linux-kernel - Re: [alsa-devel] [PATCH v7 03/13] slimbus: Add SLIMbus bus type

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Date:   Thu, 16 Nov 2017 18:48:14 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     srinivas.kandagatla@...aro.org
Cc:     gregkh@...uxfoundation.org, broonie@...nel.org,
        alsa-devel@...a-project.org, mark.rutland@....com,
        michael.opdenacker@...e-electrons.com, poeschel@...onage.de,
        andreas.noever@...il.com, arnd@...db.de, bp@...e.de,
        devicetree@...r.kernel.org, james.hogan@...tec.com,
        pawel.moll@....com, linux-arm-msm@...r.kernel.org,
        sharon.dvir1@...l.huji.ac.il, robh+dt@...nel.org,
        sdharia@...eaurora.org, alan@...ux.intel.com, treding@...dia.com,
        mathieu.poirier@...aro.org, jkosina@...e.cz,
        linux-kernel@...r.kernel.org, daniel@...ll.ch, joe@...ches.com,
        davem@...emloft.net
Subject: Re: [alsa-devel] [PATCH v7 03/13] slimbus: Add SLIMbus bus type

On Wed, Nov 15, 2017 at 02:10:33PM +0000, srinivas.kandagatla@...aro.org wrote:

> +menuconfig SLIMBUS
> +	tristate "Slimbus support"
> +	help
> +	  Slimbus is standard interface between System-on-Chip and audio codec,
> +	  and other peripheral components in typical embedded systems.
> +
> +	  If unsure, choose N.
> +
> +if SLIMBUS
> +
> +# SlIMbus controllers

Slimbus perhaps?

> +static int slim_device_match(struct device *dev, struct device_driver *drv)
> +{
> +	struct slim_device *sbdev = to_slim_device(dev);
> +	struct slim_driver *sbdrv = to_slim_driver(drv);
> +
> +	return slim_match(sbdrv->id_table, sbdev) != NULL;

return !!slim_match() ?

> +static int slim_device_probe(struct device *dev)
> +{
> +	struct slim_device	*sbdev;
> +	struct slim_driver	*sbdrv;
> +	int ret = 0;
> +
> +	sbdev = to_slim_device(dev);
> +	sbdrv = to_slim_driver(dev->driver);
> +
> +	if (sbdrv->probe)
> +		ret = sbdrv->probe(sbdev);

shouldn't probe be mandatory :)

> diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> index 1c2e8d6b7274..7d6238863fc1 100644
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.h
> @@ -452,6 +452,19 @@ struct spi_device_id {
>  	kernel_ulong_t driver_data;	/* Data private to the driver */
>  };
>  
> +/* SLIMbus */
> +
> +#define SLIMBUS_NAME_SIZE	32
> +#define SLIMBUS_MODULE_PREFIX	"slim:"
> +
> +struct slim_device_id {
> +	__u16 manf_id, prod_code;
> +	__u8 dev_index, instance;
> +
> +	/* Data private to the driver */
> +	kernel_ulong_t driver_data;

As Takashi pointed out in SDW patches, this needs to be aligned.

> +};
> +

I was hoping to see changes to devicetable-offsets.c and file2alias.c as
well as that is required for module autoloading. I think that is required?

> +/**
> + * struct slim_device - Slim device handle.
> + * @dev: Driver model representation of the device.
> + * @name: Name of driver to use with this device.
> + * @e_addr: Enumeration address of this device.
> + * @driver: Device's driver. Pointer to access routines.
> + * @laddr: 1-byte Logical address of this device.
> + *
> + * This is the client/device handle returned when a slimbus
> + * device is registered with a controller.
> + * Pointer to this structure is used by client-driver as a handle.
> + */
> +struct slim_device {
> +	struct device		dev;
> +	struct slim_eaddr	e_addr;
> +	struct list_head node;

aligned with others please

> +/**
> + * struct slim_driver - Slimbus 'generic device' (slave) device driver
> + *				(similar to 'spi_device' on SPI)
> + * @probe: Binds this driver to a slimbus device.
> + * @remove: Unbinds this driver from the slimbus device.
> + * @shutdown: Standard shutdown callback used during powerdown/halt.
> + * @device_status: This callback is called when
> + *	-The device reports present and gets a laddr assigned
> + *	-The device reports absent, or the bus goes down.

space after - pls

-- 
~Vinod