linux-kernel - Re: [PATCH v3 1/2] spi: Add Renesas R-Car Gen3 RPC SPI controller driver

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Date:   Tue, 11 Dec 2018 22:45:29 +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, boris.brezillon@...tlin.com,
        linux-renesas-soc@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     juliensu@...c.com.tw, Simon Horman <horms@...ge.net.au>,
        zhengxunli@...c.com.tw
Subject: Re: [PATCH v3 1/2] spi: Add Renesas R-Car Gen3 RPC SPI controller
 driver

On 12/07/2018 02:13 PM, Mason Yang wrote:

> Add a driver for Renesas R-Car Gen3 RPC SPI controller.
> 
> Signed-off-by: Mason Yang <masonccyang@...c.com.tw>
[...]
> diff --git a/drivers/spi/spi-renesas-rpc.c b/drivers/spi/spi-renesas-rpc.c
> new file mode 100644
> index 0000000..cec5669
> --- /dev/null
> +++ b/drivers/spi/spi-renesas-rpc.c
> @@ -0,0 +1,776 @@
[...]
> +static const struct soc_device_attribute r8a7795es1[] __initconst = {

   This __initconst shouldn't be there, it causes a build warning.

> +	{ .soc_id = "r8a7795", .revision = "ES1.*" },

   Wait, the driver doesn't really probe on R8A7795 yet!

> +	{ /* sentinel */ }
> +};
> +
> +static void rpc_spi_hw_init(struct rpc_spi *rpc)
> +{
> +	int strtim;
> +	/*
> +	 * NOTE: The 0x260 are undocumented bits, but they must be set.
> +	 *	RPC_PHYCNT_STRTIM is strobe timing adjustment bit,
> +	 *	0x0 : the delay is biggest,
> +	 *	0x1 : the delay is 2nd biggest,
> +	 *	On H3 ES1.x, the value should be 0, while on others,
> +	 *	the value should be 6.
> +	 */
> +	if (soc_device_match(r8a7795es1))
> +		strtim = 0;
> +	else
> +		strtim = 6;
[...]
> +static const struct of_device_id rpc_spi_of_ids[] = {
> +	{ .compatible = "renesas,r8a77995-rpc", },

   We only support R8A77995 now.

> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, rpc_spi_of_ids);
[...]

MBR, Sergei