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Message-ID: <20110917171630.GY3523@ponder.secretlab.ca>
Date: Sat, 17 Sep 2011 11:16:30 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: Rhyland Klein <rklein@...dia.com>
Cc: Anton Vorontsov <cbouatmailru@...il.com>,
devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4] power: bq20z75: devicetree init support
On Wed, Sep 14, 2011 at 11:04:22AM -0700, Rhyland Klein wrote:
> Adding support to generate platform data when kernel is configured
> through device tree.
>
> Also adding the binding for the TI bq20z75 fuel gadge and the
> bq20z75 driver.
>
> Signed-off-by: Rhyland Klein <rklein@...dia.com>
Acked-by: Grant Likely <grant.likely@...retlab.ca>
> ---
> v2: Fixed typo in binding description
> v3: Changed to use "ti," for properties
> Changed to use single gpio entry for battery detect info.
> Removed unnecessary call to of_match_device.
> v4: squashed bindings and drivers changes together.
> fixed case where CONFIG_OF is not selected, to return existing
> pdata pointer if it exists.
>
> .../bindings/power_supply/ti_bq20z75.txt | 23 ++++++
> drivers/power/bq20z75.c | 75 ++++++++++++++++++++
> 2 files changed, 98 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/power_supply/ti_bq20z75.txt
>
> diff --git a/Documentation/devicetree/bindings/power_supply/ti_bq20z75.txt b/Documentation/devicetree/bindings/power_supply/ti_bq20z75.txt
> new file mode 100644
> index 0000000..7571294
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power_supply/ti_bq20z75.txt
> @@ -0,0 +1,23 @@
> +TI bq20z75
> +~~~~~~~~~~
> +
> +Required properties :
> + - compatible : "ti,bq20z75"
> +
> +Optional properties :
> + - ti,i2c-retry-count : The number of times to retry i2c transactions on i2c
> + IO failure.
> + - ti,poll-retry-count : The number of times to try looking for new status
> + after an external change notification.
> + - ti,battery-detect-gpios : The gpio which signals battery detection and
> + a flag specifying its polarity.
> +
> +Example:
> +
> + bq20z75@b {
> + compatible = "ti,bq20z75";
> + reg = < 0xb >;
> + ti,i2c-retry-count = <2>;
> + ti,poll-retry-count = <10>;
> + ti,battery-detect-gpios = <&gpio-controller 122 1>;
> + }
> diff --git a/drivers/power/bq20z75.c b/drivers/power/bq20z75.c
> index 9c5e5be..4c4669e 100644
> --- a/drivers/power/bq20z75.c
> +++ b/drivers/power/bq20z75.c
> @@ -613,6 +613,78 @@ static void bq20z75_delayed_work(struct work_struct *work)
> }
> }
>
> +#if defined(CONFIG_OF)
> +#include <linux/of_device.h>
> +static const struct of_device_id bq20z75_dt_ids[] = {
> + { .compatible = "ti,bq20z75" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(platform, bq20z75_dt_ids);
> +
> +static struct bq20z75_platform_data *bq20z75_of_populate_pdata(
> + struct i2c_client *client)
> +{
> + const struct of_device_id *dtid;
> + struct device_node *of_node = client->dev.of_node;
> + struct bq20z75_platform_data *pdata = client->dev.platform_data;
> + enum of_gpio_flags gpio_flags;
> + int rc;
> + u32 prop;
> +
> + /* verify this driver matches this device */
> + if (!of_node)
> + return NULL;
> +
> + /* if platform data is set, honor it */
> + if (pdata)
> + return pdata;
> +
> + /* first make sure at least one property is set, otherwise
> + * it won't change behavior from running without pdata.
> + */
> + if (!of_get_property(of_node, "ti,i2c-retry-count", NULL) &&
> + !of_get_property(of_node, "ti,poll-retry-count", NULL) &&
> + !of_get_property(of_node, "ti,battery-detect-gpios", NULL))
> + goto of_out;
> +
> + pdata = devm_kzalloc(&client->dev, sizeof(struct bq20z75_platform_data),
> + GFP_KERNEL);
> + if (!pdata)
> + goto of_out;
> +
> + rc = of_property_read_u32(of_node, "ti,i2c-retry-count", &prop);
> + if (!rc)
> + pdata->i2c_retry_count = prop;
> +
> + rc = of_property_read_u32(of_node, "ti,poll-retry-count", &prop);
> + if (!rc)
> + pdata->poll_retry_count = prop;
> +
> + if (!of_get_property(of_node, "ti,battery-detect-gpios", NULL)) {
> + pdata->battery_detect = -1;
> + goto of_out;
> + }
> +
> + pdata->battery_detect = of_get_named_gpio_flags(of_node,
> + "ti,battery-detect-gpios", 0, &gpio_flags);
> +
> + if (gpio_flags & OF_GPIO_ACTIVE_LOW)
> + pdata->battery_detect_present = 0;
> + else
> + pdata->battery_detect_present = 1;
> +
> +of_out:
> + return pdata;
> +}
> +#else
> +#define bq20z75_dt_ids NULL
> +static struct bq20z75_platform_data *bq20z75_of_populate_pdata(
> + struct i2c_client *client)
> +{
> + return client->dev.platform_data;
> +}
> +#endif
> +
> static int __devinit bq20z75_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> @@ -642,6 +714,8 @@ static int __devinit bq20z75_probe(struct i2c_client *client,
> bq20z75_device->power_supply.external_power_changed =
> bq20z75_external_power_changed;
>
> + pdata = bq20z75_of_populate_pdata(client);
> +
> if (pdata) {
> bq20z75_device->gpio_detect =
> gpio_is_valid(pdata->battery_detect);
> @@ -775,6 +849,7 @@ static struct i2c_driver bq20z75_battery_driver = {
> .id_table = bq20z75_id,
> .driver = {
> .name = "bq20z75-battery",
> + .of_match_table = bq20z75_dt_ids,
> },
> };
>
> --
> 1.7.6
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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