linux-kernel - Re: [PATCH 09/18] staging: typec: fusb302: Use tcpm_set_current_limit

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Date:   Sun, 6 Aug 2017 07:24:31 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Hans de Goede <hdegoede@...hat.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Sebastian Reichel <sre@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, Liam Breck <liam@...workimprov.net>,
        Tony Lindgren <tony@...mide.com>, linux-pm@...r.kernel.org,
        devel@...verdev.osuosl.org
Subject: Re: [PATCH 09/18] staging: typec: fusb302: Use
 tcpm_set_current_limit_psy

On 08/06/2017 05:35 AM, Hans de Goede wrote:
> Register a power_supply and use tcpm_set_current_limit_psy as
> set_current_limit so that another driver (e.g. the charger driver) can
> pick the limit up and configure the system accordingly.
> 
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---
>   drivers/staging/typec/fusb302/fusb302.c | 18 ++++++------------
>   1 file changed, 6 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/staging/typec/fusb302/fusb302.c b/drivers/staging/typec/fusb302/fusb302.c
> index 1d8c9b66df2f..e1e08f57af99 100644
> --- a/drivers/staging/typec/fusb302/fusb302.c
> +++ b/drivers/staging/typec/fusb302/fusb302.c
> @@ -854,17 +854,6 @@ static int tcpm_set_vbus(struct tcpc_dev *dev, bool on, bool charge)
>   	return ret;
>   }
>   
> -static int tcpm_set_current_limit(struct tcpc_dev *dev, u32 max_ma, u32 mv)
> -{
> -	struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
> -						 tcpc_dev);
> -
> -	fusb302_log(chip, "current limit: %d ma, %d mv (not implemented)",
> -		    max_ma, mv);
> -
> -	return 0;
> -}
> -

Same comment as before. I think the fusb code should do what tcpm_set_current_limit_psy
is doing, ie register with a power supply.

>   static int fusb302_pd_tx_flush(struct fusb302_chip *chip)
>   {
>   	return fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL0,
> @@ -1208,7 +1197,7 @@ static void init_tcpc_dev(struct tcpc_dev *fusb302_tcpc_dev)
>   	fusb302_tcpc_dev->set_polarity = tcpm_set_polarity;
>   	fusb302_tcpc_dev->set_vconn = tcpm_set_vconn;
>   	fusb302_tcpc_dev->set_vbus = tcpm_set_vbus;
> -	fusb302_tcpc_dev->set_current_limit = tcpm_set_current_limit;
> +	fusb302_tcpc_dev->set_current_limit = tcpm_set_current_limit_psy;
>   	fusb302_tcpc_dev->set_pd_rx = tcpm_set_pd_rx;
>   	fusb302_tcpc_dev->set_roles = tcpm_set_roles;
>   	fusb302_tcpc_dev->start_drp_toggling = tcpm_start_drp_toggling;
> @@ -1733,6 +1722,11 @@ static int fusb302_probe(struct i2c_client *client,
>   			return -EPROBE_DEFER;
>   	}
>   
> +	ret = tcpm_register_psy(chip->dev, &chip->tcpc_dev,
> +				"fusb302-typec-source");
> +	if (ret < 0)
> +		return ret;
> +
>   	ret = fusb302_debugfs_init(chip);
>   	if (ret < 0)
>   		return ret;
>