pinctrl: qcom: spmi-gpio: Add dtest route for digital input
Add property "qcom,dtest-buffer" to specify which dtest rail to feed
when the pin is configured as a digital input.
Change-Id: I05b253147677ca66d926eaeaa680bd09e31247a5
Signed-off-by: Fenglin Wu <fenglinw@codeaurora.org>
diff --git a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
index b268139..284655e 100644
--- a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
+++ b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
@@ -51,6 +51,7 @@
#define PMIC_GPIO_REG_DIG_VIN_CTL 0x41
#define PMIC_GPIO_REG_DIG_PULL_CTL 0x42
#define PMIC_GPIO_REG_LV_MV_DIG_OUT_SOURCE_CTL 0x44
+#define PMIC_GPIO_REG_DIG_IN_CTL 0x43
#define PMIC_GPIO_REG_DIG_OUT_CTL 0x45
#define PMIC_GPIO_REG_EN_CTL 0x46
#define PMIC_GPIO_REG_LV_MV_ANA_PASS_THRU_SEL 0x4A
@@ -85,6 +86,11 @@
#define PMIC_GPIO_LV_MV_OUTPUT_INVERT_SHIFT 7
#define PMIC_GPIO_LV_MV_OUTPUT_SOURCE_SEL_MASK 0xF
+/* PMIC_GPIO_REG_DIG_IN_CTL */
+#define PMIC_GPIO_LV_MV_DIG_IN_DTEST_EN 0x80
+#define PMIC_GPIO_LV_MV_DIG_IN_DTEST_SEL_MASK 0x7
+#define PMIC_GPIO_DIG_IN_DTEST_SEL_MASK 0xf
+
/* PMIC_GPIO_REG_DIG_OUT_CTL */
#define PMIC_GPIO_REG_OUT_STRENGTH_SHIFT 0
#define PMIC_GPIO_REG_OUT_STRENGTH_MASK 0x3
@@ -111,6 +117,7 @@
#define PMIC_GPIO_CONF_PULL_UP (PIN_CONFIG_END + 1)
#define PMIC_GPIO_CONF_STRENGTH (PIN_CONFIG_END + 2)
#define PMIC_GPIO_CONF_ATEST (PIN_CONFIG_END + 3)
+#define PMIC_GPIO_CONF_DTEST_BUFFER (PIN_CONFIG_END + 4)
/* The index of each function in pmic_gpio_functions[] array */
enum pmic_gpio_func_index {
@@ -145,6 +152,8 @@
* @strength: No, Low, Medium, High
* @function: See pmic_gpio_functions[]
* @atest: the ATEST selection for GPIO analog-pass-through mode
+ * @dtest_buffer: the DTEST buffer selection for digital input mode,
+ * the default value is INT_MAX if not used.
*/
struct pmic_gpio_pad {
u16 base;
@@ -162,6 +171,7 @@
unsigned int strength;
unsigned int function;
unsigned int atest;
+ unsigned int dtest_buffer;
};
struct pmic_gpio_state {
@@ -175,6 +185,7 @@
{"qcom,pull-up-strength", PMIC_GPIO_CONF_PULL_UP, 0},
{"qcom,drive-strength", PMIC_GPIO_CONF_STRENGTH, 0},
{"qcom,atest", PMIC_GPIO_CONF_ATEST, 0},
+ {"qcom,dtest-buffer", PMIC_GPIO_CONF_DTEST_BUFFER, 0},
};
#ifdef CONFIG_DEBUG_FS
@@ -433,6 +444,9 @@
case PMIC_GPIO_CONF_ATEST:
arg = pad->atest;
break;
+ case PMIC_GPIO_CONF_DTEST_BUFFER:
+ arg = pad->dtest_buffer;
+ break;
default:
return -EINVAL;
}
@@ -512,6 +526,13 @@
return -EINVAL;
pad->atest = arg;
break;
+ case PMIC_GPIO_CONF_DTEST_BUFFER:
+ if ((pad->lv_mv_type && arg > PMIC_GPIO_DIN_DTEST4)
+ || (!pad->lv_mv_type && arg >
+ PMIC_GPIO_DIG_IN_DTEST_SEL_MASK))
+ return -EINVAL;
+ pad->dtest_buffer = arg;
+ break;
default:
return -EINVAL;
}
@@ -544,6 +565,17 @@
val = PMIC_GPIO_MODE_DIGITAL_OUTPUT;
}
+ if (pad->dtest_buffer != INT_MAX) {
+ val = pad->dtest_buffer;
+ if (pad->lv_mv_type)
+ val |= PMIC_GPIO_LV_MV_DIG_IN_DTEST_EN;
+
+ ret = pmic_gpio_write(state, pad,
+ PMIC_GPIO_REG_DIG_IN_CTL, val);
+ if (ret < 0)
+ return ret;
+ }
+
if (pad->lv_mv_type) {
if (pad->function == PMIC_GPIO_FUNC_INDEX_ANALOG) {
val = PMIC_GPIO_MODE_ANALOG_PASS_THRU;
@@ -641,6 +673,8 @@
seq_printf(s, " %-10s", buffer_types[pad->buffer_type]);
seq_printf(s, " %-4s", pad->out_value ? "high" : "low");
seq_printf(s, " %-7s", strengths[pad->strength]);
+ if (pad->dtest_buffer != INT_MAX)
+ seq_printf(s, " dtest buffer %d", pad->dtest_buffer);
}
}
@@ -860,6 +894,17 @@
pad->pullup = val >> PMIC_GPIO_REG_PULL_SHIFT;
pad->pullup &= PMIC_GPIO_REG_PULL_MASK;
+ val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_DIG_IN_CTL);
+ if (val < 0)
+ return val;
+
+ if (pad->lv_mv_type && (val & PMIC_GPIO_LV_MV_DIG_IN_DTEST_EN))
+ pad->dtest_buffer = val & PMIC_GPIO_LV_MV_DIG_IN_DTEST_SEL_MASK;
+ else if (!pad->lv_mv_type)
+ pad->dtest_buffer = val & PMIC_GPIO_DIG_IN_DTEST_SEL_MASK;
+ else
+ pad->dtest_buffer = INT_MAX;
+
val = pmic_gpio_read(state, pad, PMIC_GPIO_REG_DIG_OUT_CTL);
if (val < 0)
return val;