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SubjectRe: [PATCH] mtd: spi-nor: cadence-quadspi: add reset control
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On 08/04/19 10:20 PM, Dinh Nguyen wrote:
> Get the reset control for the QSPI controller and bring it out of reset.
>
> Suggested-by: Tien-Fong Chee <tien.fong.chee@intel.com>
> Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
> ---
> drivers/mtd/spi-nor/cadence-quadspi.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
> index 792628750eec..710a853f9d13 100644
> --- a/drivers/mtd/spi-nor/cadence-quadspi.c
> +++ b/drivers/mtd/spi-nor/cadence-quadspi.c
> @@ -34,6 +34,7 @@
> #include <linux/of.h>
> #include <linux/platform_device.h>
> #include <linux/pm_runtime.h>
> +#include <linux/reset.h>
> #include <linux/sched.h>
> #include <linux/spi/spi.h>
> #include <linux/timer.h>
> @@ -1336,6 +1337,7 @@ static int cqspi_probe(struct platform_device *pdev)
> struct cqspi_st *cqspi;
> struct resource *res;
> struct resource *res_ahb;
> + struct reset_control *rstc;
> const struct cqspi_driver_platdata *ddata;
> int ret;
> int irq;
> @@ -1362,6 +1364,14 @@ static int cqspi_probe(struct platform_device *pdev)
> return PTR_ERR(cqspi->clk);
> }
>
> + /* Obtain QSPI reset control */
> + rstc = devm_reset_control_get_exclusive(dev, NULL);
> + if (!IS_ERR(rstc)) {
> + reset_control_assert(rstc);
> + udelay(1);
> + reset_control_deassert(rstc);
> + }
> +

If reset is optional here why not use
devm_reset_control_get_optional_exclusive() and handle error codes (like
-EPROBE_DEFER) appropriately instead of ignoring them?

> /* Obtain and remap controller address. */
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> cqspi->iobase = devm_ioremap_resource(dev, res);
>

--
Regards
Vignesh

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