i2c: gpio: support write-only sda/scl w/o pull-up

There are slave devices that understand I2C but have read-only SDA and
SCL. Examples are FD650 7-segment LED controller and its derivatives.
Typical board designs don't even have a pull-up for both pins.
Handle the new attributes for write-only SDA and missing pull-up on
SDA/SCL.

For either pin the open-drain and has-no-pullup properties are
mutually-exclusive, what is documented in the DT property documentation.
We don't add an extra warning here because the open-drain properties
are marked deprecated anyway.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
[wsa: switched to device properties]
Signed-off-by: Wolfram Sang <wsa@kernel.org>

diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c
index e4a5984..1794c03 100644 (file)
--- a/drivers/i2c/busses/i2c-gpio.c
+++ b/drivers/i2c/busses/i2c-gpio.c
@@ -317,6 +317,12 @@ static void i2c_gpio_get_properties(struct device *dev,
                device_property_read_bool(dev, "i2c-gpio,scl-open-drain");
        pdata->scl_is_output_only =
                device_property_read_bool(dev, "i2c-gpio,scl-output-only");
+       pdata->sda_is_output_only =
+               device_property_read_bool(dev, "i2c-gpio,sda-output-only");
+       pdata->sda_has_no_pullup =
+               device_property_read_bool(dev, "i2c-gpio,sda-has-no-pullup");
+       pdata->scl_has_no_pullup =
+               device_property_read_bool(dev, "i2c-gpio,scl-has-no-pullup");
 }
 
 static struct gpio_desc *i2c_gpio_get_desc(struct device *dev,
@@ -393,7 +399,7 @@ static int i2c_gpio_probe(struct platform_device *pdev)
         * handle them as we handle any other output. Else we enforce open
         * drain as this is required for an I2C bus.
         */
-       if (pdata->sda_is_open_drain)
+       if (pdata->sda_is_open_drain || pdata->sda_has_no_pullup)
                gflags = GPIOD_OUT_HIGH;
        else
                gflags = GPIOD_OUT_HIGH_OPEN_DRAIN;
@@ -401,7 +407,7 @@ static int i2c_gpio_probe(struct platform_device *pdev)
        if (IS_ERR(priv->sda))
                return PTR_ERR(priv->sda);
 
-       if (pdata->scl_is_open_drain)
+       if (pdata->scl_is_open_drain || pdata->scl_has_no_pullup)
                gflags = GPIOD_OUT_HIGH;
        else
                gflags = GPIOD_OUT_HIGH_OPEN_DRAIN;
@@ -419,7 +425,8 @@ static int i2c_gpio_probe(struct platform_device *pdev)
 
        if (!pdata->scl_is_output_only)
                bit_data->getscl = i2c_gpio_getscl;
-       bit_data->getsda = i2c_gpio_getsda;
+       if (!pdata->sda_is_output_only)
+               bit_data->getsda = i2c_gpio_getsda;
 
        if (pdata->udelay)
                bit_data->udelay = pdata->udelay;

diff --git a/include/linux/platform_data/i2c-gpio.h b/include/linux/platform_data/i2c-gpio.h
index a907774..545639b 100644 (file)
--- a/include/linux/platform_data/i2c-gpio.h
+++ b/include/linux/platform_data/i2c-gpio.h
@@ -16,16 +16,25 @@
  *     isn't actively driven high when setting the output value high.
  *     gpio_get_value() must return the actual pin state even if the
  *     pin is configured as an output.
+ * @sda_is_output_only: SDA output drivers can't be turned off.
+ *     This is for clients that can only read SDA/SCL.
+ * @sda_has_no_pullup: SDA is used in a non-compliant way and has no pull-up.
+ *     Therefore disable open-drain.
  * @scl_is_open_drain: SCL is set up as open drain. Same requirements
  *     as for sda_is_open_drain apply.
  * @scl_is_output_only: SCL output drivers cannot be turned off.
+ * @scl_has_no_pullup: SCL is used in a non-compliant way and has no pull-up.
+ *     Therefore disable open-drain.
  */
 struct i2c_gpio_platform_data {
        int             udelay;
        int             timeout;
        unsigned int    sda_is_open_drain:1;
+       unsigned int    sda_is_output_only:1;
+       unsigned int    sda_has_no_pullup:1;
        unsigned int    scl_is_open_drain:1;
        unsigned int    scl_is_output_only:1;
+       unsigned int    scl_has_no_pullup:1;
 };
 
 #endif /* _LINUX_I2C_GPIO_H */