From mboxrd@z Thu Jan 1 00:00:00 1970 From: Johan Hovold Subject: [PATCH 1/2] mfd: tps65910: add support for enabling external 32-kHz oscillator Date: Thu, 28 Jun 2012 12:20:21 +0200 Message-ID: <1340878822-28444-2-git-send-email-jhovold@gmail.com> References: <1340878822-28444-1-git-send-email-jhovold@gmail.com> Return-path: In-Reply-To: <1340878822-28444-1-git-send-email-jhovold@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: Samuel Ortiz Cc: Grant Likely , Rob Herring , devicetree-discuss@lists.ozlabs.org, linux-kernel@vger.kernel.org, Johan Hovold List-Id: devicetree@vger.kernel.org Add flag to platform data to enable external 32-kHz crystal oscillator (or square wave) input. The tps6591x can use either an internal 32-kHz RC oscillator or an external crystal (or square wave) to generate the 32-kHz clock. The default setting depends on the selected boot mode. In boot mode 00 the internal RC oscillator is used at power-on, but the external crystal oscillator (or square wave) can be enabled by clearing the ck32k_ctrl flag in the device control register. Note that there is no way to switch from the external crystal oscillator to the internal RC oscillator. Signed-off-by: Johan Hovold --- drivers/mfd/tps65910.c | 21 ++++++++++++++++++++- include/linux/mfd/tps65910.h | 1 + 2 files changed, 21 insertions(+), 1 deletions(-) diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c index be9e07b..b0526b7d 100644 --- a/drivers/mfd/tps65910.c +++ b/drivers/mfd/tps65910.c @@ -68,6 +68,25 @@ static const struct regmap_config tps65910_regmap_config = { .cache_type = REGCACHE_RBTREE, }; +static int __devinit tps65910_misc_init(struct tps65910 *tps65910, + struct tps65910_board *pmic_pdata) +{ + struct device *dev = tps65910->dev; + int ret; + + if (pmic_pdata->en_ck32k_xtal) { + ret = tps65910_reg_clear_bits(tps65910, + TPS65910_DEVCTRL, + DEVCTRL_CK32K_CTRL_MASK); + if (ret < 0) { + dev_err(dev, "clear ck32k_ctrl failed: %d\n", ret); + return ret; + } + } + + return 0; +} + static int __devinit tps65910_sleepinit(struct tps65910 *tps65910, struct tps65910_board *pmic_pdata) { @@ -243,7 +262,7 @@ static __devinit int tps65910_i2c_probe(struct i2c_client *i2c, init_data->irq_base = pmic_plat_data->irq_base; tps65910_irq_init(tps65910, init_data->irq, init_data); - + tps65910_misc_init(tps65910, pmic_plat_data); tps65910_sleepinit(tps65910, pmic_plat_data); return ret; diff --git a/include/linux/mfd/tps65910.h b/include/linux/mfd/tps65910.h index dd8dc0a..a989d2b 100644 --- a/include/linux/mfd/tps65910.h +++ b/include/linux/mfd/tps65910.h @@ -807,6 +807,7 @@ struct tps65910_board { int irq_base; int vmbch_threshold; int vmbch2_threshold; + bool en_ck32k_xtal; bool en_dev_slp; struct tps65910_sleep_keepon_data *slp_keepon; bool en_gpio_sleep[TPS6591X_MAX_NUM_GPIO]; -- 1.7.8.6