linux-kernel - Re: [PATCH RESEND v8 2/2] mtd: rawnand: meson: add support for Amlogic NAND flash controller

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Message-ID: <CAFBinCAeDtu-KTy=4bmAtBY9hGK8rRo=OW70tgEOyRBnQcdz1g@mail.gmail.com>
Date:   Sat, 22 Dec 2018 18:07:12 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Jianxin Pan <jianxin.pan@...ogic.com>
Cc:     Boris Brezillon <boris.brezillon@...tlin.com>,
        linux-mtd@...ts.infradead.org, Liang Yang <liang.yang@...ogic.com>,
        Yixun Lan <yixun.lan@...ogic.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Jerome Brunet <jbrunet@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        Kevin Hilman <khilman@...libre.com>,
        Rob Herring <robh@...nel.org>, Jian Hu <jian.hu@...ogic.com>,
        Hanjie Lin <hanjie.lin@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>,
        linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v8 2/2] mtd: rawnand: meson: add support for
 Amlogic NAND flash controller

Hi Jianxin, Hi Liang,

On Fri, Dec 21, 2018 at 12:45 PM Jianxin Pan <jianxin.pan@...ogic.com> wrote:
>
> From: Liang Yang <liang.yang@...ogic.com>
>
> Add initial support for the Amlogic NAND flash controller which found
> in the Meson-GXBB/GXL/AXG SoCs.
>
> Signed-off-by: Liang Yang <liang.yang@...ogic.com>
> Signed-off-by: Yixun Lan <yixun.lan@...ogic.com>
> Signed-off-by: Jianxin Pan <jianxin.pan@...ogic.com>
> ---
>  drivers/mtd/nand/raw/Kconfig      |   10 +
>  drivers/mtd/nand/raw/Makefile     |    1 +
>  drivers/mtd/nand/raw/meson_nand.c | 1468 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 1479 insertions(+)
>  create mode 100644 drivers/mtd/nand/raw/meson_nand.c
>
> diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
> index 1a55d3e..d05ff20 100644
> --- a/drivers/mtd/nand/raw/Kconfig
> +++ b/drivers/mtd/nand/raw/Kconfig
> @@ -541,4 +541,14 @@ config MTD_NAND_TEGRA
>           is supported. Extra OOB bytes when using HW ECC are currently
>           not supported.
>
> +config MTD_NAND_MESON
> +       tristate "Support for NAND controller on Amlogic's Meson SoCs"
> +       depends on ARCH_MESON || COMPILE_TEST
> +       depends on COMMON_CLK_AMLOGIC
> +       select COMMON_CLK_REGMAP_MESON
I believe that "depends on COMMON_CLK_AMLOGIC" and "select
COMMON_CLK_REGMAP_MESON" are not necessary:
the driver should build fine without them because it's only
interfacing with the common clock framework.
the common clock framework is enabled by ARCH_MESON and for the
COMPILE_TEST case the common clock framework provides stub
implementations inside the headers.

> +       select MFD_SYSCON
> +       help
> +         Enables support for NAND controller on Amlogic's Meson SoCs.
> +         This controller is found on Meson GXBB, GXL, AXG SoCs.
you are explicitly mentioning GXBB here but you don't add a "GXBB" compatible.
I suggest to shorten this sentence ("This controller is found on Meson
SoCs.") because this driver can also support the 32-bit
Meson8/Meson8b/Meson8m2 SoCs with minor adjustments.


Regards
Martin