linux-kernel - Re: Adding a .platform_init callback to sdhci_arasan

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Message-ID: <2a949ade-edd7-4690-cd6a-434ae1e663dc@intel.com>
Date:   Mon, 28 Nov 2016 12:30:37 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Michal Simek <michal.simek@...inx.com>,
        Sebastian Frias <sf84@...oste.net>,
        Douglas Anderson <dianders@...omium.org>,
        Sören Brinkmann <soren.brinkmann@...inx.com>,
        Jerry Huang <Chang-Ming.Huang@...escale.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mason <slash.tmp@...e.fr>, P L Sai Krishna <lakshmis@...inx.com>
Subject: Re: Adding a .platform_init callback to sdhci_arasan_ops

On 28/11/16 09:32, Michal Simek wrote:
> +Sai for Xilinx perspective.
> 
> On 25.11.2016 16:24, Sebastian Frias wrote:
>> Hi,
>>
>> When using the Arasan SDHCI HW IP, there is a set of parameters called
>> "Hardware initialized registers"
>>
>> (Table 7, Section "Pin Signals", page 56 of Arasan "SD3.0/SDIO3.0/eMMC4.4
>> AHB Host Controller", revision 6.0 document)
>>
>> In some platforms those signals are connected to registers that need to
>> be programmed at some point for proper driver/HW initialisation.
>>
>> I found that the 'struct sdhci_ops' contains a '.platform_init' callback
>> that is called from within 'sdhci_pltfm_init', and that seems a good
>> candidate for a place to program those registers (*).
>>
>> Do you agree?

We already killed .platform_init

What is wrong with sdhci_arasan_probe()?

>>
>> Best regards,
>>
>> Sebastian
>>
>>
>> (*): This has been prototyped on 4.7 as working properly.
>> However, upstream commit:
>>
>> commit 3ea4666e8d429223fbb39c1dccee7599ef7657d5
>> Author: Douglas Anderson <dianders@...omium.org>
>> Date:   Mon Jun 20 10:56:47 2016 -0700
>>
>>     mmc: sdhci-of-arasan: Properly set corecfg_baseclkfreq on rk3399
>> ...
>>
>> could affect this solution because of the way the 'sdhci_arasan_of_match'
>> struct is used after that commit.
>>
> 
>