linux-kernel - Re: [RFT PATCH 2/9] usb: typec: tipd: Prepare supporting different variants

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Date:   Tue, 21 Sep 2021 16:10:16 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guido Günther <agx@...xcpu.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hector Martin <marcan@...can.st>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>,
        Stan Skowronek <stan@...ellium.com>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Alexander Graf <graf@...zon.com>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>
Subject: Re: [RFT PATCH 2/9] usb: typec: tipd: Prepare supporting different
 variants

Hi,

On Sat, Sep 18, 2021 at 02:09:27PM +0200, Sven Peter wrote:
> Apple M1 machines come with a variant of the TI TPS6598x and will need
> some changes to the current logic. Let's prepare for that by setting up
> the infrastructure required to support different variants of this chip
> identified by the DT compatible.

I think in this case it would make sense to just squash this into the
next patch.

> Signed-off-by: Sven Peter <sven@...npeter.dev>
> ---
>  drivers/usb/typec/tipd/core.c | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index 21b3ae25c76d..656020e7f533 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -9,6 +9,7 @@
>  #include <linux/i2c.h>
>  #include <linux/acpi.h>
>  #include <linux/module.h>
> +#include <linux/of_device.h>
>  #include <linux/power_supply.h>
>  #include <linux/regmap.h>
>  #include <linux/interrupt.h>
> @@ -76,6 +77,10 @@ static const char *const modes[] = {
>  /* Unrecognized commands will be replaced with "!CMD" */
>  #define INVALID_CMD(_cmd_)		(_cmd_ == 0x444d4321)
>  
> +struct tps6598x_hw {
> +};

Black line here.

> +static const struct tps6598x_hw ti_tps6598x_data;
> +
>  struct tps6598x {
>  	struct device *dev;
>  	struct regmap *regmap;
> @@ -91,6 +96,8 @@ struct tps6598x {
>  	struct power_supply *psy;
>  	struct power_supply_desc psy_desc;
>  	enum power_supply_usb_type usb_type;
> +
> +	const struct tps6598x_hw *hw;
>  };
>  
>  static enum power_supply_property tps6598x_psy_props[] = {
> @@ -590,6 +597,13 @@ static int tps6598x_probe(struct i2c_client *client)
>  	if (!tps)
>  		return -ENOMEM;
>  
> +	if (client->dev.of_node)
> +		tps->hw = of_device_get_match_data(&client->dev);
> +	else
> +		tps->hw = &ti_tps6598x_data;
> +	if (!tps->hw)
> +		return -EINVAL;

	tps->hw = of_device_get_match_data(&client->dev);
        if (!tps->hw)
		tps->hw = &ti_tps6598x_data;

>  	mutex_init(&tps->lock);
>  	tps->dev = &client->dev;
>  
> @@ -729,8 +743,11 @@ static int tps6598x_remove(struct i2c_client *client)
>  	return 0;
>  }
>  
> +static const struct tps6598x_hw ti_tps6598x_data = {
> +};

You could also move that above tps6598x_probe() and get rid of the
forward declaration.

>  static const struct of_device_id tps6598x_of_match[] = {
> -	{ .compatible = "ti,tps6598x", },
> +	{ .compatible = "ti,tps6598x", .data = &ti_tps6598x_data },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, tps6598x_of_match);

thanks,

-- 
heikki