Reaching DT, from driver attached to i2c/spi.

[Artturi Alm <artturi.alm%gmail.com@localhost>]

Hi,

how should/could this be done?
if bindings like "netbsd,..." are unwanted, i'll just hardcode and be
done with this, np. :]

use-case example called from _attach() below, see /* XXX .. */.
-Artturi


/*
 * node examples for i2c controllers in DT:
 * 			pressure@76 {
 *				compatible = "bosch,bme280";
 *				reg = <0x76>;
 *				netbsd,bmx-forced = < 0x01 >;
 *				netbsd,bmx-period = < 0x08 >;
 *				netbsd,bmx-standby = < 0x3d090 >;
 *				netbsd,bmx-oversample-temp = < 0x01 >;
 *				netbsd,bmx-oversample-pres = < 0x00 >;
 *				netbsd,bmx-oversample-humi = < 0x01 >;
 *			};
 *			pressure@77 {
 *				compatible = "bosch,bmp280";
 *				reg = <0x77>;
 *				netbsd,bmx-period = < 0x04 >;
 *				netbsd,bmx-standby = < 0x3d0900 >;
 *				netbsd,bmx-oversample-temp = < 0x01 >;
 *				netbsd,bmx-oversample-pres = < 0x01 >;
 *			};
 */
void
bmx_getconfig(struct bmx_softc *sc)
{
	int ph = sc->sc_node;
	/* XXX OF_getpropint ... */
#define	OF_getpropint(x,y,z)	((z))	/* XXX replace with ? z == default */
	int forced = OF_getpropint(ph, "netbsd,bmx-forced", 0);
	int period = OF_getpropint(ph, "netbsd,bmx-period", 1);
	uint32_t iirfilt = OF_getpropint(ph, "netbsd,bmx-filter", 0);
	uint32_t standby = OF_getpropint(ph, "netbsd,bmx-standby", 1000000);
	uint32_t os_temp = OF_getpropint(ph, "netbsd,bmx-oversample-temp", 1);
	uint32_t os_pres = OF_getpropint(ph, "netbsd,bmx-oversample-pres", 1);
	uint32_t os_humi = OF_getpropint(ph, "netbsd,bmx-oversample-humi", 1);

	sc->sc_node = ph; /* because __unused for now.. */

	if (sc->sc_state & BMX_S_GOTPARAMS)
		return;
	sc->sc_state |= BMX_S_GOTPARAMS;

	sc->sc_mode =
	    forced ? BMX280_CTRL_MEAS_FORCED : BMX280_CTRL_MEAS_NORMAL;

	iirfilt = bmx_config_filter(iirfilt);
	standby = bmx_config_standby(standby, BMX_W_HUMI(sc));
	sc->sc_config[0] = iirfilt | standby;

	os_humi = bmx_oversample(os_humi, BMX_HUMI);
	sc->sc_config[1] = os_humi;

	os_temp = bmx_oversample(os_temp, BMX_TEMP);
	os_pres = bmx_oversample(os_pres, BMX_PRES);
	sc->sc_config[2] = os_temp | os_pres;
}