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

[Pali Rohár]

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?

If U-Boot coding style prefers second (your) variant, I do not have
a problem to change it.

Stefan, do you need to change this styling?

> >   	if (ddr4 && emmc)
> >   		env_set("fdtfile", "marvell/armada-3720-espressobin-v7-emmc.dtb");
> > 
>