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Message-ID: <1500381332-17086-2-git-send-email-fabrice.gasnier@st.com>
Date: Tue, 18 Jul 2017 14:35:30 +0200
From: Fabrice Gasnier <fabrice.gasnier@...com>
To: <jic23@...nel.org>, <robh+dt@...nel.org>
CC: <linux@...linux.org.uk>, <mark.rutland@....com>,
<mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>,
<lars@...afoo.de>, <knaack.h@....de>, <pmeerw@...erw.net>,
<fabrice.gasnier@...com>, <benjamin.gaignard@...aro.org>,
<benjamin.gaignard@...com>, <linux-iio@...r.kernel.org>,
<devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3] iio: adc: stm32: fix common clock rate
Fixes commit 95e339b6e85d ("iio: adc: stm32: add support for STM32H7")
Fix common clock rate used then by stm32-adc sub-devices: take common
prescaler into account.
Fix ADC max clock rate on STM32H7 (fADC from datasheet)
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
---
drivers/iio/adc/stm32-adc-core.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/iio/adc/stm32-adc-core.c b/drivers/iio/adc/stm32-adc-core.c
index e09233b..6096763 100644
--- a/drivers/iio/adc/stm32-adc-core.c
+++ b/drivers/iio/adc/stm32-adc-core.c
@@ -64,7 +64,7 @@
#define STM32H7_CKMODE_MASK GENMASK(17, 16)
/* STM32 H7 maximum analog clock rate (from datasheet) */
-#define STM32H7_ADC_MAX_CLK_RATE 72000000
+#define STM32H7_ADC_MAX_CLK_RATE 36000000
/**
* stm32_adc_common_regs - stm32 common registers, compatible dependent data
@@ -148,14 +148,14 @@ static int stm32f4_adc_clk_sel(struct platform_device *pdev,
return -EINVAL;
}
- priv->common.rate = rate;
+ priv->common.rate = rate / stm32f4_pclk_div[i];
val = readl_relaxed(priv->common.base + STM32F4_ADC_CCR);
val &= ~STM32F4_ADC_ADCPRE_MASK;
val |= i << STM32F4_ADC_ADCPRE_SHIFT;
writel_relaxed(val, priv->common.base + STM32F4_ADC_CCR);
dev_dbg(&pdev->dev, "Using analog clock source at %ld kHz\n",
- rate / (stm32f4_pclk_div[i] * 1000));
+ priv->common.rate / 1000);
return 0;
}
@@ -250,7 +250,7 @@ static int stm32h7_adc_clk_sel(struct platform_device *pdev,
out:
/* rate used later by each ADC instance to control BOOST mode */
- priv->common.rate = rate;
+ priv->common.rate = rate / div;
/* Set common clock mode and prescaler */
val = readl_relaxed(priv->common.base + STM32H7_ADC_CCR);
@@ -260,7 +260,7 @@ static int stm32h7_adc_clk_sel(struct platform_device *pdev,
writel_relaxed(val, priv->common.base + STM32H7_ADC_CCR);
dev_dbg(&pdev->dev, "Using %s clock/%d source at %ld kHz\n",
- ckmode ? "bus" : "adc", div, rate / (div * 1000));
+ ckmode ? "bus" : "adc", div, priv->common.rate / 1000);
return 0;
}
--
1.9.1
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