linux-kernel - Re: [PATCH v9 2/3] spi: Add Renesas R-Car Gen3 RPC-IF SPI controller driver

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Date:   Sat, 13 Apr 2019 19:38:31 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Mason Yang <masonccyang@...c.com.tw>, broonie@...nel.org,
        marek.vasut@...il.com, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org, bbrezillon@...nel.org,
        linux-renesas-soc@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        devicetree@...r.kernel.org, mark.rutland@....com,
        robh+dt@...nel.org, lee.jones@...aro.org
Cc:     juliensu@...c.com.tw, Simon Horman <horms@...ge.net.au>,
        zhengxunli@...c.com.tw
Subject: Re: [PATCH v9 2/3] spi: Add Renesas R-Car Gen3 RPC-IF SPI controller
 driver

Hello!

On 03/29/2019 11:20 AM, Mason Yang wrote:

> Add a driver for Renesas R-Car Gen3 RPC-IF SPI controller.
> 
> Signed-off-by: Mason Yang <masonccyang@...c.com.tw>
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.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>...

[...]