| Message ID | 20221214233825.13050-5-laurent.pinchart+renesas@ideasonboard.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | media: i2c: max9286: Small new features | expand |
Hi Laurent On Thu, Dec 15, 2022 at 01:38:17AM +0200, Laurent Pinchart wrote: > From: Thomas Nizan <tnizan@witekio.com> > > Allow users to use one PoC regulator per port, instead of a global > regulator. > > The properties '^port[0-3]-poc-supply$' in the DT node are used to > indicate the regulators for individual ports. > > Signed-off-by: Thomas Nizan <tnizan@witekio.com> > Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > --- > Changes since v2: > > - Adapt to the poc-gpio support > > Changes since v1: > > - Use to_index() > - Use dev_err_probe() > - Fix error path in probe() > - Use devm_regulator_get_optional() instead of > devm_regulator_get_exclusive() > --- > drivers/media/i2c/max9286.c | 138 ++++++++++++++++++++++++++++++------ > 1 file changed, 115 insertions(+), 23 deletions(-) > > diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c > index 9c083cf14231..d79077939847 100644 > --- a/drivers/media/i2c/max9286.c > +++ b/drivers/media/i2c/max9286.c > @@ -139,6 +139,7 @@ > struct max9286_source { > struct v4l2_subdev *sd; > struct fwnode_handle *fwnode; > + struct regulator *regulator; > }; > > struct max9286_asd { > @@ -169,6 +170,7 @@ struct max9286_priv { > u32 init_rev_chan_mv; > u32 rev_chan_mv; > > + bool use_gpio_poc; > u32 gpio_poc[2]; > > struct v4l2_ctrl_handler ctrls; > @@ -1088,9 +1090,6 @@ static int max9286_parse_gpios(struct max9286_priv *priv) > struct device *dev = &priv->client->dev; > int ret; > > - /* GPIO values default to high */ > - priv->gpio_state = BIT(0) | BIT(1); > - > /* > * Parse the "gpio-poc" vendor property. If the property is not > * specified the camera power is controlled by a regulator. > @@ -1102,18 +1101,7 @@ static int max9286_parse_gpios(struct max9286_priv *priv) > * If gpio lines are not used for the camera power, register > * a gpio controller for consumers. > */ > - ret = max9286_register_gpio(priv); > - if (ret) > - return ret; > - > - priv->regulator = devm_regulator_get(dev, "poc"); > - if (IS_ERR(priv->regulator)) { > - return dev_err_probe(dev, PTR_ERR(priv->regulator), > - "Unable to get PoC regulator (%ld)\n", > - PTR_ERR(priv->regulator)); > - } > - > - return 0; > + return max9286_register_gpio(priv); > } > > /* If the property is specified make sure it is well formed. */ > @@ -1124,21 +1112,75 @@ static int max9286_parse_gpios(struct max9286_priv *priv) > return -EINVAL; > } > > + priv->use_gpio_poc = true; > return 0; > } > > +static int max9286_poc_power_on(struct max9286_priv *priv) > +{ > + struct max9286_source *source; > + unsigned int enabled = 0; > + int ret; > + > + /* Enable the global regulator if available. */ > + if (priv->regulator) > + return regulator_enable(priv->regulator); > + > + if (priv->use_gpio_poc) > + return max9286_gpio_set(priv, priv->gpio_poc[0], > + !priv->gpio_poc[1]); #define GPIO_ACTIVE_HIGH 0 #define GPIO_ACTIVE_LOW 1 So negating it is correct > + > + /* Otherwise use the per-port regulators. */ > + for_each_source(priv, source) { > + ret = regulator_enable(source->regulator); > + if (ret < 0) > + goto error; > + > + enabled |= BIT(to_index(priv, source)); > + } > + > + return 0; > + > +error: > + for_each_source(priv, source) { > + if (enabled & BIT(to_index(priv, source))) > + regulator_disable(source->regulator); > + } > + > + return ret; > +} > + > +static int max9286_poc_power_off(struct max9286_priv *priv) > +{ > + struct max9286_source *source; > + int ret = 0; > + > + if (priv->regulator) > + return regulator_disable(priv->regulator); > + > + if (priv->use_gpio_poc) > + return max9286_gpio_set(priv, priv->gpio_poc[0], > + priv->gpio_poc[1]); > + > + for_each_source(priv, source) { > + int err; > + > + err = regulator_disable(source->regulator); > + if (!ret) Should this be err ? And I wonder if ret |= regulator_disable(..) isn't enough > + ret = err; > + } > + > + return ret; > +} > + > static int max9286_poc_enable(struct max9286_priv *priv, bool enable) > { > int ret; > > - /* If the regulator is not available, use gpio to control power. */ > - if (!priv->regulator) > - ret = max9286_gpio_set(priv, priv->gpio_poc[0], > - enable ^ priv->gpio_poc[1]); > - else if (enable) > - ret = regulator_enable(priv->regulator); > + if (enable) > + ret = max9286_poc_power_on(priv); > else > - ret = regulator_disable(priv->regulator); > + ret = max9286_poc_power_off(priv); > > if (ret < 0) > dev_err(&priv->client->dev, "Unable to turn power %s\n", > @@ -1317,6 +1359,47 @@ static int max9286_parse_dt(struct max9286_priv *priv) > return 0; > } > > +static int max9286_get_poc_supplies(struct max9286_priv *priv) > +{ > + struct device *dev = &priv->client->dev; > + struct max9286_source *source; > + int ret; > + > + /* Start by getting the global regulator. */ > + priv->regulator = devm_regulator_get_optional(dev, "poc"); > + if (!IS_ERR(priv->regulator)) > + return 0; > + > + if (PTR_ERR(priv->regulator) != -ENODEV) { > + if (PTR_ERR(priv->regulator) != -EPROBE_DEFER) > + dev_err(dev, "Unable to get PoC regulator: %ld\n", > + PTR_ERR(priv->regulator)); > + return PTR_ERR(priv->regulator); Could this be dev_err_probe ? Or you want to avoid the dev_dbg message ? > + } > + > + /* If there's no global regulator, get per-port regulators. */ > + dev_dbg(dev, > + "No global PoC regulator, looking for per-port regulators\n"); > + priv->regulator = NULL; > + > + for_each_source(priv, source) { > + unsigned int index = to_index(priv, source); > + char name[10]; Will overflow with index > 9 ? But I don't think we can have more than 9 ports ? > + > + snprintf(name, sizeof(name), "port%u-poc", index); > + source->regulator = devm_regulator_get(dev, name); > + if (IS_ERR(source->regulator)) { > + ret = PTR_ERR(source->regulator); > + dev_err_probe(dev, ret, > + "Unable to get port %u PoC regulator\n", > + index); > + return ret; > + } > + } > + > + return 0; > +} > + > static int max9286_probe(struct i2c_client *client) > { > struct max9286_priv *priv; > @@ -1330,6 +1413,9 @@ static int max9286_probe(struct i2c_client *client) > > priv->client = client; > > + /* GPIO values default to high */ > + priv->gpio_state = BIT(0) | BIT(1); > + > priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable", > GPIOD_OUT_HIGH); > if (IS_ERR(priv->gpiod_pwdn)) > @@ -1362,7 +1448,13 @@ static int max9286_probe(struct i2c_client *client) > > ret = max9286_parse_dt(priv); > if (ret) > - goto err_powerdown; > + goto err_cleanup_dt; > + > + if (!priv->use_gpio_poc) { > + ret = max9286_get_poc_supplies(priv); > + if (ret) > + goto err_cleanup_dt; > + } > > ret = max9286_init(priv); > if (ret < 0) Do you need to powerdown here ? > -- > Regards, > > Laurent Pinchart >
Hi Jacopo, On Fri, Dec 16, 2022 at 10:52:51AM +0100, Jacopo Mondi wrote: > On Thu, Dec 15, 2022 at 01:38:17AM +0200, Laurent Pinchart wrote: > > From: Thomas Nizan <tnizan@witekio.com> > > > > Allow users to use one PoC regulator per port, instead of a global > > regulator. > > > > The properties '^port[0-3]-poc-supply$' in the DT node are used to > > indicate the regulators for individual ports. > > > > Signed-off-by: Thomas Nizan <tnizan@witekio.com> > > Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> > > --- > > Changes since v2: > > > > - Adapt to the poc-gpio support > > > > Changes since v1: > > > > - Use to_index() > > - Use dev_err_probe() > > - Fix error path in probe() > > - Use devm_regulator_get_optional() instead of > > devm_regulator_get_exclusive() > > --- > > drivers/media/i2c/max9286.c | 138 ++++++++++++++++++++++++++++++------ > > 1 file changed, 115 insertions(+), 23 deletions(-) > > > > diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c > > index 9c083cf14231..d79077939847 100644 > > --- a/drivers/media/i2c/max9286.c > > +++ b/drivers/media/i2c/max9286.c > > @@ -139,6 +139,7 @@ > > struct max9286_source { > > struct v4l2_subdev *sd; > > struct fwnode_handle *fwnode; > > + struct regulator *regulator; > > }; > > > > struct max9286_asd { > > @@ -169,6 +170,7 @@ struct max9286_priv { > > u32 init_rev_chan_mv; > > u32 rev_chan_mv; > > > > + bool use_gpio_poc; > > u32 gpio_poc[2]; > > > > struct v4l2_ctrl_handler ctrls; > > @@ -1088,9 +1090,6 @@ static int max9286_parse_gpios(struct max9286_priv *priv) > > struct device *dev = &priv->client->dev; > > int ret; > > > > - /* GPIO values default to high */ > > - priv->gpio_state = BIT(0) | BIT(1); > > - > > /* > > * Parse the "gpio-poc" vendor property. If the property is not > > * specified the camera power is controlled by a regulator. > > @@ -1102,18 +1101,7 @@ static int max9286_parse_gpios(struct max9286_priv *priv) > > * If gpio lines are not used for the camera power, register > > * a gpio controller for consumers. > > */ > > - ret = max9286_register_gpio(priv); > > - if (ret) > > - return ret; > > - > > - priv->regulator = devm_regulator_get(dev, "poc"); > > - if (IS_ERR(priv->regulator)) { > > - return dev_err_probe(dev, PTR_ERR(priv->regulator), > > - "Unable to get PoC regulator (%ld)\n", > > - PTR_ERR(priv->regulator)); > > - } > > - > > - return 0; > > + return max9286_register_gpio(priv); > > } > > > > /* If the property is specified make sure it is well formed. */ > > @@ -1124,21 +1112,75 @@ static int max9286_parse_gpios(struct max9286_priv *priv) > > return -EINVAL; > > } > > > > + priv->use_gpio_poc = true; > > return 0; > > } > > > > +static int max9286_poc_power_on(struct max9286_priv *priv) > > +{ > > + struct max9286_source *source; > > + unsigned int enabled = 0; > > + int ret; > > + > > + /* Enable the global regulator if available. */ > > + if (priv->regulator) > > + return regulator_enable(priv->regulator); > > + > > + if (priv->use_gpio_poc) > > + return max9286_gpio_set(priv, priv->gpio_poc[0], > > + !priv->gpio_poc[1]); > > #define GPIO_ACTIVE_HIGH 0 > #define GPIO_ACTIVE_LOW 1 > > So negating it is correct > > > + > > + /* Otherwise use the per-port regulators. */ > > + for_each_source(priv, source) { > > + ret = regulator_enable(source->regulator); > > + if (ret < 0) > > + goto error; > > + > > + enabled |= BIT(to_index(priv, source)); > > + } > > + > > + return 0; > > + > > +error: > > + for_each_source(priv, source) { > > + if (enabled & BIT(to_index(priv, source))) > > + regulator_disable(source->regulator); > > + } > > + > > + return ret; > > +} > > + > > +static int max9286_poc_power_off(struct max9286_priv *priv) > > +{ > > + struct max9286_source *source; > > + int ret = 0; > > + > > + if (priv->regulator) > > + return regulator_disable(priv->regulator); > > + > > + if (priv->use_gpio_poc) > > + return max9286_gpio_set(priv, priv->gpio_poc[0], > > + priv->gpio_poc[1]); > > + > > + for_each_source(priv, source) { > > + int err; > > + > > + err = regulator_disable(source->regulator); > > + if (!ret) > > Should this be err ? No, the intent is to capture the first error. It could be written if (err && !ret) but if the !ret condition is true and err == 0, executing ret = err will be a no-op, so just testing !ret is fine. > And I wonder if > ret |= regulator_disable(..) > > isn't enough If multiple regulator_disable() calls fail with different errors, ret will be garbage. > > + ret = err; > > + } > > + > > + return ret; > > +} > > + > > static int max9286_poc_enable(struct max9286_priv *priv, bool enable) > > { > > int ret; > > > > - /* If the regulator is not available, use gpio to control power. */ > > - if (!priv->regulator) > > - ret = max9286_gpio_set(priv, priv->gpio_poc[0], > > - enable ^ priv->gpio_poc[1]); > > - else if (enable) > > - ret = regulator_enable(priv->regulator); > > + if (enable) > > + ret = max9286_poc_power_on(priv); > > else > > - ret = regulator_disable(priv->regulator); > > + ret = max9286_poc_power_off(priv); > > > > if (ret < 0) > > dev_err(&priv->client->dev, "Unable to turn power %s\n", > > @@ -1317,6 +1359,47 @@ static int max9286_parse_dt(struct max9286_priv *priv) > > return 0; > > } > > > > +static int max9286_get_poc_supplies(struct max9286_priv *priv) > > +{ > > + struct device *dev = &priv->client->dev; > > + struct max9286_source *source; > > + int ret; > > + > > + /* Start by getting the global regulator. */ > > + priv->regulator = devm_regulator_get_optional(dev, "poc"); > > + if (!IS_ERR(priv->regulator)) > > + return 0; > > + > > + if (PTR_ERR(priv->regulator) != -ENODEV) { > > + if (PTR_ERR(priv->regulator) != -EPROBE_DEFER) > > + dev_err(dev, "Unable to get PoC regulator: %ld\n", > > + PTR_ERR(priv->regulator)); > > + return PTR_ERR(priv->regulator); > > Could this be dev_err_probe ? Or you want to avoid the dev_dbg message ? Good point, I'll fix that. > > + } > > + > > + /* If there's no global regulator, get per-port regulators. */ > > + dev_dbg(dev, > > + "No global PoC regulator, looking for per-port regulators\n"); > > + priv->regulator = NULL; > > + > > + for_each_source(priv, source) { > > + unsigned int index = to_index(priv, source); > > + char name[10]; > > Will overflow with index > 9 ? But I don't think we can have more than > 9 ports ? We're limited to 4 sources (MAX9286_NUM_GMSL is 4), so it should be fine. > > + > > + snprintf(name, sizeof(name), "port%u-poc", index); > > + source->regulator = devm_regulator_get(dev, name); > > + if (IS_ERR(source->regulator)) { > > + ret = PTR_ERR(source->regulator); > > + dev_err_probe(dev, ret, > > + "Unable to get port %u PoC regulator\n", > > + index); > > + return ret; > > + } > > + } > > + > > + return 0; > > +} > > + > > static int max9286_probe(struct i2c_client *client) > > { > > struct max9286_priv *priv; > > @@ -1330,6 +1413,9 @@ static int max9286_probe(struct i2c_client *client) > > > > priv->client = client; > > > > + /* GPIO values default to high */ > > + priv->gpio_state = BIT(0) | BIT(1); > > + > > priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable", > > GPIOD_OUT_HIGH); > > if (IS_ERR(priv->gpiod_pwdn)) > > @@ -1362,7 +1448,13 @@ static int max9286_probe(struct i2c_client *client) > > > > ret = max9286_parse_dt(priv); > > if (ret) > > - goto err_powerdown; > > + goto err_cleanup_dt; > > + > > + if (!priv->use_gpio_poc) { > > + ret = max9286_get_poc_supplies(priv); > > + if (ret) > > + goto err_cleanup_dt; > > + } > > > > ret = max9286_init(priv); > > if (ret < 0) > > Do you need to powerdown here ? I'm not sure to see what's wrong. The error path has err_cleanup_dt: max9286_cleanup_dt(priv); err_powerdown: gpiod_set_value_cansleep(priv->gpiod_pwdn, 0); return ret;
diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c index 9c083cf14231..d79077939847 100644 --- a/drivers/media/i2c/max9286.c +++ b/drivers/media/i2c/max9286.c @@ -139,6 +139,7 @@ struct max9286_source { struct v4l2_subdev *sd; struct fwnode_handle *fwnode; + struct regulator *regulator; }; struct max9286_asd { @@ -169,6 +170,7 @@ struct max9286_priv { u32 init_rev_chan_mv; u32 rev_chan_mv; + bool use_gpio_poc; u32 gpio_poc[2]; struct v4l2_ctrl_handler ctrls; @@ -1088,9 +1090,6 @@ static int max9286_parse_gpios(struct max9286_priv *priv) struct device *dev = &priv->client->dev; int ret; - /* GPIO values default to high */ - priv->gpio_state = BIT(0) | BIT(1); - /* * Parse the "gpio-poc" vendor property. If the property is not * specified the camera power is controlled by a regulator. @@ -1102,18 +1101,7 @@ static int max9286_parse_gpios(struct max9286_priv *priv) * If gpio lines are not used for the camera power, register * a gpio controller for consumers. */ - ret = max9286_register_gpio(priv); - if (ret) - return ret; - - priv->regulator = devm_regulator_get(dev, "poc"); - if (IS_ERR(priv->regulator)) { - return dev_err_probe(dev, PTR_ERR(priv->regulator), - "Unable to get PoC regulator (%ld)\n", - PTR_ERR(priv->regulator)); - } - - return 0; + return max9286_register_gpio(priv); } /* If the property is specified make sure it is well formed. */ @@ -1124,21 +1112,75 @@ static int max9286_parse_gpios(struct max9286_priv *priv) return -EINVAL; } + priv->use_gpio_poc = true; return 0; } +static int max9286_poc_power_on(struct max9286_priv *priv) +{ + struct max9286_source *source; + unsigned int enabled = 0; + int ret; + + /* Enable the global regulator if available. */ + if (priv->regulator) + return regulator_enable(priv->regulator); + + if (priv->use_gpio_poc) + return max9286_gpio_set(priv, priv->gpio_poc[0], + !priv->gpio_poc[1]); + + /* Otherwise use the per-port regulators. */ + for_each_source(priv, source) { + ret = regulator_enable(source->regulator); + if (ret < 0) + goto error; + + enabled |= BIT(to_index(priv, source)); + } + + return 0; + +error: + for_each_source(priv, source) { + if (enabled & BIT(to_index(priv, source))) + regulator_disable(source->regulator); + } + + return ret; +} + +static int max9286_poc_power_off(struct max9286_priv *priv) +{ + struct max9286_source *source; + int ret = 0; + + if (priv->regulator) + return regulator_disable(priv->regulator); + + if (priv->use_gpio_poc) + return max9286_gpio_set(priv, priv->gpio_poc[0], + priv->gpio_poc[1]); + + for_each_source(priv, source) { + int err; + + err = regulator_disable(source->regulator); + if (!ret) + ret = err; + } + + return ret; +} + static int max9286_poc_enable(struct max9286_priv *priv, bool enable) { int ret; - /* If the regulator is not available, use gpio to control power. */ - if (!priv->regulator) - ret = max9286_gpio_set(priv, priv->gpio_poc[0], - enable ^ priv->gpio_poc[1]); - else if (enable) - ret = regulator_enable(priv->regulator); + if (enable) + ret = max9286_poc_power_on(priv); else - ret = regulator_disable(priv->regulator); + ret = max9286_poc_power_off(priv); if (ret < 0) dev_err(&priv->client->dev, "Unable to turn power %s\n", @@ -1317,6 +1359,47 @@ static int max9286_parse_dt(struct max9286_priv *priv) return 0; } +static int max9286_get_poc_supplies(struct max9286_priv *priv) +{ + struct device *dev = &priv->client->dev; + struct max9286_source *source; + int ret; + + /* Start by getting the global regulator. */ + priv->regulator = devm_regulator_get_optional(dev, "poc"); + if (!IS_ERR(priv->regulator)) + return 0; + + if (PTR_ERR(priv->regulator) != -ENODEV) { + if (PTR_ERR(priv->regulator) != -EPROBE_DEFER) + dev_err(dev, "Unable to get PoC regulator: %ld\n", + PTR_ERR(priv->regulator)); + return PTR_ERR(priv->regulator); + } + + /* If there's no global regulator, get per-port regulators. */ + dev_dbg(dev, + "No global PoC regulator, looking for per-port regulators\n"); + priv->regulator = NULL; + + for_each_source(priv, source) { + unsigned int index = to_index(priv, source); + char name[10]; + + snprintf(name, sizeof(name), "port%u-poc", index); + source->regulator = devm_regulator_get(dev, name); + if (IS_ERR(source->regulator)) { + ret = PTR_ERR(source->regulator); + dev_err_probe(dev, ret, + "Unable to get port %u PoC regulator\n", + index); + return ret; + } + } + + return 0; +} + static int max9286_probe(struct i2c_client *client) { struct max9286_priv *priv; @@ -1330,6 +1413,9 @@ static int max9286_probe(struct i2c_client *client) priv->client = client; + /* GPIO values default to high */ + priv->gpio_state = BIT(0) | BIT(1); + priv->gpiod_pwdn = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_HIGH); if (IS_ERR(priv->gpiod_pwdn)) @@ -1362,7 +1448,13 @@ static int max9286_probe(struct i2c_client *client) ret = max9286_parse_dt(priv); if (ret) - goto err_powerdown; + goto err_cleanup_dt; + + if (!priv->use_gpio_poc) { + ret = max9286_get_poc_supplies(priv); + if (ret) + goto err_cleanup_dt; + } ret = max9286_init(priv); if (ret < 0)