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mfd: stm32-timers: Use dma_request_chan() instead dma_request_slave_channel() 

dma_request_slave_channel() is a wrapper on top of dma_request_chan()
eating up the error code.

By using dma_request_chan() directly the driver can support deferred
probing against DMA.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Peter Ujfalusi 2020-01-07 12:59:59 +02:00 committed by Lee Jones
parent c085c66415
commit 8d7de07783
1 changed files with 23 additions and 9 deletions
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32
drivers/mfd/stm32-timers.c
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@ -167,10 +167,11 @@ static void stm32_timers_get_arr_size(struct stm32_timers *ddata)
regmap_write(ddata->regmap, TIM_ARR, 0x0);
}
static void stm32_timers_dma_probe(struct device *dev,
static int stm32_timers_dma_probe(struct device *dev,
struct stm32_timers *ddata)
{
int i;
int ret = 0;
char name[4];
init_completion(&ddata->dma.completion);
@ -179,14 +180,23 @@ static void stm32_timers_dma_probe(struct device *dev,
/* Optional DMA support: get valid DMA channel(s) or NULL */
for (i = STM32_TIMERS_DMA_CH1; i <= STM32_TIMERS_DMA_CH4; i++) {
snprintf(name, ARRAY_SIZE(name), "ch%1d", i + 1);
ddata->dma.chans[i] = dma_request_slave_channel(dev, name);
ddata->dma.chans[i] = dma_request_chan(dev, name);
}
ddata->dma.chans[STM32_TIMERS_DMA_UP] =
dma_request_slave_channel(dev, "up");
ddata->dma.chans[STM32_TIMERS_DMA_TRIG] =
dma_request_slave_channel(dev, "trig");
ddata->dma.chans[STM32_TIMERS_DMA_COM] =
dma_request_slave_channel(dev, "com");
ddata->dma.chans[STM32_TIMERS_DMA_UP] = dma_request_chan(dev, "up");
ddata->dma.chans[STM32_TIMERS_DMA_TRIG] = dma_request_chan(dev, "trig");
ddata->dma.chans[STM32_TIMERS_DMA_COM] = dma_request_chan(dev, "com");
for (i = STM32_TIMERS_DMA_CH1; i < STM32_TIMERS_MAX_DMAS; i++) {
if (IS_ERR(ddata->dma.chans[i])) {
/* Save the first error code to return */
if (PTR_ERR(ddata->dma.chans[i]) != -ENODEV && !ret)
ret = PTR_ERR(ddata->dma.chans[i]);
ddata->dma.chans[i] = NULL;
}
}
return ret;
}
static void stm32_timers_dma_remove(struct device *dev,
@ -230,7 +240,11 @@ static int stm32_timers_probe(struct platform_device *pdev)
stm32_timers_get_arr_size(ddata);
stm32_timers_dma_probe(dev, ddata);
ret = stm32_timers_dma_probe(dev, ddata);
if (ret) {
stm32_timers_dma_remove(dev, ddata);
return ret;
}
platform_set_drvdata(pdev, ddata);