Re: [PATCH v1] spi: imx: mx51-ecspi: fix clk polarity and phase configuration for CS > 4

Oleksij Rempel
2022-05-23T15:40:38Z

On Mon, May 23, 2022 at 02:27:15PM +0100, Mark Brown wrote:
> On Mon, May 23, 2022 at 09:31:43AM +0200, Oleksij Rempel wrote:
>
> > - /* set chip select to use */
> > - ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select);
> > + if (spi->cs_gpiod) {
> > + chip_select = 0;
>
> What if someone mixed GPIO and regular chip selects and 0 is one of the
> in use chip selects? Ideally we should check for an unused chip select
> here, though the current change is still an improvement since we'll at
> least only write in the chip select field.

In case some HW variant has real issue with it, we will need to reduce
amount of supported HW CS and use blacklisted one for GPIOs.

Regards,
Oleksij
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