linux-kernel - RE: [PATCH 1/2] riscv: defconfig: enable spi nor on Hifive Unleashed A00 board.

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Date:   Sun, 10 May 2020 15:32:33 +0000
From:   Sagar Kadam <sagar.kadam@...ive.com>
To:     Andreas Schwab <schwab@...ux-m68k.org>,
        Anup Patel <anup@...infault.org>
CC:     Palmer Dabbelt <palmer@...belt.com>,
        "vigneshr@...com" <vigneshr@...com>,
        "tudor.ambarus@...rochip.com" <tudor.ambarus@...rochip.com>,
        "richard@....at" <richard@....at>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>
Subject: RE: [PATCH 1/2] riscv: defconfig: enable spi nor on Hifive Unleashed
 A00 board.

Hi,

> -----Original Message-----
> From: Andreas Schwab <schwab@...ux-m68k.org>
> Sent: Wednesday, May 6, 2020 12:57 PM
> To: Anup Patel <anup@...infault.org>
> Cc: Sagar Kadam <sagar.kadam@...ive.com>; Palmer Dabbelt
> <palmer@...belt.com>; vigneshr@...com; tudor.ambarus@...rochip.com;
> richard@....at; Paul Walmsley <paul.walmsley@...ive.com>; linux-
> kernel@...r.kernel.org; linux-mtd@...ts.infradead.org;
> miquel.raynal@...tlin.com; linux-riscv@...ts.infradead.org
> Subject: Re: [PATCH 1/2] riscv: defconfig: enable spi nor on Hifive Unleashed
> A00 board.
>
> [External Email] Do not click links or attachments unless you recognize the
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>
> On Mai 06 2020, Anup Patel wrote:
>

Thanks for suggestions Anup and Andreas.
I missed to reply, sorry for that.

> > We had build issues in past by selecting major driver subsystems
> > in Kconfig.socs
> >

Please let me know if I am wrong, are you stating about the build issues, fixed in
commit bd6f20333c67 ("RISC-V: Only select essential drivers for SOC_VIRT config")
which was due to all platform dependent and independent driver's enabled in Kconfig.soc
for virtual platform.
Kconfig.socs as meant for platform drivers we can guard SPI_SIFIVE with a guard "if SPI"
so that come across " WARNING: unmet direct dependencies detected for SPI_SIFIVE"
--- a/arch/riscv/Kconfig.socs
+++ b/arch/riscv/Kconfig.socs
@@ -7,6 +7,7 @@ config SOC_SIFIVE
        select CLK_SIFIVE
        select CLK_SIFIVE_FU540_PRCI
        select SIFIVE_PLIC
+       imply SPI_SIFIVE if SPI
        help
          This enables support for SiFive SoC platform hardware.

> > I suggest to select SPI_SIFIVE from Kconfig.socs
>
> SPI_SIFIVE can be m, don't override that.
>
> Andreas.
>
Currently SPI and SPI_SIFIVE are default enabled via defconfig.
In Kconfig.socs if we force the config  option using "select" SPI_SIFIVE will lose its configurable option.
So I was thinking of using the weak dependency using "imply" as above, so that SPI_SIFIVE can
still be modular if required i.e 'm'.
We can then have other platform independent driver's ( SPI, MTD and MTD_SPI_NOR) required for
enabling SPI_NOR flash into the defconfig.
This way we can have SPI_SIFIVE in Kconfig.soc's and SPI_SIFIVE will also be modular
Please let me know your views on this, or if I am missing something.

Thanks & BR,
Sagar Kadam

> --
> Andreas Schwab, schwab@...ux-m68k.org
> GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA
> AEC1
> "And now for something completely different."