linux-kernel - Re: [PATCH 06/14] mmc: dw_mmc: simplify optional reset handling

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Date:   Tue, 31 Jan 2017 12:52:07 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>,
        Guodong Xu <guodong.xu@...aro.org>
Subject: Re: [PATCH 06/14] mmc: dw_mmc: simplify optional reset handling

On 30 January 2017 at 12:41, Philipp Zabel <p.zabel@...gutronix.de> wrote:
> As of commit bb475230b8e5 ("reset: make optional functions really
> optional"), the reset framework API calls use NULL pointers to describe
> optional, non-present reset controls.
>
> This allows to return errors from devm_reset_control_get_optional and to
> call reset_control_(de)assert unconditionally.
>
> Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
> Cc: Guodong Xu <guodong.xu@...aro.org>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>

Philipp, I have looked at patch 6,7,8 in this series - they look good to me.

However, could you please re-post to linux-mmc and make sure to
include the proper driver maintainers for each change. For example,
Jaehoon Chung maintains dw_mmc.

Moreover, I assume you want me to pick the mmc changes or is there is
dependency to another tree here?

Kind regards
Uffe

> ---
>  drivers/mmc/host/dw_mmc.c | 14 +++++---------
>  1 file changed, 5 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index b44306b886cb6..9039e8f81ff12 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -2963,10 +2963,8 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
>
>         /* find reset controller when exist */
>         pdata->rstc = devm_reset_control_get_optional(dev, "reset");
> -       if (IS_ERR(pdata->rstc)) {
> -               if (PTR_ERR(pdata->rstc) == -EPROBE_DEFER)
> -                       return ERR_PTR(-EPROBE_DEFER);
> -       }
> +       if (IS_ERR(pdata->rstc))
> +               return ERR_CAST(pdata->rstc);
>
>         /* find out number of slots supported */
>         of_property_read_u32(np, "num-slots", &pdata->num_slots);
> @@ -3090,7 +3088,7 @@ int dw_mci_probe(struct dw_mci *host)
>                 }
>         }
>
> -       if (!IS_ERR(host->pdata->rstc)) {
> +       if (host->pdata->rstc) {
>                 reset_control_assert(host->pdata->rstc);
>                 usleep_range(10, 50);
>                 reset_control_deassert(host->pdata->rstc);
> @@ -3245,8 +3243,7 @@ int dw_mci_probe(struct dw_mci *host)
>         if (host->use_dma && host->dma_ops->exit)
>                 host->dma_ops->exit(host);
>
> -       if (!IS_ERR(host->pdata->rstc))
> -               reset_control_assert(host->pdata->rstc);
> +       reset_control_assert(host->pdata->rstc);
>
>  err_clk_ciu:
>         clk_disable_unprepare(host->ciu_clk);
> @@ -3278,8 +3275,7 @@ void dw_mci_remove(struct dw_mci *host)
>         if (host->use_dma && host->dma_ops->exit)
>                 host->dma_ops->exit(host);
>
> -       if (!IS_ERR(host->pdata->rstc))
> -               reset_control_assert(host->pdata->rstc);
> +       reset_control_assert(host->pdata->rstc);
>
>         clk_disable_unprepare(host->ciu_clk);
>         clk_disable_unprepare(host->biu_clk);
> --
> 2.11.0
>