From: Zhiyong Tao <zhiyong.tao@mediatek.com>
To: <robh+dt@kernel.org>, <jic23@kernel.org>, <knaack.h@gmx.de>,
<lars@metafoo.de>, <pmeerw@pmeerw.net>
Cc: <srv_heupstream@mediatek.com>, <liguo.zhang@mediatek.com>,
<yingjoe.chen@mediatek.com>, <sean.wang@mediatek.com>,
<matthias.bgg@gmail.com>, <s.hauer@pengutronix.de>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-iio@vger.kernel.org>, <linux-mediatek@lists.infradead.org>,
Zhiyong Tao <zhiyong.tao@mediatek.com>
Subject: [PATCH v2 2/3] iio: adc: mt7622: add support for suspend/resume.
Date: Mon, 26 Jun 2017 14:11:41 +0800 [thread overview]
Message-ID: <1498457502-3669-3-git-send-email-zhiyong.tao@mediatek.com> (raw)
In-Reply-To: <1498457502-3669-1-git-send-email-zhiyong.tao@mediatek.com>
This patch supports auxadc suspend/resume flow.
Disable auxadc clk and power in suspend function.
Enable axuadc clk and power in resume function.
Signed-off-by: Zhiyong Tao <zhiyong.tao@mediatek.com>
---
drivers/iio/adc/mt6577_auxadc.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/drivers/iio/adc/mt6577_auxadc.c b/drivers/iio/adc/mt6577_auxadc.c
index 2d104c8..c174b73 100644
--- a/drivers/iio/adc/mt6577_auxadc.c
+++ b/drivers/iio/adc/mt6577_auxadc.c
@@ -184,6 +184,39 @@ static int mt6577_auxadc_read_raw(struct iio_dev *indio_dev,
.read_raw = &mt6577_auxadc_read_raw,
};
+#ifdef CONFIG_PM_SLEEP
+static int __maybe_unused mt6577_auxadc_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);
+ int ret;
+
+ ret = clk_prepare_enable(adc_dev->adc_clk);
+ if (ret) {
+ pr_err("failed to enable auxadc clock\n");
+ return ret;
+ }
+
+ mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
+ MT6577_AUXADC_PDN_EN, 0);
+ mdelay(MT6577_AUXADC_POWER_READY_MS);
+
+ return 0;
+}
+
+static int __maybe_unused mt6577_auxadc_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct mt6577_auxadc_device *adc_dev = iio_priv(indio_dev);
+
+ mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
+ 0, MT6577_AUXADC_PDN_EN);
+ clk_disable_unprepare(adc_dev->adc_clk);
+
+ return 0;
+}
+#endif
+
static int mt6577_auxadc_probe(struct platform_device *pdev)
{
struct mt6577_auxadc_device *adc_dev;
@@ -269,6 +302,10 @@ static int mt6577_auxadc_remove(struct platform_device *pdev)
return 0;
}
+static SIMPLE_DEV_PM_OPS(mt6577_auxadc_pm_ops,
+ mt6577_auxadc_suspend,
+ mt6577_auxadc_resume);
+
static const struct of_device_id mt6577_auxadc_of_match[] = {
{ .compatible = "mediatek,mt2701-auxadc", },
{ .compatible = "mediatek,mt8173-auxadc", },
@@ -280,6 +317,7 @@ static int mt6577_auxadc_remove(struct platform_device *pdev)
.driver = {
.name = "mt6577-auxadc",
.of_match_table = mt6577_auxadc_of_match,
+ .pm = &mt6577_auxadc_pm_ops,
},
.probe = mt6577_auxadc_probe,
.remove = mt6577_auxadc_remove,
--
1.7.9.5
next prev parent reply other threads:[~2017-06-26 6:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-26 6:11 [PATCH v2 0/3] ADC: Mediatek auxadc driver for mt7622 Zhiyong Tao
2017-06-26 6:11 ` [PATCH v2 1/3] dt-bindings: adc: mt7622: add binding document Zhiyong Tao
2017-06-28 16:46 ` Rob Herring
2017-07-01 9:18 ` Jonathan Cameron
2017-06-26 6:11 ` Zhiyong Tao [this message]
2017-07-01 9:19 ` [PATCH v2 2/3] iio: adc: mt7622: add support for suspend/resume Jonathan Cameron
2017-06-26 6:11 ` [PATCH v2 3/3] iio: adc: mt7622: Add compatible node for mt7622 Zhiyong Tao
2017-07-01 9:21 ` Jonathan Cameron
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