linux-kernel - Re: [PATCH v7 2/5] i3c: master: svc: Add support for Nuvoton npcm845 i3c

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Message-ID: <Z8m6Y8WTevsCUMZX@lizhi-Precision-Tower-5810>
Date: Thu, 6 Mar 2025 10:08:19 -0500
From: Frank Li <Frank.li@....com>
To: Stanley Chu <stanley.chuys@...il.com>
Cc: miquel.raynal@...tlin.com, alexandre.belloni@...tlin.com,
	robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, tomer.maimon@...oton.com,
	kwliu@...oton.com, yschu@...oton.com
Subject: Re: [PATCH v7 2/5] i3c: master: svc: Add support for Nuvoton npcm845
 i3c

On Thu, Mar 06, 2025 at 03:54:26PM +0800, Stanley Chu wrote:
> From: Stanley Chu <yschu@...oton.com>
>
> Nuvoton npcm845 SoC uses an older IP version, which has specific
> hardware issues that need to be addressed with a different compatible
> string.
>
> Add driver data for different compatible strings to define platform
> specific quirks.
> Add compatible string for npcm845 to define its own driver data.
>
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202503061400.GGr64rkR-lkp@intel.com/

Needn't these for new version. Need such tags only when seperated patch
that fix this issue.

I think alex can drop these when apply. If need respin patches, remove it.

Reviewed-by: Frank Li <Frank.Li@....com>

> Signed-off-by: Stanley Chu <yschu@...oton.com>
> ---
>  drivers/i3c/master/svc-i3c-master.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
> index d6057d8c7dec..40269b692aa8 100644
> --- a/drivers/i3c/master/svc-i3c-master.c
> +++ b/drivers/i3c/master/svc-i3c-master.c
> @@ -158,6 +158,10 @@ struct svc_i3c_regs_save {
>  	u32 mdynaddr;
>  };
>
> +struct svc_i3c_drvdata {
> +	u32 quirks;
> +};
> +
>  /**
>   * struct svc_i3c_master - Silvaco I3C Master structure
>   * @base: I3C master controller
> @@ -183,6 +187,7 @@ struct svc_i3c_regs_save {
>   * @ibi.tbq_slot: To be queued IBI slot
>   * @ibi.lock: IBI lock
>   * @lock: Transfer lock, protect between IBI work thread and callbacks from master
> + * @drvdata: Driver data
>   * @enabled_events: Bit masks for enable events (IBI, HotJoin).
>   * @mctrl_config: Configuration value in SVC_I3C_MCTRL for setting speed back.
>   */
> @@ -214,6 +219,7 @@ struct svc_i3c_master {
>  		spinlock_t lock;
>  	} ibi;
>  	struct mutex lock;
> +	const struct svc_i3c_drvdata *drvdata;
>  	u32 enabled_events;
>  	u32 mctrl_config;
>  };
> @@ -1817,6 +1823,10 @@ static int svc_i3c_master_probe(struct platform_device *pdev)
>  	if (!master)
>  		return -ENOMEM;
>
> +	master->drvdata = of_device_get_match_data(dev);
> +	if (!master->drvdata)
> +		return -EINVAL;
> +
>  	master->regs = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(master->regs))
>  		return PTR_ERR(master->regs);
> @@ -1958,8 +1968,13 @@ static const struct dev_pm_ops svc_i3c_pm_ops = {
>  			   svc_i3c_runtime_resume, NULL)
>  };
>
> +static const struct svc_i3c_drvdata npcm845_drvdata = {};
> +
> +static const struct svc_i3c_drvdata svc_default_drvdata = {};
> +
>  static const struct of_device_id svc_i3c_master_of_match_tbl[] = {
> -	{ .compatible = "silvaco,i3c-master-v1"},
> +	{ .compatible = "nuvoton,npcm845-i3c", .data = &npcm845_drvdata },
> +	{ .compatible = "silvaco,i3c-master-v1", .data = &svc_default_drvdata },
>  	{ /* sentinel */ },
>  };
>  MODULE_DEVICE_TABLE(of, svc_i3c_master_of_match_tbl);
> --
> 2.34.1
>
>
> --
> linux-i3c mailing list
> linux-i3c@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-i3c

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