[U-Boot] U-Boot of-platdata issue

[Kever Yang <kever.yang@rock-chips.com>]

Hi Simon, Jaehoon,

On 02/13/2017 05:51 PM, Jaehoon Chung wrote:
> On 02/13/2017 06:23 PM, Kever Yang wrote:
>> Hi Simon,
>>
>> On 01/16/2017 12:15 PM, Simon Glass wrote:
>>> Hi Kever,
>>>
>>> On 15 January 2017 at 18:28, Kever Yang <kever.yang@rock-chips.com> wrote:
>>>> Hi Simon,
>>>>
>>>>       I met two issue when using of-platdata
>>>>
>>>> 1. compitable name with '.'
>>>> I get compile error as below:
>>>> In file included from include/dt-structs.h:16:0,
>>>>                    from spl/dts/dt-platdata.c:3:
>>>> include/generated/dt-structs.h:26:35: error: expected identifier or ?(?
>>>> before numeric constant
>>>>    struct dtd_rockchip_rk3399_sdhci_5.1 {
>>>>                                      ^
>>>> spl/dts/dt-platdata.c:41:42: error: expected identifier or ?(? before
>>>> numeric constant
>>>>    static struct dtd_rockchip_rk3399_sdhci_5.1 dtv_sdhci_at_fe330000 = {
>>>>                                             ^
>>>> spl/dts/dt-platdata.c:55:15: error: ?dtv_sdhci_at_fe330000? undeclared here
>>>> (not in a function)
>>>>     .platdata = &dtv_sdhci_at_fe330000,
>>>>                  ^
>>>> make[2]: *** [spl/dts/dt-platdata.o] Error 1
>>>> make[1]: *** [spl/u-boot-spl] Error 2
>>>> make: *** [__build_one_by_one] Error 2
>>>>
>>>> The dts node starts like this:
>>>>           sdhci: sdhci at fe330000 {
>>>>                   u-boot,dm-pre-reloc;
>>>>                   compatible = "rockchip,rk3399-sdhci-5.1",
>>>> "arasan,sdhci-5.1";
>>>> ...
>>> That just involves replacing '.' with '_'. I sent a patch.
>>>
>>>> 2. multi compatible name
>>>> When a dts node have more than one compatible name, which is prefer to use?
>>>> for example, we have two dwmmc compatible name in rk3399, the tool is using
>>>> the first one,
>>>> while the source code using the last one.
>>>>
>>>> "drivers/mmc/rockchip_dw_mmc.c"
>>>>    23 struct rockchip_mmc_plat {
>>>>    24 #if CONFIG_IS_ENABLED(OF_PLATDATA)
>>>>    25         struct dtd_rockchip_rk3288_dw_mshc dtplat;
>>>>    26 #endif
>>>>    27         struct mmc_config cfg;
>>>>    28         struct mmc mmc;
>>>>    29 };
>>>> ...
>>>> dts node
>>>>           sdmmc: dwmmc at fe320000 {
>>>>                  compatible = "rockchip,rk3399-dw-mshc",
>>>>                                "rockchip,rk3288-dw-mshc";
>>> I'm not sure of the best solution here (other than putting more
>>> on-chip SRAM in your devices hint hint :-)
>>>
>>> One option is something like:
>>>
>>> struct rockchip_mmc_plat {
>>> #if CONFIG_IS_ENABLED(OF_PLATDATA)
>>> #ifdef CONFIG_ROCKCHIP_RK3288
>>>           struct dtd_rockchip_rk3288_dw_mshc dtplat;
>>> #elif defined(CONFIG_ROCKCHIP_RK399)
>>>           struct dtd_rockchip_rk399_dw_mshc dtplat;
>>> #endif
>>> #endif
>>>
>>> Obviously we don't want that as it is putting SoC-specific stuff in the driver.
>>>
>>> IMO the compatible strings are being misused a bit. Can there not be a
>>> compatible string which is common to all rockchip devices which use
>>> this IP? Something like "rockchip,dw-mshc-v1"? Then you can avoid
>>> adding a new compatible string every time you use the same IP in a
>>> device.
>> Agree, but... this is from kernel, we can't control it unless all kernel maintainers
>> have the same idea.
> does it use just "rockchip,dw-mshc"? Maybe this can be common compatible for rockchip.
> If it needs add the other compatible in future, it should be added the specific compatible at that time.
>

I don't think we will have a change in dts compatible for U-Boot dts, 
because we will always using dts
file from kernel, so we will use it as is.

We can use "rockchip,rk3288-dw-mshc" for rk3288 and rk3399, here is the 
document.
and for dw-mshc:
Documentation/devicetree/bindings/mmc/rockchip-dw-mshc.txt
* compatible: should be
         - "rockchip,rk2928-dw-mshc": for Rockchip RK2928 and following,
                                                         before RK3288
         - "rockchip,rk3288-dw-mshc": for Rockchip RK3288
         - "rockchip,rk3399-dw-mshc", "rockchip,rk3288-dw-mshc": for 
Rockchip RK3399

For the compatible name, there had some discuss before, like this patch:
https://lists.gt.net/linux/kernel/2372182

So for the of-platdata, we can use "rockchip,rk3288-dw-mshc" to generate 
the structure.

Thanks,
- Kever
>>> Another option would be for dtoc to #define each compatible string to
>>> the first one. If you think that would work, I could do a patch.
>>      I think we can try with the first one in the driver for of-platdata,
>> this would have problem for the first compatible name is different but
>> they share the same driver, like syscon. For syscon, you have resolved with
>> a special dirver, not sure if other driver has the same problem.
>>
>>      Could you help to make a patch for this solution?
>>
>> Thanks,
>> - Kever
>>> Regards,
>>> Simon
>>>
>>>
>>>
>>
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