linux-kernel - Re: [PATCH v4] soundwire: intel: move to auxiliary bus

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Date:   Wed, 9 Jun 2021 21:02:30 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Vinod Koul <vkoul@...nel.org>, alsa-devel@...a-project.org,
        Leon Romanovsky <leon@...nel.org>,
        linux-kernel@...r.kernel.org,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        hui.wang@...onical.com, Jason Gunthorpe <jgg@...dia.com>,
        Dave Ertman <david.m.ertman@...el.com>,
        sanyog.r.kale@...el.com,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        rander.wang@...ux.intel.com, bard.liao@...el.com
Subject: Re: [PATCH v4] soundwire: intel: move to auxiliary bus

On Wed, Jun 09, 2021 at 09:44:08AM -0500, Pierre-Louis Bossart wrote:
> The model is exactly the same as what we have today with the platform
> devices. We did not add ANY new fields or information, what is passed in
> that structure is exactly the same as what we do upstream today with the
> platform devices.
> 
> To make my point, here is the structure in intel.h as of v5.13-rc1
> 
> struct sdw_intel_link_res {
> 	struct platform_device *pdev;
> 	void __iomem *mmio_base; /* not strictly needed, useful for debug */
> 	void __iomem *registers;
> 	void __iomem *shim;
> 	void __iomem *alh;
> 	int irq;
> 	const struct sdw_intel_ops *ops;
> 	struct device *dev;
> 	struct mutex *shim_lock; /* protect shared registers */
> 	u32 *shim_mask;
> 	u32 clock_stop_quirks;
> 	u32 link_mask;
> 	struct sdw_cdns *cdns;
> 	struct list_head list;
> };
> 
> and here's what we suggested in this patch:
> 
> struct sdw_intel_link_res {
> 	void __iomem *mmio_base; /* not strictly needed, useful for debug */
> 	void __iomem *registers;
> 	void __iomem *shim;
> 	void __iomem *alh;
> 	int irq;
> 	const struct sdw_intel_ops *ops;
> 	struct device *dev;
> 	struct mutex *shim_lock; /* protect shared registers */
> 	u32 *shim_mask;
> 	u32 clock_stop_quirks;
> 	u32 link_mask;
> 	struct sdw_cdns *cdns;
> 	struct list_head list;
> };
> 
> You will notice that we removed the platform_device *pdev, but embedded this
> structure into a larger one to make use of container_of()
> 
> struct sdw_intel_link_dev {
> 	struct auxiliary_device auxdev;
> 	struct sdw_intel_link_res link_res;
> };
> 
> That's it. We did not change anything else, all the other fields are
> identical. We are only changing the TYPE of device and the interfaces for
> probe/remove but using the same information and the same device hierarchy.

And this is the correct thing to do, you have done it properly here,
nice work.

greg k-h