[PATCH v2 1/5] spi: spi-mem: Add driver for NXP FlexSPI controller

Frieder Schrempf frieder.schrempf at exceet.de
Tue Sep 18 01:22:11 PDT 2018


Hi Boris, Yogesh,

On 17.09.2018 13:37, Boris Brezillon wrote:
> Hi Yogesh,
> 
> On Mon, 17 Sep 2018 15:18:26 +0530
> Yogesh Gaur <yogeshnarayan.gaur at nxp.com> wrote:
> 
>> +
>> +	/*
>> +	 * R/W functions for big- or little-endian registers:
>> +	 * The FSPI controller's endianness is independent of
>> +	 * the CPU core's endianness. So far, although the CPU
>> +	 * core is little-endian the FSPI controller can use
>> +	 * big-endian or little-endian.
>> +	 */
>> +	if (of_property_read_bool(np, "big-endian")) {
>> +		f->write = fspi_writel_be;
>> +		f->read = fspi_readl_be;
>> +	} else {
>> +		f->write = fspi_writel;
>> +		f->read = fspi_readl;
>> +	}
> 
> Hm, isn't it something you can extract from the compatible string? I'd
> rather not allow users to set that in their DT if it's not something
> you can change.

This was copied from the QSPI driver, but I think Boris is right. This 
seems to be a fixed SOC-specific setting and we shouldn't set it in the 
DT. This applies to QSPI and FSPI alike.

Regards,
Frieder

> 
> Regards,
> 
> Boris
> 



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