[U-Boot] [PATCH 2/6] mx6q: Add support for ECSPI through mxc_spi driver

[Eric Nelson]

On 01/17/2012 06:27 PM, Marek Vasut wrote:
>> On 01/17/2012 04:19 PM, Marek Vasut wrote:
>>>> Signed-off-by: Eric Nelson<eric.nelson at boundarydevices.com>
>>>> +/* ECSPI registers */
>>>> +struct cspi_regs {
>>>> +	u32 rxdata;
>>>> +	u32 txdata;
>>>> +	u32 ctrl;
>>>> +	u32 cfg;
>>>> +	u32 intr;
>>>> +	u32 dma;
>>>> +	u32 stat;
>>>> +	u32 period;
>>>> +};
>>>
>>> Sigh ... it's no fun I can have only one remark :-)
>>>
>>> Is this part common for all imx-es ?
>>
>> All i.MX6's
>>
>> This is a cut&  paste from MX51.
>>
>> I was tempted to introduce an 'mxc_ecspi.h' to merge the declaration
>> for i.MX5x and i.MX6 which share the ECSPI peripheral and 'mxc_cspi.h'
>> for i.MX31 and i.MX35 that share the CSPI peripheral.
>
> But you don't even need this outside of the spi driver so just put it into the
> spi driver and be done with it. That'll solve your duplication issue.
>
> M
>

I'll defer to Stefano on this one, since I did this in response
to his request:

> Right - and we already discussed in the past how to avoid to put
> specific SOC code inside the driver. In fact, the cspi_regs structure
> was already moved into the specific SOC header (imx-regs.h) - but the
> definitions of the single bits of the registers are still inside the
> driver, as well as the base address of the (e)cspi controllers.
>
> They should also be moved - take into acoount by implementing your
> changes for i.mx6

The struct cspi_regs is already present in mx31, mx35, and mx51 headers,
so I'm not breaking new ground here, only in the bitfield declarations.

	http://git.denx.de/?p=u-boot.git;a=blob;f=arch/arm/include/asm/arch-mx31/imx-regs.h;h=6a517ddd931ca0d1e598bd7456c4c611741602eb;hb=HEAD#l60
	http://git.denx.de/?p=u-boot.git;a=blob;f=arch/arm/include/asm/arch-mx35/imx-regs.h;h=df74508a93ee87ae986f7c2f48f6c5fb36626070;hb=HEAD#l279
	http://git.denx.de/?p=u-boot.git;a=blob;f=arch/arm/include/asm/arch-mx5/imx-regs.h;h=0ee88d25b7800ae9e6aed809d02dd19d9cac9c82;hb=HEAD#l423

My interpretation of Stefano's intent is to clean up the driver at the expense
of extra defines in the arch-specific headers.

Regards,


Eric