linux-kernel - Re: [PATCH 0/2] Enable GPIO and I2C configs for TI's J721e platform

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Date:   Thu, 8 Oct 2020 12:19:06 +0300
From:   Tero Kristo <t-kristo@...com>
To:     Faiz Abbas <faiz_abbas@...com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <will@...nel.org>, <catalin.marinas@....com>, <nm@...com>
Subject: Re: [PATCH 0/2] Enable GPIO and I2C configs for TI's J721e platform

On 08/10/2020 11:59, Faiz Abbas wrote:
> Tero,
> 
> On 06/10/20 6:40 pm, Tero Kristo wrote:
>> On 06/10/2020 16:03, Faiz Abbas wrote:
>>> Hi Tero,
>>>
>>> On 06/10/20 5:21 pm, Tero Kristo wrote:
>>>> On 02/10/2020 19:45, Faiz Abbas wrote:
>>>>> The following patches enable configs in the arm64 defconfig to support
>>>>> GPIO and I2C support on TI's J721e platform.
>>>>>
>>>>> Faiz Abbas (2):
>>>>>      arm64: defconfig: Enable OMAP I2C driver
>>>>>      arm64: defconfig: Enable DAVINCI_GPIO driver
>>>>>
>>>>>     arch/arm64/configs/defconfig | 2 ++
>>>>>     1 file changed, 2 insertions(+)
>>>>>
>>>>
>>>> Why are you enabling these?
>>>>
>>>> Are they required for booting the board?
>>>>
>>>> If not, they shall not be enabled, as it just clutters the arm64 defconfig unnecessarily.
>>>>
>>>
>>> They are required because the SD card regulators need gpio over i2c expander and also
>>> soc gpio support to come up in UHS modes.
>>
>> Is that needed for boot support? If it is only needed with UHS cards, that does not seem important enough for me. We can already boot the board via other means.
> 
> Without these configs, the regulator drivers keep EPROBE_DEFERing waiting for their gpio drivers
> to probe and SD card never comes up. This configuration happens before any UHS capabilities are detected.
> 
> [    1.326654] sdhci-am654 4fb0000.sdhci: _devm_regulator_get id:vmmc ret:-517
> [    1.333651] sdhci-am654 4fb0000.sdhci: _devm_regulator_get id:vqmmc ret:-517
> [    1.340693] sdhci-am654 4fb0000.sdhci: sdhci_am654_probe ret:-517
> [    1.489088] sdhci-am654 4fb0000.sdhci: _devm_regulator_get id:vmmc ret:-517
> [    1.496067] sdhci-am654 4fb0000.sdhci: _devm_regulator_get id:vqmmc ret:-517
> [    1.510392] sdhci-am654 4fb0000.sdhci: sdhci_am654_probe ret:-517
> [    1.543210] sdhci-am654 4fb0000.sdhci: _devm_regulator_get id:vmmc ret:-517
> [    1.550186] sdhci-am654 4fb0000.sdhci: _devm_regulator_get id:vqmmc ret:-517
> [    1.568134] sdhci-am654 4fb0000.sdhci: sdhci_am654_probe ret:-517

This happens because you have merged/enabled UHS support or? This sounds 
like a regression as I haven't seen this happen before.

-Tero
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