linux-kernel - RE: [PATCH v6] mmc: Export host capabilities to debugfs.

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Date:   Wed, 7 Mar 2018 06:40:44 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Harish Jenny K N <harish_kandiga@...tor.com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "shawn.lin@...k-chips.com" <shawn.lin@...k-chips.com>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>
CC:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Vladimir_Zapolskiy@...tor.com" <Vladimir_Zapolskiy@...tor.com>
Subject: RE: [PATCH v6] mmc: Export host capabilities to debugfs.



> -----Original Message-----
> From: Harish Jenny K N [mailto:harish_kandiga@...tor.com]
> Sent: Wednesday, March 07, 2018 7:38 AM
> To: ulf.hansson@...aro.org; linus.walleij@...aro.org;
> adrian.hunter@...el.com; shawn.lin@...k-chips.com; Avri Altman
> <Avri.Altman@....com>; andriy.shevchenko@...ux.intel.com
> Cc: linux-mmc@...r.kernel.org; linux-kernel@...r.kernel.org;
> harish_kandiga@...tor.com; Vladimir_Zapolskiy@...tor.com
> Subject: [PATCH v6] mmc: Export host capabilities to debugfs.
> 
> This patch exports the host capabilities to debugfs
> 
> This idea of sharing host capabilities over debugfs came up from Abbas Raza
> <Abbas_Raza@...tor.com> Earlier discussions:
> https://lkml.org/lkml/2018/3/5/357
> https://www.spinics.net/lists/linux-mmc/msg48219.html
> 
> Signed-off-by: Harish Jenny K N <harish_kandiga@...tor.com>
> ---
> 
> 
> +static int mmc_caps_show(struct seq_file *s, void *unused) {
> +	struct mmc_host *host = s->private;
> +	u32 caps = host->caps;
> +
> +	seq_puts(s, "\nMMC Host capabilities are:\n");
> +	seq_puts(s,
> "=============================================\n");
> +	seq_printf(s, "Can the host do 4 bit transfers :\t%s\n",
> +		   ((caps & MMC_CAP_4_BIT_DATA) ? "Yes" : "No"));

Maybe use a more compact form, and just call a macro with the applicable (stringified) bit?


Thanks,
Avri