PINCONF_IOTYPE_MASK) >> ZYNQ_PINCONF_IOTYPE_SHIFT;
+}
+
static int zynq_pinconf_cfg_get(struct pinctrl_dev *pctldev,
unsigned pin,
unsigned long *config)
@@ -930,9 +936,19 @@ static int zynq_pinconf_cfg_get(struct pinctrl_dev *pctldev,
case PIN_CONFIG_SLEW_RATE:
arg = !!(reg & ZYNQ_PINCONF_SPEED);
break;
+ case PIN_CONFIG_LOW_POWER_MODE:
+ {
+ enum zynq_io_standards iostd = zynq_pinconf_iostd_get(reg);
+
+ if (iostd != zynq_iostd_hstl)
+ return -EINVAL;
+ if (!(reg & ZYNQ_PINCONF_DISABLE_RECVR))
+ return -EINVAL;
+ arg = !!(reg & ZYNQ_PINCONF_DISABLE_RECVR);
+ break;
+ }
case PIN_CONFIG_IOSTANDARD:
- arg = reg & ZYNQ_PINCONF_IOTYPE_MASK;
- arg >>= ZYNQ_PINCONF_IOTYPE_SHIFT;
+ arg = zynq_pinconf_iostd_get(reg);
break;
default:
return -ENOTSUPP;
@@ -994,6 +1010,13 @@ static int zynq_pinconf_cfg_set(struct pinctrl_dev *pctldev,
}
reg |= arg << ZYNQ_PINCONF_IOTYPE_SHIFT;
break;
+ case PIN_CONFIG_LOW_POWER_MODE:
+ if (arg)
+ reg |= ZYNQ_PINCONF_DISABLE_RECVR;
+ else
+ reg &= ~ZYNQ_PINCONF_DISABLE_RECVR;
+
+ break;
default:
dev_warn(pctldev->dev,
"unsupported configuration parameter '%u'\n",
--
2.1.2.1.g5e69ed6


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