linux-kernel - Re: [PATCH v2 19/22] mmc: tmio: ioremap memory resource in tmio_mmc_host

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Date:   Tue, 16 Jan 2018 10:44:22 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-mmc@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Simon Horman <simon.horman@...ronome.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v2 19/22] mmc: tmio: ioremap memory resource in
 tmio_mmc_host_alloc()

On Sat, Nov 25, 2017 at 01:24:54AM +0900, Masahiro Yamada wrote:
> The register region is ioremap'ed in the tmio_mmc_host_probe(), i.e.
> drivers cannot get access to the hardware before mmc_add_host().
> 
> Actually, renesas_sdhi_core.c reads out the CTL_VERSION register to
> complete the platform-specific settings.  However, at this point,
> the MMC host is already running.
> 
> Move the register ioremap to tmio_mmc_host_alloc() so that drivers
> can perform platform-specific settings between tmio_mmc_host_alloc()
> and tmio_mmc_host_probe().
> 
> I changed tmio_mmc_host_alloc() to return an error pointer to
> propagate the return code from devm_ioremap_resource().
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---

Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>


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