linux-kernel - [PATCH 1/2] iio: adc: mt6577_auxadc: add optional 32k clock

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Message-ID: <f98ed7f3fc15a0614443a57427d46ce17ec2e0cc.1666190235.git.daniel@makrotopia.org>
Date:   Wed, 19 Oct 2022 15:37:35 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-iio@...r.kernel.org
Cc:     David Bauer <mail@...id-bauer.net>,
        Gwendal Grignou <gwendal@...omium.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] iio: adc: mt6577_auxadc: add optional 32k clock

MediaTek MT7986 and MT7981 require an additional clock to be brought up
for AUXADC. Add support for that in the driver, similar to how it's
done in MediaTek's SDK[1].

[1]: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/refs/heads/master/target/linux/mediatek/patches-5.4/500-auxadc-add-auxadc-32k-clk.patch
Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/iio/adc/mt6577_auxadc.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/iio/adc/mt6577_auxadc.c b/drivers/iio/adc/mt6577_auxadc.c
index 0e134777bdd248..e28e9691cae22a 100644
--- a/drivers/iio/adc/mt6577_auxadc.c
+++ b/drivers/iio/adc/mt6577_auxadc.c
@@ -42,6 +42,7 @@ struct mtk_auxadc_compatible {
 struct mt6577_auxadc_device {
 	void __iomem *reg_base;
 	struct clk *adc_clk;
+	struct clk *adc_32k_clk;
 	struct mutex lock;
 	const struct mtk_auxadc_compatible *dev_comp;
 };
@@ -227,6 +228,12 @@ static int mt6577_auxadc_resume(struct device *dev)
 		return ret;
 	}
 
+	ret = clk_prepare_enable(adc_dev->adc_32k_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);
@@ -241,6 +248,8 @@ static int mt6577_auxadc_suspend(struct device *dev)
 
 	mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
 			      0, MT6577_AUXADC_PDN_EN);
+
+	clk_disable_unprepare(adc_dev->adc_32k_clk);
 	clk_disable_unprepare(adc_dev->adc_clk);
 
 	return 0;
@@ -282,6 +291,17 @@ static int mt6577_auxadc_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	adc_dev->adc_32k_clk = devm_clk_get_optional(&pdev->dev, "32k");
+	if (IS_ERR(adc_dev->adc_32k_clk)) {
+		dev_err(&pdev->dev, "failed to get auxadc 32k clock\n");
+		return PTR_ERR(adc_dev->adc_32k_clk);
+	}
+	ret = clk_prepare_enable(adc_dev->adc_32k_clk);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to enable auxadc 32k clock\n");
+		return ret;
+	}
+
 	adc_clk_rate = clk_get_rate(adc_dev->adc_clk);
 	if (!adc_clk_rate) {
 		ret = -EINVAL;
@@ -311,6 +331,7 @@ static int mt6577_auxadc_probe(struct platform_device *pdev)
 	mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
 			      0, MT6577_AUXADC_PDN_EN);
 err_disable_clk:
+	clk_disable_unprepare(adc_dev->adc_32k_clk);
 	clk_disable_unprepare(adc_dev->adc_clk);
 	return ret;
 }
@@ -325,6 +346,7 @@ static int mt6577_auxadc_remove(struct platform_device *pdev)
 	mt6577_auxadc_mod_reg(adc_dev->reg_base + MT6577_AUXADC_MISC,
 			      0, MT6577_AUXADC_PDN_EN);
 
+	clk_disable_unprepare(adc_dev->adc_32k_clk);
 	clk_disable_unprepare(adc_dev->adc_clk);
 
 	return 0;
-- 
2.37.3