linux-kernel - Re: [PATCH 2/2] mmc: core: Use device_property_read instead of of_property

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Message-ID: <CAPDyKFq-LSBr79ej06p2F_GcJeOMnuuJvOO0XgjaGCHoU1RpUQ@mail.gmail.com>
Date:   Fri, 19 May 2017 10:23:54 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     David Woods <dwoods@...lanox.com>
Cc:     Jaehoon Chung <jh80.chung@...sung.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>, cmetcalf@...lanox.com,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        stable@...r.linux.org
Subject: Re: [PATCH 2/2] mmc: core: Use device_property_read instead of of_property_read

On 18 May 2017 at 00:17, David Woods <dwoods@...lanox.com> wrote:
> Using the device_property interfaces allows mmc drivers to work
> on platforms which run on either device tree or ACPI.
>
> Signed-off-by: David Woods <dwoods@...lanox.com>
> Reviewed-by: Chris Metcalf <cmetcalf@...lanox.com>
> Cc: stable@...r.linux.org
> ---
>  drivers/mmc/core/host.c | 72 ++++++++++++++++++++++++-------------------------
>  1 file changed, 35 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
> index 3f8c85d..d2c059e 100644
> --- a/drivers/mmc/core/host.c
> +++ b/drivers/mmc/core/host.c
> @@ -176,19 +176,17 @@ static void mmc_retune_timer(unsigned long data)
>   */
>  int mmc_of_parse(struct mmc_host *host)
>  {
> -       struct device_node *np;
> +       struct device *dev = host->parent;
>         u32 bus_width;
>         int ret;
>         bool cd_cap_invert, cd_gpio_invert = false;
>         bool ro_cap_invert, ro_gpio_invert = false;
>
> -       if (!host->parent || !host->parent->of_node)
> +       if (!dev)
>                 return 0;
>

So earlier we stopped executing the OF parsing at this point, unless
we had valid a of_node pointer. To be safe, I think we need to do
something similar here.

In other words, perhaps check the result from dev_fwnode(), before continue.

[...]

mmc_pwrseq_alloc() is called from mmc_of_parse() which currently only
supports OF parsing. I assume you would like to convert that as well?
Perhaps that should even be the first step?

Kind regards
Uffe