linux-kernel - Re: [PATCH v3 12/16] mmc: tmio: support IP-builtin card detection logic

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Date:   Wed, 7 Feb 2018 20:34:59 +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>,
        Ulf Magnusson <ulfalizer@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Simon Horman <horms+renesas@...ge.net.au>,
        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 v3 12/16] mmc: tmio: support IP-builtin card detection
 logic

On Thu, Jan 18, 2018 at 01:28:12AM +0900, Masahiro Yamada wrote:
> A card detect GPIO is set up only for platforms with "cd-gpios"
> DT property or TMIO_MMC_USE_GPIO_CD flag.  However, the driver
> core always uses mmc_gpio_get_cd, which just fails with -ENOSYS
> if ctx->cd_gpio is unset.
> 
> The bit 5 of the status register provides the current signal level
> of the CD line.  Allow to use it if the GPIO is unused.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

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

> @@ -1095,7 +1103,7 @@ static const struct mmc_host_ops tmio_mmc_ops = {

I just wonder why the diff-tool puts 'const' in the definition. There is
no const in my version here. And there shouldn't be because we modify
the struct in this patch.


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