[PATCH v3 1/2] lis3: add generic DT matching code
Daniel Mack
zonque at gmail.com
Mon Aug 6 02:18:42 EST 2012
Ping, anyone?
On 30.07.2012 09:36, Daniel Mack wrote:
> This patch adds logic to parse lis3 properties from a device tree node
> and store them in a freshly allocated lis3lv02d_platform_data.
>
> Note that the actual match tables are left out here. This part should
> happen in the drivers that bind to the individual busses (SPI/I2C/PCI).
>
> Also adds some DT bindinds documentation.
>
> Signed-off-by: Daniel Mack <zonque at gmail.com>
> ---
> Changes from v2:
> - kzalloc braino
>
> Changes from v1:
> - some typos in properties fixed
>
>
> Documentation/devicetree/bindings/misc/lis302.txt | 74 ++++++++++++
> drivers/misc/lis3lv02d/lis3lv02d.c | 137 ++++++++++++++++++++++
> drivers/misc/lis3lv02d/lis3lv02d.h | 4 +
> 3 files changed, 215 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/misc/lis302.txt
>
> diff --git a/Documentation/devicetree/bindings/misc/lis302.txt b/Documentation/devicetree/bindings/misc/lis302.txt
> new file mode 100644
> index 0000000..66230fd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/lis302.txt
> @@ -0,0 +1,74 @@
> +LIS302 accelerometer devicetree bindings
> +
> +This device is matched via its bus drivers, and has a number of properties
> +that apply in on the generic device (independent from the bus).
> +
> +
> +Required properties for the SPI bindings:
> + - compatible: should be set to "st,lis3lv02d_spi"
> + - reg: the chipselect index
> + - spi-max-frequency: maximal bus speed, should be set to 1000000 unless
> + constrained by external circuitry
> + - interrupts: the interrupt generated by the device
> +
> +
> +Optional properties for all bus drivers:
> +
> + - st,click-single-{x,y,z}: if present, tells the device to issue an
> + interrupt on single click events on the
> + x/y/z axis.
> + - st,click-double-{x,y,z}: if present, tells the device to issue an
> + interrupt on double click events on the
> + x/y/z axis.
> + - st,click-thresh-{x,y,z}: set the x/y/z axis threshold
> + - st,click-click-time-limit: click time limit, from 0 to 127.5msec
> + with step of 0.5 msec
> + - st,click-latency: click latency, from 0 to 255 msec with
> + step of 1 msec.
> + - st,click-window: click window, from 0 to 255 msec with
> + step of 1 msec.
> + - st,irq{1,2}-disable: disable IRQ 1/2
> + - st,irq{1,2}-ff-wu-1: raise IRQ 1/2 on FF_WU_1 condition
> + - st,irq{1,2}-ff-wu-2: raise IRQ 1/2 on FF_WU_2 condition
> + - st,irq{1,2}-data-ready: raise IRQ 1/2 on data ready contition
> + - st,irq{1,2}-click: raise IRQ 1/2 on click condition
> + - st,irq-open-drain: consider IRQ lines open-drain
> + - st,irq-active-low: make IRQ lines active low
> + - st,wu-duration-1: duration register for Free-Fall/Wake-Up
> + interrupt 1
> + - st,wu-duration-2: duration register for Free-Fall/Wake-Up
> + interrupt 2
> + - st,wakeup-{x,y,z}-{lo,hi}: set wakeup condition on x/y/z axis for
> + upper/lower limit
> + - st,highpass-cutoff-hz=: 1, 2, 4 or 8 for 1Hz, 2Hz, 4Hz or 8Hz of
> + highpass cut-off frequency
> + - st,hipass{1,2}-disable: disable highpass 1/2.
> + - st,default-rate=: set the default rate
> + - st,axis-{x,y,z}=: set the axis to map to the three coordinates
> +
> +
> +Example for a SPI device node:
> +
> + lis302 at 0 {
> + compatible = "st,lis302dl-spi";
> + reg = <0>;
> + spi-max-frequency = <1000000>;
> + interrupt-parent = <&gpio>;
> + interrupts = <104 0>;
> +
> + st,click-single-x;
> + st,click-single-y;
> + st,click-single-z;
> + st,click-thresh-x = <10>;
> + st,click-thresh-y = <10>;
> + st,click-thresh-z = <10>;
> + st,irq1-click;
> + st,irq2-click;
> + st,wakeup-x-lo;
> + st,wakeup-x-hi;
> + st,wakeup-y-lo;
> + st,wakeup-y-hi;
> + st,wakeup-z-lo;
> + st,wakeup-z-hi;
> + };
> +
> diff --git a/drivers/misc/lis3lv02d/lis3lv02d.c b/drivers/misc/lis3lv02d/lis3lv02d.c
> index a981e2a..1411fdc 100644
> --- a/drivers/misc/lis3lv02d/lis3lv02d.c
> +++ b/drivers/misc/lis3lv02d/lis3lv02d.c
> @@ -39,6 +39,7 @@
> #include <linux/miscdevice.h>
> #include <linux/pm_runtime.h>
> #include <linux/atomic.h>
> +#include <linux/of_device.h>
> #include "lis3lv02d.h"
>
> #define DRIVER_NAME "lis3lv02d"
> @@ -912,6 +913,138 @@ static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,
> }
> }
>
> +#ifdef CONFIG_OF
> +static int lis3lv02d_init_dt(struct lis3lv02d *lis3)
> +{
> + struct lis3lv02d_platform_data *pdata;
> + struct device_node *np = lis3->of_node;
> + u32 tmp;
> +
> + if (!lis3->of_node)
> + return 0;
> +
> + pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
> + if (!pdata)
> + return -ENOMEM;
> +
> + if (of_get_property(np, "st,click-single-x", NULL))
> + pdata->click_flags |= LIS3_CLICK_SINGLE_X;
> + if (of_get_property(np, "st,click-double-x", NULL))
> + pdata->click_flags |= LIS3_CLICK_DOUBLE_X;
> +
> + if (of_get_property(np, "st,click-single-y", NULL))
> + pdata->click_flags |= LIS3_CLICK_SINGLE_Y;
> + if (of_get_property(np, "st,click-double-y", NULL))
> + pdata->click_flags |= LIS3_CLICK_DOUBLE_Y;
> +
> + if (of_get_property(np, "st,click-single-z", NULL))
> + pdata->click_flags |= LIS3_CLICK_SINGLE_Z;
> + if (of_get_property(np, "st,click-double-z", NULL))
> + pdata->click_flags |= LIS3_CLICK_DOUBLE_Z;
> +
> + if (!of_property_read_u32(np, "st,click-threshold-x", &tmp))
> + pdata->click_thresh_x = tmp;
> + if (!of_property_read_u32(np, "st,click-threshold-y", &tmp))
> + pdata->click_thresh_y = tmp;
> + if (!of_property_read_u32(np, "st,click-threshold-z", &tmp))
> + pdata->click_thresh_z = tmp;
> +
> + if (!of_property_read_u32(np, "st,click-time-limit", &tmp))
> + pdata->click_time_limit = tmp;
> + if (!of_property_read_u32(np, "st,click-latency", &tmp))
> + pdata->click_latency = tmp;
> + if (!of_property_read_u32(np, "st,click-window", &tmp))
> + pdata->click_window = tmp;
> +
> + if (of_get_property(np, "st,irq1-disable", NULL))
> + pdata->irq_cfg |= LIS3_IRQ1_DISABLE;
> + if (of_get_property(np, "st,irq1-ff-wu-1", NULL))
> + pdata->irq_cfg |= LIS3_IRQ1_FF_WU_1;
> + if (of_get_property(np, "st,irq1-ff-wu-2", NULL))
> + pdata->irq_cfg |= LIS3_IRQ1_FF_WU_2;
> + if (of_get_property(np, "st,irq1-data-ready", NULL))
> + pdata->irq_cfg |= LIS3_IRQ1_DATA_READY;
> + if (of_get_property(np, "st,irq1-click", NULL))
> + pdata->irq_cfg |= LIS3_IRQ1_CLICK;
> +
> + if (of_get_property(np, "st,irq2-disable", NULL))
> + pdata->irq_cfg |= LIS3_IRQ2_DISABLE;
> + if (of_get_property(np, "st,irq2-ff-wu-1", NULL))
> + pdata->irq_cfg |= LIS3_IRQ2_FF_WU_1;
> + if (of_get_property(np, "st,irq2-ff-wu-2", NULL))
> + pdata->irq_cfg |= LIS3_IRQ2_FF_WU_2;
> + if (of_get_property(np, "st,irq2-data-ready", NULL))
> + pdata->irq_cfg |= LIS3_IRQ2_DATA_READY;
> + if (of_get_property(np, "st,irq2-click", NULL))
> + pdata->irq_cfg |= LIS3_IRQ2_CLICK;
> +
> + if (of_get_property(np, "st,irq-open-drain", NULL))
> + pdata->irq_cfg |= LIS3_IRQ_OPEN_DRAIN;
> + if (of_get_property(np, "st,irq-active-low", NULL))
> + pdata->irq_cfg |= LIS3_IRQ_ACTIVE_LOW;
> +
> + if (!of_property_read_u32(np, "st,wu-duration-1", &tmp))
> + pdata->duration1 = tmp;
> + if (!of_property_read_u32(np, "st,wu-duration-2", &tmp))
> + pdata->duration2 = tmp;
> +
> + if (of_get_property(np, "st,wakeup-x-lo", NULL))
> + pdata->wakeup_flags |= LIS3_WAKEUP_X_LO;
> + if (of_get_property(np, "st,wakeup-x-hi", NULL))
> + pdata->wakeup_flags |= LIS3_WAKEUP_X_HI;
> + if (of_get_property(np, "st,wakeup-y-lo", NULL))
> + pdata->wakeup_flags |= LIS3_WAKEUP_Y_LO;
> + if (of_get_property(np, "st,wakeup-y-hi", NULL))
> + pdata->wakeup_flags |= LIS3_WAKEUP_Y_HI;
> + if (of_get_property(np, "st,wakeup-z-lo", NULL))
> + pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO;
> + if (of_get_property(np, "st,wakeup-z-hi", NULL))
> + pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI;
> +
> + if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &tmp)) {
> + switch (tmp) {
> + case 1:
> + pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_1HZ;
> + break;
> + case 2:
> + pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_2HZ;
> + break;
> + case 4:
> + pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_4HZ;
> + break;
> + case 8:
> + pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_8HZ;
> + break;
> + }
> + }
> +
> + if (of_get_property(np, "st,hipass1-disable", NULL))
> + pdata->hipass_ctrl |= LIS3_HIPASS1_DISABLE;
> + if (of_get_property(np, "st,hipass2-disable", NULL))
> + pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE;
> +
> + if (of_get_property(np, "st,axis-x", NULL))
> + pdata->axis_x = tmp;
> + if (of_get_property(np, "st,axis-y", NULL))
> + pdata->axis_y = tmp;
> + if (of_get_property(np, "st,axis-z", NULL))
> + pdata->axis_z = tmp;
> +
> + if (of_get_property(np, "st,default-rate", NULL))
> + pdata->default_rate = tmp;
> +
> + lis3->pdata = pdata;
> +
> + return 0;
> +}
> +
> +#else
> +static int lis3lv02d_init_dt(struct lis3lv02d *lis3)
> +{
> + return 0;
> +}
> +#endif
> +
> /*
> * Initialise the accelerometer and the various subsystems.
> * Should be rather independent of the bus system.
> @@ -922,6 +1055,10 @@ int lis3lv02d_init_device(struct lis3lv02d *lis3)
> irq_handler_t thread_fn;
> int irq_flags = 0;
>
> + err = lis3lv02d_init_dt(lis3);
> + if (err < 0)
> + return err;
> +
> lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);
>
> switch (lis3->whoami) {
> diff --git a/drivers/misc/lis3lv02d/lis3lv02d.h b/drivers/misc/lis3lv02d/lis3lv02d.h
> index 2b1482a..a296f1d 100644
> --- a/drivers/misc/lis3lv02d/lis3lv02d.h
> +++ b/drivers/misc/lis3lv02d/lis3lv02d.h
> @@ -282,6 +282,10 @@ struct lis3lv02d {
>
> struct lis3lv02d_platform_data *pdata; /* for passing board config */
> struct mutex mutex; /* Serialize poll and selftest */
> +
> +#ifdef CONFIG_OF
> + struct device_node *of_node;
> +#endif
> };
>
> int lis3lv02d_init_device(struct lis3lv02d *lis3);
>
More information about the devicetree-discuss
mailing list