[PATCH 4/4] arm: mvebu: Espressobin: Detect presence of emmc at runtime

[Stefan Roese]

On 05.12.20 13:44, Pali Rohár wrote:
> On Thursday 03 December 2020 17:30:44 Stefan Roese wrote:
>> On 03.12.20 16:56, Pali Rohár wrote:
>>> On Wednesday 02 December 2020 15:35:08 Andre Heider wrote:
>>>> On 25/11/2020 19:20, Pali Rohár wrote:
>>>>> Try to initialize emmc in board_late_init() and if it fails then we know
>>>>> that emmc device is not connected.
>>>>>
>>>>> This allows to use in U-Boot just one DTS file for all Espressobin variants
>>>>> and also to correctly set fdtfile env variable for Linux kernel.
>>>>>
>>>>> Signed-off-by: Pali Rohár <pali at kernel.org>
>>>>> Tested-by: Gérald Kerma <gerald at gk2.net>
>>>>
>>>> Small nit below, with that:
>>>> Reviewed-by: Andre Heider <a.heider at gmail.com>
>>>>
>>>>> ---
>>>>>     board/Marvell/mvebu_armada-37xx/board.c | 6 +++++-
>>>>>     1 file changed, 5 insertions(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/board/Marvell/mvebu_armada-37xx/board.c b/board/Marvell/mvebu_armada-37xx/board.c
>>>>> index 73d69e0388..f67b04b78c 100644
>>>>> --- a/board/Marvell/mvebu_armada-37xx/board.c
>>>>> +++ b/board/Marvell/mvebu_armada-37xx/board.c
>>>>> @@ -8,6 +8,7 @@
>>>>>     #include <env.h>
>>>>>     #include <i2c.h>
>>>>>     #include <init.h>
>>>>> +#include <mmc.h>
>>>>>     #include <phy.h>
>>>>>     #include <asm/io.h>
>>>>>     #include <asm/arch/cpu.h>
>>>>> @@ -83,6 +84,7 @@ int board_init(void)
>>>>>     #ifdef CONFIG_BOARD_LATE_INIT
>>>>>     int board_late_init(void)
>>>>>     {
>>>>> +	struct mmc *mmc_dev;
>>>>>     	bool ddr4, emmc;
>>>>>     	if (env_get("fdtfile"))
>>>>> @@ -95,7 +97,9 @@ int board_late_init(void)
>>>>>     	ddr4 = ((readl(A3700_CH0_MC_CTRL2_REG) >> A3700_MC_CTRL2_SDRAM_TYPE_OFFS)
>>>>>     		& A3700_MC_CTRL2_SDRAM_TYPE_MASK) == A3700_MC_CTRL2_SDRAM_TYPE_DDR4;
>>>>> -	emmc = of_machine_is_compatible("globalscale,espressobin-emmc");
>>>>> +	/* eMMC is mmc dev num 1 */
>>>>> +	mmc_dev = find_mmc_device(1);
>>>>> +	emmc = (mmc_dev && mmc_init(mmc_dev) == 0);
>>>>
>>>> I think you meant "mmc_dev && (mmc_init(mmc_dev) == 0);"?
>>>
>>> Hm... no... I usually do not put parenthesis around || and && operators.
>>>
>>> But both variants are same right?
>>
>> Yours still has parenthesis around the (a && b) part, which is not
>> needed. But this is nitpicking AFAIAC.
>>
>>> If U-Boot coding style prefers second (your) variant, I do not have
>>> a problem to change it.
>>
>> checkpatch should complain if something does not match the coding style.
>>
>>> Stefan, do you need to change this styling?
>>
>> No, not from my point of view.
> 
> Ok! So based on Philipp and Andre replies, would you be sending these
> patches to 2021.01 release? As for this release is scheduled usage of
> "globalscale,espressobin-emmc" compatible string in U-Boot, these
> patches are removing them and previous versions do not used them.

Yes, I'm preparing a pull request just now.

Thanks,
Stefan