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iio: dac: stm32: add support for stm32f4 

This adds support for STM32F4 Digital-To-Analog converter.
Add compatible configuration data to handle hfsel (not present
in stm32f4).

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Fabrice Gasnier 2017-07-10 15:23:59 +02:00 committed by Jonathan Cameron
parent 0c1a1b6cba
commit 9d9ebe64dc
1 changed files with 31 additions and 7 deletions
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38
drivers/iio/dac/stm32-dac-core.c
View File

@ -42,6 +42,14 @@ struct stm32_dac_priv {
struct stm32_dac_common common;
};
/**
* struct stm32_dac_cfg - DAC configuration
* @has_hfsel: DAC has high frequency control
*/
struct stm32_dac_cfg {
bool has_hfsel;
};
static struct stm32_dac_priv *to_stm32_dac_priv(struct stm32_dac_common *com)
{
return container_of(com, struct stm32_dac_priv, common);
@ -57,6 +65,7 @@ static const struct regmap_config stm32_dac_regmap_cfg = {
static int stm32_dac_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct stm32_dac_cfg *cfg;
struct stm32_dac_priv *priv;
struct regmap *regmap;
struct resource *res;
@ -69,6 +78,8 @@ static int stm32_dac_probe(struct platform_device *pdev)
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
cfg = (const struct stm32_dac_cfg *)
of_match_device(dev->driver->of_match_table, dev)->data;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
mmio = devm_ioremap_resource(dev, res);
@ -121,12 +132,16 @@ static int stm32_dac_probe(struct platform_device *pdev)
reset_control_deassert(priv->rst);
}
/* When clock speed is higher than 80MHz, set HFSEL */
priv->common.hfsel = (clk_get_rate(priv->pclk) > 80000000UL);
ret = regmap_update_bits(regmap, STM32_DAC_CR, STM32H7_DAC_CR_HFSEL,
priv->common.hfsel ? STM32H7_DAC_CR_HFSEL : 0);
if (ret)
goto err_pclk;
if (cfg && cfg->has_hfsel) {
/* When clock speed is higher than 80MHz, set HFSEL */
priv->common.hfsel = (clk_get_rate(priv->pclk) > 80000000UL);
ret = regmap_update_bits(regmap, STM32_DAC_CR,
STM32H7_DAC_CR_HFSEL,
priv->common.hfsel ?
STM32H7_DAC_CR_HFSEL : 0);
if (ret)
goto err_pclk;
}
platform_set_drvdata(pdev, &priv->common);
@ -158,8 +173,17 @@ static int stm32_dac_remove(struct platform_device *pdev)
return 0;
}
static const struct stm32_dac_cfg stm32h7_dac_cfg = {
.has_hfsel = true,
};
static const struct of_device_id stm32_dac_of_match[] = {
{ .compatible = "st,stm32h7-dac-core", },
{
.compatible = "st,stm32f4-dac-core",
}, {
.compatible = "st,stm32h7-dac-core",
.data = (void *)&stm32h7_dac_cfg,
},
{},
};
MODULE_DEVICE_TABLE(of, stm32_dac_of_match);