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iio: adc: modify NPCM reset support

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Modify NPCM ADC reset support from
direct register access to reset controller support.

please make sure to modify NPCM adc device tree
parameters as described at nuvoton,npcm-adc.txt
document for using this change.

Note for anyone noting that this is a breaking change, this is on
a BMC and effectively in a close ecosystem so it is fine to rely
on DT and kernel being updated together.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Tomer Maimon 2020-02-03 17:09:17 +02:00 committed by Jonathan Cameron
parent 816abe42b8
commit db6bcb8c25
1 changed files with 9 additions and 21 deletions
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30
drivers/iio/adc/npcm_adc.c
View File

@ -14,6 +14,7 @@
#include <linux/regulator/consumer.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/reset.h>
struct npcm_adc {
bool int_status;
@ -23,13 +24,9 @@ struct npcm_adc {
struct clk *adc_clk;
wait_queue_head_t wq;
struct regulator *vref;
struct regmap *rst_regmap;
struct reset_control *reset;
};
/* NPCM7xx reset module */
#define NPCM7XX_IPSRST1_OFFSET 0x020
#define NPCM7XX_IPSRST1_ADC_RST BIT(27)
/* ADC registers */
#define NPCM_ADCCON 0x00
#define NPCM_ADCDATA 0x04
@ -106,13 +103,11 @@ static int npcm_adc_read(struct npcm_adc *info, int *val, u8 channel)
msecs_to_jiffies(10));
if (ret == 0) {
regtemp = ioread32(info->regs + NPCM_ADCCON);
if ((regtemp & NPCM_ADCCON_ADC_CONV) && info->rst_regmap) {
if (regtemp & NPCM_ADCCON_ADC_CONV) {
/* if conversion failed - reset ADC module */
regmap_write(info->rst_regmap, NPCM7XX_IPSRST1_OFFSET,
NPCM7XX_IPSRST1_ADC_RST);
reset_control_assert(info->reset);
msleep(100);
regmap_write(info->rst_regmap, NPCM7XX_IPSRST1_OFFSET,
0x0);
reset_control_deassert(info->reset);
msleep(100);
/* Enable ADC and start conversion module */
@ -186,7 +181,6 @@ static int npcm_adc_probe(struct platform_device *pdev)
struct npcm_adc *info;
struct iio_dev *indio_dev;
struct device *dev = &pdev->dev;
struct device_node *np = pdev->dev.of_node;
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
if (!indio_dev)
@ -199,6 +193,10 @@ static int npcm_adc_probe(struct platform_device *pdev)
if (IS_ERR(info->regs))
return PTR_ERR(info->regs);
info->reset = devm_reset_control_get(&pdev->dev, NULL);
if (IS_ERR(info->reset))
return PTR_ERR(info->reset);
info->adc_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(info->adc_clk)) {
dev_warn(&pdev->dev, "ADC clock failed: can't read clk\n");
@ -211,16 +209,6 @@ static int npcm_adc_probe(struct platform_device *pdev)
div = div >> NPCM_ADCCON_DIV_SHIFT;
info->adc_sample_hz = clk_get_rate(info->adc_clk) / ((div + 1) * 2);
if (of_device_is_compatible(np, "nuvoton,npcm750-adc")) {
info->rst_regmap = syscon_regmap_lookup_by_compatible
("nuvoton,npcm750-rst");
if (IS_ERR(info->rst_regmap)) {
dev_err(&pdev->dev, "Failed to find nuvoton,npcm750-rst\n");
ret = PTR_ERR(info->rst_regmap);
goto err_disable_clk;
}
}
irq = platform_get_irq(pdev, 0);
if (irq <= 0) {
ret = -EINVAL;