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* [PATCH v4 0/6] Add drive-strength in Meson pinctrl driver
@ 2019-05-09 16:29 Guillaume La Roque
  2019-05-09 16:29 ` [PATCH v4 1/6] dt-bindings: pinctrl: add a 'drive-strength-microamp' property Guillaume La Roque
                   ` (6 more replies)
  0 siblings, 7 replies; 9+ messages in thread
From: Guillaume La Roque @ 2019-05-09 16:29 UTC (permalink / raw)
  To: linus.walleij, khilman
  Cc: linux-gpio, devicetree, linux-amlogic, linux-kernel, jbrunet

The purpose of this patchset is to add drive-strength support in meson pinconf
driver. This is a new feature that was added on the g12a. It is critical for us
to support this since many functions are failing with default pad drive-strength.

The value achievable by the SoC are 0.5mA, 2.5mA, 3mA and 4mA and the DT property
'drive-strength' is expressed in mA.
So this patch add another generic property "drive-strength-uA". The change to do so
would be minimal and could be benefit to other platforms later on.

Cheers
Guillaume

Changes since v3:
- remove dev_err in meson_get_drive_strength
- cleanup code

Changes since v2:
- update driver-strength-uA property to be compliant with DT documentation
- rework patch series for better understanding
- rework set_bias function

Changes since v1:
- fix missing break
- implement new pinctrl generic property "drive-strength-uA"

[1] https://lkml.kernel.org/r/20190314163725.7918-1-jbrunet@baylibre.com

Guillaume La Roque (6):
  dt-bindings: pinctrl: add a 'drive-strength-microamp' property
  pinctrl: generic: add new 'drive-strength-microamp' property support
  dt-bindings: pinctrl: meson: Add drive-strength-microamp property
  pinctrl: meson: Rework enable/disable bias part
  pinctrl: meson: add support of drive-strength-microamp
  pinctrl: meson: g12a: add DS bank value

 .../bindings/pinctrl/meson,pinctrl.txt        |   4 +
 .../bindings/pinctrl/pinctrl-bindings.txt     |   3 +
 drivers/pinctrl/meson/pinctrl-meson-g12a.c    |  36 ++--
 drivers/pinctrl/meson/pinctrl-meson.c         | 180 ++++++++++++++----
 drivers/pinctrl/meson/pinctrl-meson.h         |  18 +-
 drivers/pinctrl/pinconf-generic.c             |   2 +
 include/linux/pinctrl/pinconf-generic.h       |   3 +
 7 files changed, 193 insertions(+), 53 deletions(-)

-- 
2.17.1


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^ permalink raw reply	[flat|nested] 9+ messages in thread

* [PATCH v4 1/6] dt-bindings: pinctrl: add a 'drive-strength-microamp' property
  2019-05-09 16:29 [PATCH v4 0/6] Add drive-strength in Meson pinctrl driver Guillaume La Roque
@ 2019-05-09 16:29 ` Guillaume La Roque
  2019-05-09 17:35   ` Kevin Hilman
  2019-05-09 16:29 ` [PATCH v4 2/6] pinctrl: generic: add new 'drive-strength-microamp' property support Guillaume La Roque
                   ` (5 subsequent siblings)
  6 siblings, 1 reply; 9+ messages in thread
From: Guillaume La Roque @ 2019-05-09 16:29 UTC (permalink / raw)
  To: linus.walleij, khilman
  Cc: linux-gpio, devicetree, linux-amlogic, linux-kernel, jbrunet

This property allow drive-strength parameter in uA instead of mA.

Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
---
 Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
index cef2b5855d60..84adce9f2a75 100644
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
@@ -258,6 +258,7 @@ drive-push-pull		- drive actively high and low
 drive-open-drain	- drive with open drain
 drive-open-source	- drive with open source
 drive-strength		- sink or source at most X mA
+drive-strength-microamp	- sink or source at most X uA
 input-enable		- enable input on pin (no effect on output, such as
 			  enabling an input buffer)
 input-disable		- disable input on pin (no effect on output, such as
@@ -326,6 +327,8 @@ arguments are described below.
 
 - drive-strength takes as argument the target strength in mA.
 
+- drive-strength-uA takes as argument the target strength in uA.
+
 - input-debounce takes the debounce time in usec as argument
   or 0 to disable debouncing
 
-- 
2.17.1


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^ permalink raw reply	[flat|nested] 9+ messages in thread

* [PATCH v4 2/6] pinctrl: generic: add new 'drive-strength-microamp' property support
  2019-05-09 16:29 [PATCH v4 0/6] Add drive-strength in Meson pinctrl driver Guillaume La Roque
  2019-05-09 16:29 ` [PATCH v4 1/6] dt-bindings: pinctrl: add a 'drive-strength-microamp' property Guillaume La Roque
@ 2019-05-09 16:29 ` Guillaume La Roque
  2019-05-09 16:29 ` [PATCH v4 3/6] dt-bindings: pinctrl: meson: Add drive-strength-microamp property Guillaume La Roque
                   ` (4 subsequent siblings)
  6 siblings, 0 replies; 9+ messages in thread
From: Guillaume La Roque @ 2019-05-09 16:29 UTC (permalink / raw)
  To: linus.walleij, khilman
  Cc: linux-gpio, devicetree, linux-amlogic, linux-kernel, jbrunet

Add drive-strength-microamp property support to allow drive strength in uA

Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
---
 drivers/pinctrl/pinconf-generic.c       | 2 ++
 include/linux/pinctrl/pinconf-generic.h | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/drivers/pinctrl/pinconf-generic.c b/drivers/pinctrl/pinconf-generic.c
index b4f7f8a458ea..d0cbdb1ad76a 100644
--- a/drivers/pinctrl/pinconf-generic.c
+++ b/drivers/pinctrl/pinconf-generic.c
@@ -39,6 +39,7 @@ static const struct pin_config_item conf_items[] = {
 	PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
 	PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
 	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
+	PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH_UA, "output drive strength", "uA", true),
 	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
 	PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
 	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
@@ -167,6 +168,7 @@ static const struct pinconf_generic_params dt_params[] = {
 	{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
 	{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
 	{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
+	{ "drive-strength-microamp", PIN_CONFIG_DRIVE_STRENGTH_UA, 0 },
 	{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
 	{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
 	{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
diff --git a/include/linux/pinctrl/pinconf-generic.h b/include/linux/pinctrl/pinconf-generic.h
index 6c0680641108..72d06d6a3099 100644
--- a/include/linux/pinctrl/pinconf-generic.h
+++ b/include/linux/pinctrl/pinconf-generic.h
@@ -55,6 +55,8 @@
  *	push-pull mode, the argument is ignored.
  * @PIN_CONFIG_DRIVE_STRENGTH: the pin will sink or source at most the current
  *	passed as argument. The argument is in mA.
+ * @PIN_CONFIG_DRIVE_STRENGTH_UA: the pin will sink or source at most the current
+ *	passed as argument. The argument is in uA.
  * @PIN_CONFIG_INPUT_DEBOUNCE: this will configure the pin to debounce mode,
  *	which means it will wait for signals to settle when reading inputs. The
  *	argument gives the debounce time in usecs. Setting the
@@ -112,6 +114,7 @@ enum pin_config_param {
 	PIN_CONFIG_DRIVE_OPEN_SOURCE,
 	PIN_CONFIG_DRIVE_PUSH_PULL,
 	PIN_CONFIG_DRIVE_STRENGTH,
+	PIN_CONFIG_DRIVE_STRENGTH_UA,
 	PIN_CONFIG_INPUT_DEBOUNCE,
 	PIN_CONFIG_INPUT_ENABLE,
 	PIN_CONFIG_INPUT_SCHMITT,
-- 
2.17.1


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^ permalink raw reply	[flat|nested] 9+ messages in thread

* [PATCH v4 3/6] dt-bindings: pinctrl: meson: Add drive-strength-microamp property
  2019-05-09 16:29 [PATCH v4 0/6] Add drive-strength in Meson pinctrl driver Guillaume La Roque
  2019-05-09 16:29 ` [PATCH v4 1/6] dt-bindings: pinctrl: add a 'drive-strength-microamp' property Guillaume La Roque
  2019-05-09 16:29 ` [PATCH v4 2/6] pinctrl: generic: add new 'drive-strength-microamp' property support Guillaume La Roque
@ 2019-05-09 16:29 ` Guillaume La Roque
  2019-05-09 16:29 ` [PATCH v4 4/6] pinctrl: meson: Rework enable/disable bias part Guillaume La Roque
                   ` (3 subsequent siblings)
  6 siblings, 0 replies; 9+ messages in thread
From: Guillaume La Roque @ 2019-05-09 16:29 UTC (permalink / raw)
  To: linus.walleij, khilman
  Cc: linux-gpio, devicetree, linux-amlogic, linux-kernel, jbrunet

Add optional drive-strength-microamp property

Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
---
 Documentation/devicetree/bindings/pinctrl/meson,pinctrl.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/pinctrl/meson,pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/meson,pinctrl.txt
index a47dd990a8d3..a7618605bf1e 100644
--- a/Documentation/devicetree/bindings/pinctrl/meson,pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/meson,pinctrl.txt
@@ -51,6 +51,10 @@ Configuration nodes support the generic properties "bias-disable",
 "bias-pull-up" and "bias-pull-down", described in file
 pinctrl-bindings.txt
 
+Optional properties :
+ - drive-strength-microamp: Drive strength for the specified pins in uA.
+			    This property is only valid for G12A and newer.
+
 === Example ===
 
 	pinctrl: pinctrl@c1109880 {
-- 
2.17.1


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^ permalink raw reply	[flat|nested] 9+ messages in thread

* [PATCH v4 4/6] pinctrl: meson: Rework enable/disable bias part
  2019-05-09 16:29 [PATCH v4 0/6] Add drive-strength in Meson pinctrl driver Guillaume La Roque
                   ` (2 preceding siblings ...)
  2019-05-09 16:29 ` [PATCH v4 3/6] dt-bindings: pinctrl: meson: Add drive-strength-microamp property Guillaume La Roque
@ 2019-05-09 16:29 ` Guillaume La Roque
  2019-05-09 16:29 ` [PATCH v4 5/6] pinctrl: meson: add support of drive-strength-microamp Guillaume La Roque
                   ` (2 subsequent siblings)
  6 siblings, 0 replies; 9+ messages in thread
From: Guillaume La Roque @ 2019-05-09 16:29 UTC (permalink / raw)
  To: linus.walleij, khilman
  Cc: linux-gpio, devicetree, linux-amlogic, linux-kernel, jbrunet

rework bias enable/disable part to prepare drive-strength integration
no functional changes

Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
---
 drivers/pinctrl/meson/pinctrl-meson.c | 85 +++++++++++++++------------
 1 file changed, 49 insertions(+), 36 deletions(-)

diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c
index 96a4a72708e4..8ea5c1527064 100644
--- a/drivers/pinctrl/meson/pinctrl-meson.c
+++ b/drivers/pinctrl/meson/pinctrl-meson.c
@@ -174,62 +174,75 @@ int meson_pmx_get_groups(struct pinctrl_dev *pcdev, unsigned selector,
 	return 0;
 }
 
-static int meson_pinconf_set(struct pinctrl_dev *pcdev, unsigned int pin,
-			     unsigned long *configs, unsigned num_configs)
+static int meson_pinconf_disable_bias(struct meson_pinctrl *pc,
+				      unsigned int pin)
 {
-	struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
 	struct meson_bank *bank;
-	enum pin_config_param param;
-	unsigned int reg, bit;
-	int i, ret;
+	unsigned int reg, bit = 0;
+	int ret;
 
 	ret = meson_get_bank(pc, pin, &bank);
 	if (ret)
 		return ret;
 
+	meson_calc_reg_and_bit(bank, pin, REG_PULLEN, &reg, &bit);
+	ret = regmap_update_bits(pc->reg_pullen, reg, BIT(bit), 0);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int meson_pinconf_enable_bias(struct meson_pinctrl *pc, unsigned int pin,
+				     bool pull_up)
+{
+	struct meson_bank *bank;
+	unsigned int reg, bit, val = 0;
+	int ret;
+
+	ret = meson_get_bank(pc, pin, &bank);
+	if (ret)
+		return ret;
+
+	meson_calc_reg_and_bit(bank, pin, REG_PULL, &reg, &bit);
+	if (pull_up)
+		val = BIT(bit);
+
+	ret = regmap_update_bits(pc->reg_pull, reg, BIT(bit), val);
+	if (ret)
+		return ret;
+
+	meson_calc_reg_and_bit(bank, pin, REG_PULLEN, &reg, &bit);
+	ret = regmap_update_bits(pc->reg_pullen, reg, BIT(bit),	BIT(bit));
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int meson_pinconf_set(struct pinctrl_dev *pcdev, unsigned int pin,
+			     unsigned long *configs, unsigned num_configs)
+{
+	struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
+	enum pin_config_param param;
+	int i, ret;
+
 	for (i = 0; i < num_configs; i++) {
 		param = pinconf_to_config_param(configs[i]);
 
 		switch (param) {
 		case PIN_CONFIG_BIAS_DISABLE:
-			dev_dbg(pc->dev, "pin %u: disable bias\n", pin);
-
-			meson_calc_reg_and_bit(bank, pin, REG_PULLEN, &reg,
-					       &bit);
-			ret = regmap_update_bits(pc->reg_pullen, reg,
-						 BIT(bit), 0);
+			ret = meson_pinconf_disable_bias(pc, pin);
 			if (ret)
 				return ret;
 			break;
 		case PIN_CONFIG_BIAS_PULL_UP:
-			dev_dbg(pc->dev, "pin %u: enable pull-up\n", pin);
-
-			meson_calc_reg_and_bit(bank, pin, REG_PULLEN,
-					       &reg, &bit);
-			ret = regmap_update_bits(pc->reg_pullen, reg,
-						 BIT(bit), BIT(bit));
-			if (ret)
-				return ret;
-
-			meson_calc_reg_and_bit(bank, pin, REG_PULL, &reg, &bit);
-			ret = regmap_update_bits(pc->reg_pull, reg,
-						 BIT(bit), BIT(bit));
+			ret = meson_pinconf_enable_bias(pc, pin, true);
 			if (ret)
 				return ret;
 			break;
 		case PIN_CONFIG_BIAS_PULL_DOWN:
-			dev_dbg(pc->dev, "pin %u: enable pull-down\n", pin);
-
-			meson_calc_reg_and_bit(bank, pin, REG_PULLEN,
-					       &reg, &bit);
-			ret = regmap_update_bits(pc->reg_pullen, reg,
-						 BIT(bit), BIT(bit));
-			if (ret)
-				return ret;
-
-			meson_calc_reg_and_bit(bank, pin, REG_PULL, &reg, &bit);
-			ret = regmap_update_bits(pc->reg_pull, reg,
-						 BIT(bit), 0);
+			ret = meson_pinconf_enable_bias(pc, pin, false);
 			if (ret)
 				return ret;
 			break;
-- 
2.17.1


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^ permalink raw reply	[flat|nested] 9+ messages in thread

* [PATCH v4 5/6] pinctrl: meson: add support of drive-strength-microamp
  2019-05-09 16:29 [PATCH v4 0/6] Add drive-strength in Meson pinctrl driver Guillaume La Roque
                   ` (3 preceding siblings ...)
  2019-05-09 16:29 ` [PATCH v4 4/6] pinctrl: meson: Rework enable/disable bias part Guillaume La Roque
@ 2019-05-09 16:29 ` Guillaume La Roque
  2019-05-09 16:29 ` [PATCH v4 6/6] pinctrl: meson: g12a: add DS bank value Guillaume La Roque
  2019-05-09 17:34 ` [PATCH v4 0/6] Add drive-strength in Meson pinctrl driver Kevin Hilman
  6 siblings, 0 replies; 9+ messages in thread
From: Guillaume La Roque @ 2019-05-09 16:29 UTC (permalink / raw)
  To: linus.walleij, khilman
  Cc: linux-gpio, devicetree, linux-amlogic, linux-kernel, jbrunet

drive-strength-microamp is a new feature needed for G12A SoC.
the default DS setting after boot is usually 500uA and it is not enough for
many functions. We need to be able to set the drive strength to reliably
enable things like MMC, I2C, etc ...

Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
---
 drivers/pinctrl/meson/pinctrl-meson.c | 99 +++++++++++++++++++++++++++
 drivers/pinctrl/meson/pinctrl-meson.h | 18 ++++-
 2 files changed, 116 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c
index 8ea5c1527064..33b4b141baac 100644
--- a/drivers/pinctrl/meson/pinctrl-meson.c
+++ b/drivers/pinctrl/meson/pinctrl-meson.c
@@ -220,11 +220,54 @@ static int meson_pinconf_enable_bias(struct meson_pinctrl *pc, unsigned int pin,
 	return 0;
 }
 
+static int meson_pinconf_set_drive_strength(struct meson_pinctrl *pc,
+					    unsigned int pin,
+					    u16 drive_strength_ua)
+{
+	struct meson_bank *bank;
+	unsigned int reg, bit, ds_val;
+	int ret;
+
+	if (!pc->reg_ds) {
+		dev_err(pc->dev, "drive-strength not supported\n");
+		return -ENOTSUPP;
+	}
+
+	ret = meson_get_bank(pc, pin, &bank);
+	if (ret)
+		return ret;
+
+	meson_calc_reg_and_bit(bank, pin, REG_DS, &reg, &bit);
+	bit = bit << 1;
+
+	if (drive_strength_ua <= 500) {
+		ds_val = MESON_PINCONF_DRV_500UA;
+	} else if (drive_strength_ua <= 2500) {
+		ds_val = MESON_PINCONF_DRV_2500UA;
+	} else if (drive_strength_ua <= 3000) {
+		ds_val = MESON_PINCONF_DRV_3000UA;
+	} else if (drive_strength_ua <= 4000) {
+		ds_val = MESON_PINCONF_DRV_4000UA;
+	} else {
+		dev_warn_once(pc->dev,
+			      "pin %u: invalid drive-strength : %d , default to 4mA\n",
+			      pin, drive_strength_ua);
+		ds_val = MESON_PINCONF_DRV_4000UA;
+	}
+
+	ret = regmap_update_bits(pc->reg_ds, reg, 0x3 << bit, ds_val << bit);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
 static int meson_pinconf_set(struct pinctrl_dev *pcdev, unsigned int pin,
 			     unsigned long *configs, unsigned num_configs)
 {
 	struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
 	enum pin_config_param param;
+	unsigned int drive_strength_ua;
 	int i, ret;
 
 	for (i = 0; i < num_configs; i++) {
@@ -246,6 +289,14 @@ static int meson_pinconf_set(struct pinctrl_dev *pcdev, unsigned int pin,
 			if (ret)
 				return ret;
 			break;
+		case PIN_CONFIG_DRIVE_STRENGTH_UA:
+			drive_strength_ua =
+				pinconf_to_config_argument(configs[i]);
+			ret = meson_pinconf_set_drive_strength
+				(pc, pin, drive_strength_ua);
+			if (ret)
+				return ret;
+			break;
 		default:
 			return -ENOTSUPP;
 		}
@@ -288,12 +339,55 @@ static int meson_pinconf_get_pull(struct meson_pinctrl *pc, unsigned int pin)
 	return conf;
 }
 
+static int meson_pinconf_get_drive_strength(struct meson_pinctrl *pc,
+					    unsigned int pin,
+					    u16 *drive_strength_ua)
+{
+	struct meson_bank *bank;
+	unsigned int reg, bit;
+	unsigned int val;
+	int ret;
+
+	if (!pc->reg_ds)
+		return -ENOTSUPP;
+
+	ret = meson_get_bank(pc, pin, &bank);
+	if (ret)
+		return ret;
+
+	meson_calc_reg_and_bit(bank, pin, REG_DS, &reg, &bit);
+
+	ret = regmap_read(pc->reg_ds, reg, &val);
+	if (ret)
+		return ret;
+
+	switch ((val >> bit) & 0x3) {
+	case MESON_PINCONF_DRV_500UA:
+		*drive_strength_ua = 500;
+		break;
+	case MESON_PINCONF_DRV_2500UA:
+		*drive_strength_ua = 2500;
+		break;
+	case MESON_PINCONF_DRV_3000UA:
+		*drive_strength_ua = 3000;
+		break;
+	case MESON_PINCONF_DRV_4000UA:
+		*drive_strength_ua = 4000;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int meson_pinconf_get(struct pinctrl_dev *pcdev, unsigned int pin,
 			     unsigned long *config)
 {
 	struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
 	enum pin_config_param param = pinconf_to_config_param(*config);
 	u16 arg;
+	int ret;
 
 	switch (param) {
 	case PIN_CONFIG_BIAS_DISABLE:
@@ -304,6 +398,11 @@ static int meson_pinconf_get(struct pinctrl_dev *pcdev, unsigned int pin,
 		else
 			return -EINVAL;
 		break;
+	case PIN_CONFIG_DRIVE_STRENGTH_UA:
+		ret = meson_pinconf_get_drive_strength(pc, pin, &arg);
+		if (ret)
+			return ret;
+		break;
 	default:
 		return -ENOTSUPP;
 	}
diff --git a/drivers/pinctrl/meson/pinctrl-meson.h b/drivers/pinctrl/meson/pinctrl-meson.h
index 5eaab925f427..cd955fb7c2ce 100644
--- a/drivers/pinctrl/meson/pinctrl-meson.h
+++ b/drivers/pinctrl/meson/pinctrl-meson.h
@@ -71,9 +71,20 @@ enum meson_reg_type {
 	REG_DIR,
 	REG_OUT,
 	REG_IN,
+	REG_DS,
 	NUM_REG,
 };
 
+/**
+ * enum meson_pinconf_drv - value of drive-strength supported
+ */
+enum meson_pinconf_drv {
+	MESON_PINCONF_DRV_500UA,
+	MESON_PINCONF_DRV_2500UA,
+	MESON_PINCONF_DRV_3000UA,
+	MESON_PINCONF_DRV_4000UA,
+};
+
 /**
  * struct meson bank
  *
@@ -132,7 +143,8 @@ struct meson_pinctrl {
 		.num_groups = ARRAY_SIZE(fn ## _groups),		\
 	}
 
-#define BANK(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib)	\
+#define BANK_DS(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib,     \
+		dsr, dsb)                                                      \
 	{								\
 		.name		= n,					\
 		.first		= f,					\
@@ -145,9 +157,13 @@ struct meson_pinctrl {
 			[REG_DIR]	= { dr, db },			\
 			[REG_OUT]	= { or, ob },			\
 			[REG_IN]	= { ir, ib },			\
+			[REG_DS]	= { dsr, dsb },			\
 		},							\
 	 }
 
+#define BANK(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib) \
+	BANK_DS(n, f, l, fi, li, per, peb, pr, pb, dr, db, or, ob, ir, ib, 0, 0)
+
 #define MESON_PIN(x) PINCTRL_PIN(x, #x)
 
 /* Common pmx functions */
-- 
2.17.1


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^ permalink raw reply	[flat|nested] 9+ messages in thread

* [PATCH v4 6/6] pinctrl: meson: g12a: add DS bank value
  2019-05-09 16:29 [PATCH v4 0/6] Add drive-strength in Meson pinctrl driver Guillaume La Roque
                   ` (4 preceding siblings ...)
  2019-05-09 16:29 ` [PATCH v4 5/6] pinctrl: meson: add support of drive-strength-microamp Guillaume La Roque
@ 2019-05-09 16:29 ` Guillaume La Roque
  2019-05-09 17:34 ` [PATCH v4 0/6] Add drive-strength in Meson pinctrl driver Kevin Hilman
  6 siblings, 0 replies; 9+ messages in thread
From: Guillaume La Roque @ 2019-05-09 16:29 UTC (permalink / raw)
  To: linus.walleij, khilman
  Cc: linux-gpio, devicetree, linux-amlogic, linux-kernel, jbrunet

add drive-strength bank regiter and bit value for G12A SoC

Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
---
 drivers/pinctrl/meson/pinctrl-meson-g12a.c | 36 +++++++++++-----------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/drivers/pinctrl/meson/pinctrl-meson-g12a.c b/drivers/pinctrl/meson/pinctrl-meson-g12a.c
index d494492e98e9..3475cd7bd2af 100644
--- a/drivers/pinctrl/meson/pinctrl-meson-g12a.c
+++ b/drivers/pinctrl/meson/pinctrl-meson-g12a.c
@@ -1304,28 +1304,28 @@ static struct meson_pmx_func meson_g12a_aobus_functions[] = {
 };
 
 static struct meson_bank meson_g12a_periphs_banks[] = {
-	/* name  first  last  irq  pullen  pull  dir  out  in */
-	BANK("Z",    GPIOZ_0,    GPIOZ_15, 12, 27,
-	     4,  0,  4,  0,  12,  0,  13, 0,  14, 0),
-	BANK("H",    GPIOH_0,    GPIOH_8, 28, 36,
-	     3,  0,  3,  0,  9,  0,  10,  0,  11,  0),
-	BANK("BOOT", BOOT_0,     BOOT_15,  37, 52,
-	     0,  0,  0,  0,  0, 0,  1, 0,  2, 0),
-	BANK("C",    GPIOC_0,    GPIOC_7,  53, 60,
-	     1,  0,  1,  0,  3, 0,  4, 0,  5, 0),
-	BANK("A",    GPIOA_0,    GPIOA_15,  61, 76,
-	     5,  0,  5,  0,  16,  0,  17,  0,  18,  0),
-	BANK("X",    GPIOX_0,    GPIOX_19,   77, 96,
-	     2,  0,  2,  0,  6,  0,  7,  0,  8,  0),
+	/* name  first  last  irq  pullen  pull  dir  out  in  ds */
+	BANK_DS("Z",    GPIOZ_0,    GPIOZ_15, 12, 27,
+		4,  0,  4,  0,  12,  0,  13, 0,  14, 0, 5, 0),
+	BANK_DS("H",    GPIOH_0,    GPIOH_8, 28, 36,
+		3,  0,  3,  0,  9,  0,  10,  0,  11,  0, 4, 0),
+	BANK_DS("BOOT", BOOT_0,     BOOT_15,  37, 52,
+		0,  0,  0,  0,  0, 0,  1, 0,  2, 0, 0, 0),
+	BANK_DS("C",    GPIOC_0,    GPIOC_7,  53, 60,
+		1,  0,  1,  0,  3, 0,  4, 0,  5, 0, 1, 0),
+	BANK_DS("A",    GPIOA_0,    GPIOA_15,  61, 76,
+		5,  0,  5,  0,  16,  0,  17,  0,  18,  0, 6, 0),
+	BANK_DS("X",    GPIOX_0,    GPIOX_19,   77, 96,
+		2,  0,  2,  0,  6,  0,  7,  0,  8,  0, 2, 0),
 };
 
 static struct meson_bank meson_g12a_aobus_banks[] = {
-	/* name  first  last  irq  pullen  pull  dir  out  in  */
-	BANK("AO",   GPIOAO_0,  GPIOAO_11,  0, 11,
-	     3,  0,  2, 0,  0,  0,  4, 0,  1,  0),
+	/* name  first  last  irq  pullen  pull  dir  out  in  ds */
+	BANK_DS("AO", GPIOAO_0, GPIOAO_11, 0, 11, 3, 0, 2, 0, 0, 0, 4, 0, 1, 0,
+		0, 0),
 	/* GPIOE actually located in the AO bank */
-	BANK("E",   GPIOE_0,  GPIOE_2,   97, 99,
-	     3,  16,  2, 16,  0,  16,  4, 16,  1,  16),
+	BANK_DS("E", GPIOE_0, GPIOE_2, 97, 99, 3, 16, 2, 16, 0, 16, 4, 16, 1,
+		16, 1, 0),
 };
 
 static struct meson_pmx_bank meson_g12a_periphs_pmx_banks[] = {
-- 
2.17.1


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^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [PATCH v4 0/6] Add drive-strength in Meson pinctrl driver
  2019-05-09 16:29 [PATCH v4 0/6] Add drive-strength in Meson pinctrl driver Guillaume La Roque
                   ` (5 preceding siblings ...)
  2019-05-09 16:29 ` [PATCH v4 6/6] pinctrl: meson: g12a: add DS bank value Guillaume La Roque
@ 2019-05-09 17:34 ` Kevin Hilman
  6 siblings, 0 replies; 9+ messages in thread
From: Kevin Hilman @ 2019-05-09 17:34 UTC (permalink / raw)
  To: Guillaume La Roque, linus.walleij
  Cc: linux-gpio, devicetree, linux-amlogic, linux-kernel, jbrunet

Guillaume La Roque <glaroque@baylibre.com> writes:

> The purpose of this patchset is to add drive-strength support in meson pinconf
> driver. This is a new feature that was added on the g12a. It is critical for us
> to support this since many functions are failing with default pad drive-strength.
>
> The value achievable by the SoC are 0.5mA, 2.5mA, 3mA and 4mA and the DT property
> 'drive-strength' is expressed in mA.
> So this patch add another generic property "drive-strength-uA". The change to do so

Looks like you forgot to update the cover letter.

The new property in this series is actually named
"drive-strengh-micromap"

> would be minimal and could be benefit to other platforms later on.
>
> Cheers
> Guillaume
>
> Changes since v3:
> - remove dev_err in meson_get_drive_strength
> - cleanup code

You didn't mention the property rename.

Kevin

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^ permalink raw reply	[flat|nested] 9+ messages in thread

* Re: [PATCH v4 1/6] dt-bindings: pinctrl: add a 'drive-strength-microamp' property
  2019-05-09 16:29 ` [PATCH v4 1/6] dt-bindings: pinctrl: add a 'drive-strength-microamp' property Guillaume La Roque
@ 2019-05-09 17:35   ` Kevin Hilman
  0 siblings, 0 replies; 9+ messages in thread
From: Kevin Hilman @ 2019-05-09 17:35 UTC (permalink / raw)
  To: Guillaume La Roque, linus.walleij
  Cc: linux-gpio, devicetree, linux-amlogic, linux-kernel, jbrunet

Guillaume La Roque <glaroque@baylibre.com> writes:

> This property allow drive-strength parameter in uA instead of mA.
>
> Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
> ---
>  Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
> index cef2b5855d60..84adce9f2a75 100644
> --- a/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
> +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
> @@ -258,6 +258,7 @@ drive-push-pull		- drive actively high and low
>  drive-open-drain	- drive with open drain
>  drive-open-source	- drive with open source
>  drive-strength		- sink or source at most X mA
> +drive-strength-microamp	- sink or source at most X uA
>  input-enable		- enable input on pin (no effect on output, such as
>  			  enabling an input buffer)
>  input-disable		- disable input on pin (no effect on output, such as
> @@ -326,6 +327,8 @@ arguments are described below.
>  
>  - drive-strength takes as argument the target strength in mA.
>  
> +- drive-strength-uA takes as argument the target strength in uA.

s/uA/microamp/


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^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, back to index

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-05-09 16:29 [PATCH v4 0/6] Add drive-strength in Meson pinctrl driver Guillaume La Roque
2019-05-09 16:29 ` [PATCH v4 1/6] dt-bindings: pinctrl: add a 'drive-strength-microamp' property Guillaume La Roque
2019-05-09 17:35   ` Kevin Hilman
2019-05-09 16:29 ` [PATCH v4 2/6] pinctrl: generic: add new 'drive-strength-microamp' property support Guillaume La Roque
2019-05-09 16:29 ` [PATCH v4 3/6] dt-bindings: pinctrl: meson: Add drive-strength-microamp property Guillaume La Roque
2019-05-09 16:29 ` [PATCH v4 4/6] pinctrl: meson: Rework enable/disable bias part Guillaume La Roque
2019-05-09 16:29 ` [PATCH v4 5/6] pinctrl: meson: add support of drive-strength-microamp Guillaume La Roque
2019-05-09 16:29 ` [PATCH v4 6/6] pinctrl: meson: g12a: add DS bank value Guillaume La Roque
2019-05-09 17:34 ` [PATCH v4 0/6] Add drive-strength in Meson pinctrl driver Kevin Hilman

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