linux-kernel - Re: [PATCH v2 3/5] spi: spi-altera-dfl: support n5010 feature revision

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Message-ID: <YNoJSxnm4g1vufbB@epycbox.lan>
Date:   Mon, 28 Jun 2021 10:39:23 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     Martin Hundebøll <martin@...nix.com>
Cc:     Wu Hao <hao.wu@...el.com>, Tom Rix <trix@...hat.com>,
        Moritz Fischer <mdf@...nel.org>, Xu Yilun <yilun.xu@...el.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Martin Hundebøll <mhu@...icom.dk>,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-spi@...r.kernel.org
Subject: Re: [PATCH v2 3/5] spi: spi-altera-dfl: support n5010 feature
 revision

On Fri, Jun 25, 2021 at 09:42:11AM +0200, Martin Hundebøll wrote:
> From: Martin Hundebøll <mhu@...icom.dk>
> 
> The Max10 BMC on the Silicom n5010 PAC is slightly different than the
> existing BMC's, so use a dedicated feature revision detect it.
> 
> Signed-off-by: Martin Hundebøll <mhu@...icom.dk>
> ---
> 
> Changes since v1:
>  * use feature revision from struct dfl_device instead of reading it
>    from io-mem
> 
>  drivers/spi/spi-altera-dfl.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/spi/spi-altera-dfl.c b/drivers/spi/spi-altera-dfl.c
> index 3e32e4fe5895..f6cf7c8d9dac 100644
> --- a/drivers/spi/spi-altera-dfl.c
> +++ b/drivers/spi/spi-altera-dfl.c
> @@ -111,6 +111,13 @@ static struct spi_board_info m10_bmc_info = {
>  	.chip_select = 0,
>  };
>  
> +static struct spi_board_info m10_n5010_bmc_info = {
> +	.modalias = "m10-n5010",
> +	.max_speed_hz = 12500000,
> +	.bus_num = 0,
> +	.chip_select = 0,
> +};
Is there no way to query the mc for version info?
> +
>  static void config_spi_master(void __iomem *base, struct spi_master *master)
>  {
>  	u64 v;
> @@ -130,6 +137,7 @@ static void config_spi_master(void __iomem *base, struct spi_master *master)
>  
>  static int dfl_spi_altera_probe(struct dfl_device *dfl_dev)
>  {
> +	struct spi_board_info *board_info = &m10_bmc_info;
>  	struct device *dev = &dfl_dev->dev;
>  	struct spi_master *master;
>  	struct altera_spi *hw;
> @@ -172,9 +180,12 @@ static int dfl_spi_altera_probe(struct dfl_device *dfl_dev)
>  		goto exit;
>  	}
>  
> -	if (!spi_new_device(master,  &m10_bmc_info)) {
> +	if (dfl_dev->revision == FME_FEATURE_REV_MAX10_SPI_N5010)
> +		board_info = &m10_n5010_bmc_info;

Since this depends on the previous patch: Mark do you want to take both
patches once they're reviewed? From what I can tell the BMC and HWMON
don't directly depend on it, so taking them through SPI tree might be
easiest.

Alternatively I can provide a tag for the DFL change for you to pull.

> +
> +	if (!spi_new_device(master, board_info)) {
>  		dev_err(dev, "%s failed to create SPI device: %s\n",
> -			__func__, m10_bmc_info.modalias);
> +			__func__, board_info->modalias);
>  	}
>  
>  	return 0;
> -- 
> 2.31.0
> 

- Moritz