[PATCH 0/2] hwmon: (pmbus/ibm-cffps) Add version detection capability

[PATCH 0/2] hwmon: (pmbus/ibm-cffps) Add version detection capability

[Eddie James]

The IBM common form factor power supply driver may need to detect which PSU
version is connected, since some systems can use a variety of power supplies.
This series adds a new compatible string with no version number, and some code
to parse the CCIN of the PSU to determine which version is applicable.

Eddie James (2):
  dt-bindings: hwmon: Document ibm,cffps compatible string
  hwmon: (pmbus/ibm-cffps) Add version detection capability

 .../devicetree/bindings/hwmon/ibm,cffps1.txt       |  3 ++
 drivers/hwmon/pmbus/ibm-cffps.c                    | 37 +++++++++++++++++++---
 2 files changed, 36 insertions(+), 4 deletions(-)

-- 
1.8.3.1

[PATCH 1/2] dt-bindings: hwmon: Document ibm,cffps compatible string

[Eddie James]

Document this string that indicates that any version of the power supply
may be connected. In this case, the driver must detect the version
automatically.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 Documentation/devicetree/bindings/hwmon/ibm,cffps1.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/hwmon/ibm,cffps1.txt b/Documentation/devicetree/bindings/hwmon/ibm,cffps1.txt
index 1036f65..d9a2719 100644
--- a/Documentation/devicetree/bindings/hwmon/ibm,cffps1.txt
+++ b/Documentation/devicetree/bindings/hwmon/ibm,cffps1.txt
@@ -5,6 +5,9 @@ Required properties:
  - compatible				: Must be one of the following:
 						"ibm,cffps1"
 						"ibm,cffps2"
+						or "ibm,cffps" if the system
+						must support any version of the
+						power supply
  - reg = < I2C bus address >;		: Address of the power supply on the
 					  I2C bus.
 
-- 
1.8.3.1

[PATCH 2/2] hwmon: (pmbus/ibm-cffps) Add version detection capability

[Eddie James]

Some systems may plug in either version 1 or version 2 of the IBM common
form factor power supply. Add a version-less compatibility string that
tells the driver to try and detect which version of the power supply is
connected.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/hwmon/pmbus/ibm-cffps.c | 37 +++++++++++++++++++++++++++++++++----
 1 file changed, 33 insertions(+), 4 deletions(-)

diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
index d44745e..d61547e 100644
--- a/drivers/hwmon/pmbus/ibm-cffps.c
+++ b/drivers/hwmon/pmbus/ibm-cffps.c
@@ -3,6 +3,7 @@
  * Copyright 2017 IBM Corp.
  */
 
+#include <linux/bitfield.h>
 #include <linux/bitops.h>
 #include <linux/debugfs.h>
 #include <linux/device.h>
@@ -29,6 +30,10 @@
 #define CFFPS_INPUT_HISTORY_CMD			0xD6
 #define CFFPS_INPUT_HISTORY_SIZE		100
 
+#define CFFPS_CCIN_VERSION			GENMASK(15, 8)
+#define CFFPS_CCIN_VERSION_1			 0x2b
+#define CFFPS_CCIN_VERSION_2			 0x2e
+
 /* STATUS_MFR_SPECIFIC bits */
 #define CFFPS_MFR_FAN_FAULT			BIT(0)
 #define CFFPS_MFR_THERMAL_FAULT			BIT(1)
@@ -54,7 +59,7 @@ enum {
 	CFFPS_DEBUGFS_NUM_ENTRIES
 };
 
-enum versions { cffps1, cffps2 };
+enum versions { cffps1, cffps2, cffps_unknown };
 
 struct ibm_cffps_input_history {
 	struct mutex update_lock;
@@ -395,7 +400,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
 			   const struct i2c_device_id *id)
 {
 	int i, rc;
-	enum versions vs;
+	enum versions vs = cffps_unknown;
 	struct dentry *debugfs;
 	struct dentry *ibm_cffps_dir;
 	struct ibm_cffps *psu;
@@ -405,8 +410,27 @@ static int ibm_cffps_probe(struct i2c_client *client,
 		vs = (enum versions)md;
 	else if (id)
 		vs = (enum versions)id->driver_data;
-	else
-		vs = cffps1;
+
+	if (vs == cffps_unknown) {
+		u16 ccin_version = CFFPS_CCIN_VERSION_1;
+		int ccin = i2c_smbus_read_word_swapped(client, CFFPS_CCIN_CMD);
+
+		if (ccin > 0)
+			ccin_version = FIELD_GET(CFFPS_CCIN_VERSION, ccin);
+
+		switch (ccin_version) {
+		default:
+		case CFFPS_CCIN_VERSION_1:
+			vs = cffps1;
+			break;
+		case CFFPS_CCIN_VERSION_2:
+			vs = cffps2;
+			break;
+		}
+
+		/* Set the client name to include the version number. */
+		snprintf(client->name, I2C_NAME_SIZE, "cffps%d", vs + 1);
+	}
 
 	client->dev.platform_data = &ibm_cffps_pdata;
 	rc = pmbus_do_probe(client, id, &ibm_cffps_info[vs]);
@@ -465,6 +489,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
 static const struct i2c_device_id ibm_cffps_id[] = {
 	{ "ibm_cffps1", cffps1 },
 	{ "ibm_cffps2", cffps2 },
+	{ "ibm_cffps", cffps_unknown },
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
@@ -478,6 +503,10 @@ static int ibm_cffps_probe(struct i2c_client *client,
 		.compatible = "ibm,cffps2",
 		.data = (void *)cffps2
 	},
+	{
+		.compatible = "ibm,cffps",
+		.data = (void *)cffps_unknown
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);
-- 
1.8.3.1

Re: [PATCH 1/2] dt-bindings: hwmon: Document ibm,cffps compatible string

[Rob Herring]

On Wed,  9 Oct 2019 14:11:01 -0500, Eddie James wrote:
> Document this string that indicates that any version of the power supply
> may be connected. In this case, the driver must detect the version
> automatically.
> 
> Signed-off-by: Eddie James <eajames@linux.ibm.com>
> ---
>  Documentation/devicetree/bindings/hwmon/ibm,cffps1.txt | 3 +++
>  1 file changed, 3 insertions(+)
> 

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH 1/2] dt-bindings: hwmon: Document ibm,cffps compatible string

[Guenter Roeck]

On Wed, Oct 09, 2019 at 02:11:01PM -0500, Eddie James wrote:
> Document this string that indicates that any version of the power supply
> may be connected. In this case, the driver must detect the version
> automatically.
> 
> Signed-off-by: Eddie James <eajames@linux.ibm.com>
> Acked-by: Rob Herring <robh@kernel.org>

Applied.

Thanks,
Guenter

> ---
>  Documentation/devicetree/bindings/hwmon/ibm,cffps1.txt | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/ibm,cffps1.txt b/Documentation/devicetree/bindings/hwmon/ibm,cffps1.txt
> index 1036f65..d9a2719 100644
> --- a/Documentation/devicetree/bindings/hwmon/ibm,cffps1.txt
> +++ b/Documentation/devicetree/bindings/hwmon/ibm,cffps1.txt
> @@ -5,6 +5,9 @@ Required properties:
>   - compatible				: Must be one of the following:
>  						"ibm,cffps1"
>  						"ibm,cffps2"
> +						or "ibm,cffps" if the system
> +						must support any version of the
> +						power supply
>   - reg = < I2C bus address >;		: Address of the power supply on the
>  					  I2C bus.
>  

Re: [PATCH 2/2] hwmon: (pmbus/ibm-cffps) Add version detection capability

[Guenter Roeck]

On Wed, Oct 09, 2019 at 02:11:02PM -0500, Eddie James wrote:
> Some systems may plug in either version 1 or version 2 of the IBM common
> form factor power supply. Add a version-less compatibility string that
> tells the driver to try and detect which version of the power supply is
> connected.
> 
> Signed-off-by: Eddie James <eajames@linux.ibm.com>

Applied.

Thanks,
Guenter

> ---
>  drivers/hwmon/pmbus/ibm-cffps.c | 37 +++++++++++++++++++++++++++++++++----
>  1 file changed, 33 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
> index d44745e..d61547e 100644
> --- a/drivers/hwmon/pmbus/ibm-cffps.c
> +++ b/drivers/hwmon/pmbus/ibm-cffps.c
> @@ -3,6 +3,7 @@
>   * Copyright 2017 IBM Corp.
>   */
>  
> +#include <linux/bitfield.h>
>  #include <linux/bitops.h>
>  #include <linux/debugfs.h>
>  #include <linux/device.h>
> @@ -29,6 +30,10 @@
>  #define CFFPS_INPUT_HISTORY_CMD			0xD6
>  #define CFFPS_INPUT_HISTORY_SIZE		100
>  
> +#define CFFPS_CCIN_VERSION			GENMASK(15, 8)
> +#define CFFPS_CCIN_VERSION_1			 0x2b
> +#define CFFPS_CCIN_VERSION_2			 0x2e
> +
>  /* STATUS_MFR_SPECIFIC bits */
>  #define CFFPS_MFR_FAN_FAULT			BIT(0)
>  #define CFFPS_MFR_THERMAL_FAULT			BIT(1)
> @@ -54,7 +59,7 @@ enum {
>  	CFFPS_DEBUGFS_NUM_ENTRIES
>  };
>  
> -enum versions { cffps1, cffps2 };
> +enum versions { cffps1, cffps2, cffps_unknown };
>  
>  struct ibm_cffps_input_history {
>  	struct mutex update_lock;
> @@ -395,7 +400,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
>  			   const struct i2c_device_id *id)
>  {
>  	int i, rc;
> -	enum versions vs;
> +	enum versions vs = cffps_unknown;
>  	struct dentry *debugfs;
>  	struct dentry *ibm_cffps_dir;
>  	struct ibm_cffps *psu;
> @@ -405,8 +410,27 @@ static int ibm_cffps_probe(struct i2c_client *client,
>  		vs = (enum versions)md;
>  	else if (id)
>  		vs = (enum versions)id->driver_data;
> -	else
> -		vs = cffps1;
> +
> +	if (vs == cffps_unknown) {
> +		u16 ccin_version = CFFPS_CCIN_VERSION_1;
> +		int ccin = i2c_smbus_read_word_swapped(client, CFFPS_CCIN_CMD);
> +
> +		if (ccin > 0)
> +			ccin_version = FIELD_GET(CFFPS_CCIN_VERSION, ccin);
> +
> +		switch (ccin_version) {
> +		default:
> +		case CFFPS_CCIN_VERSION_1:
> +			vs = cffps1;
> +			break;
> +		case CFFPS_CCIN_VERSION_2:
> +			vs = cffps2;
> +			break;
> +		}
> +
> +		/* Set the client name to include the version number. */
> +		snprintf(client->name, I2C_NAME_SIZE, "cffps%d", vs + 1);
> +	}
>  
>  	client->dev.platform_data = &ibm_cffps_pdata;
>  	rc = pmbus_do_probe(client, id, &ibm_cffps_info[vs]);
> @@ -465,6 +489,7 @@ static int ibm_cffps_probe(struct i2c_client *client,
>  static const struct i2c_device_id ibm_cffps_id[] = {
>  	{ "ibm_cffps1", cffps1 },
>  	{ "ibm_cffps2", cffps2 },
> +	{ "ibm_cffps", cffps_unknown },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
> @@ -478,6 +503,10 @@ static int ibm_cffps_probe(struct i2c_client *client,
>  		.compatible = "ibm,cffps2",
>  		.data = (void *)cffps2
>  	},
> +	{
> +		.compatible = "ibm,cffps",
> +		.data = (void *)cffps_unknown
> +	},
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);