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Subject: Re: [PATCH v9 2/3] spi: Add Renesas R-Car Gen3 RPC-IF SPI controller
 driver
From:   Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To:     Mason Yang <masonccyang@mxic.com.tw>, broonie@kernel.org,
        marek.vasut@gmail.com, linux-kernel@vger.kernel.org,
        linux-spi@vger.kernel.org, bbrezillon@kernel.org,
        linux-renesas-soc@vger.kernel.org,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        devicetree@vger.kernel.org, mark.rutland@arm.com,
        robh+dt@kernel.org, lee.jones@linaro.org
Cc:     juliensu@mxic.com.tw, Simon Horman <horms@verge.net.au>,
        zhengxunli@mxic.com.tw
References: <1553847606-18122-1-git-send-email-masonccyang@mxic.com.tw>
 <1553847606-18122-3-git-send-email-masonccyang@mxic.com.tw>
 <1e2bf23d-db39-0d1d-0bcc-6d9cd2935a82@cogentembedded.com>
Organization: Cogent Embedded
Message-ID: <cdee3d53-6ee3-4435-117e-8ba4a58ca72b@cogentembedded.com>
Date:   Sat, 13 Apr 2019 19:39:45 +0300
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On 04/13/2019 07:38 PM, Sergei Shtylyov wrote:

>> Add a driver for Renesas R-Car Gen3 RPC-IF SPI controller.
>>
>> Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
>> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
> [...]
>> diff --git a/drivers/spi/spi-renesas-rpc.c b/drivers/spi/spi-renesas-rpc.c
>> new file mode 100644
>> index 0000000..037f273
>> --- /dev/null
>> +++ b/drivers/spi/spi-renesas-rpc.c
> [...]
>> +static int rpc_spi_probe(struct platform_device *pdev)
>> +{
>> +	struct spi_controller *ctlr;
>> +	struct rpc_mfd *rpc_mfd = dev_get_drvdata(pdev->dev.parent);
>> +	struct rpc_spi *rpc;
>> +	int ret;
>> +
>> +	ctlr = spi_alloc_master(&pdev->dev, sizeof(*rpc));
>> +	if (!ctlr)
>> +		return -ENOMEM;
>> +
>> +	platform_set_drvdata(pdev, ctlr);
>> +
>> +	rpc = spi_controller_get_devdata(ctlr);
>> +
>> +	ctlr->dev.of_node = pdev->dev.of_node;
> [...]
>> +
>> +	pm_runtime_enable(&pdev->dev);
>> +	ctlr->auto_runtime_pm = true;
> 
>    I think this line no longer works as expected with the new probing scheme.
> Have you tested reading? v8 patch still works while v9 patches hang on doing:
> 
> $ cat /dev/mtd<n>...

   Sorry, 'od -x', not 'cat'.

WBR, Sergei