[U-Boot] [PATCH] Do not mux and setup SPI if disabled in the config

[Stefan Roese]

Hi Clemens,

On 05.08.2015 09:28, Clemens Gruber wrote:
>> On 04.08.2015 19:28, Clemens Gruber wrote:
>>> This allows baseboards without SPI to compile.
>>>
>>> Signed-off-by: Clemens Gruber <clemens.gruber at pqgruber.com>
>>> Cc: Markus Niebel <Markus.Niebel at tq-group.com>
>>> Cc: Tom Rini <trini at konsulko.com>
>>> ---
>>>    board/tqc/tqma6/tqma6.c | 6 ++++++
>>>    1 file changed, 6 insertions(+)
>>>
>>> diff --git a/board/tqc/tqma6/tqma6.c b/board/tqc/tqma6/tqma6.c
>>> index 29db838..5c4d104 100644
>>> --- a/board/tqc/tqma6/tqma6.c
>>> +++ b/board/tqc/tqma6/tqma6.c
>>> @@ -131,6 +131,8 @@ int board_mmc_init(bd_t *bis)
>>>    	return 0;
>>>    }
>>>
>>> +#if defined(CONFIG_MXC_SPI)
>>> +
>>>    static iomux_v3_cfg_t const tqma6_ecspi1_pads[] = {
>>>    	/* SS1 */
>>>    	NEW_PAD_CTRL(MX6_PAD_EIM_D19__GPIO3_IO19, SPI_PAD_CTRL),
>>> @@ -161,6 +163,8 @@ int board_spi_cs_gpio(unsigned bus, unsigned cs)
>>>    		(cs == CONFIG_SF_DEFAULT_CS)) ? TQMA6_SF_CS_GPIO : -1;
>>>    }
>>>
>>> +#endif /* defined(CONFIG_MXC_SPI) */
>>> +
>>>    static struct i2c_pads_info tqma6_i2c3_pads = {
>>>    	/* I2C3: on board LM75, M24C64,  */
>>>    	.scl = {
>>> @@ -201,7 +205,9 @@ int board_init(void)
>>>    	/* address of boot parameters */
>>>    	gd->bd->bi_boot_params = PHYS_SDRAM + 0x100;
>>>
>>> +#if defined(CONFIG_MXC_SPI)
>>>    	tqma6_iomuxc_spi();
>>> +#endif
>>>    	tqma6_setup_i2c();
>>
>> Hmmm. This should not be necessary. Please take a look at the wru4
>> baseboard addition that is already in mainline. Especially this
>> patch:
>
> I noticed your patch but then we would still have to define
> CONFIG_SF_DEFAULT_BUS and CONFIG_SF_DEFAULT_CS in our board config or include
> the tqma6.h config, which defines too many things we do not need.

I would have expected that all boards using these TQ SoM's include this 
config header.

> The problem is, we have different clocks and more c files, so we use a separate
> board directory and a separate board config without SPI defines and just use
> obj-y += ../../tqc/tqma6/tqma6.o in front of our object files in the Makefile.
>
> If we don't exclude those SPI parts, we would either have to define those SPI
> config options (which does not make sense) or move all of our board code in one
> file under tqc/tqma6 which is not an option, we also define additional clocks
> via a separate IMX_CONFIG file.
>
> Wouldn't it be better to always exclude this code when not using SPI instead of
> weakly defining the tqma6_iomuxc_spi function?
> Then small baseboards could be put in tqc/tqma6 and larger projects could still
> just link to tqma6.o and put all their stuff in a separate board directory.

How about this patch:

diff --git a/board/tqc/tqma6/tqma6.c b/board/tqc/tqma6/tqma6.c
index 29db838..345930f 100644
--- a/board/tqc/tqma6/tqma6.c
+++ b/board/tqc/tqma6/tqma6.c
@@ -28,6 +28,13 @@

  #include "tqma6_bb.h"

+#ifndef CONFIG_SF_DEFAULT_BUS
+#define CONFIG_SF_DEFAULT_BUS  0
+#endif
+#ifndef CONFIG_SF_DEFAULT_CS
+#define CONFIG_SF_DEFAULT_CS   0
+#endif

Does this work for you?

Thanks,
Stefan