netdev - Re: [PATCH net-next 1/5] net: dsa: b53: Add support for Broadcom RoboSwitch

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Date:	Fri, 10 Jun 2016 11:49:08 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	netdev@...r.kernel.org, vivien.didelot@...oirfairelinux.com,
	davem@...emloft.net, jon.mason@...adcom.com,
	hemal.shah@...adcom.com, bandaru.viswanath@...adcom.com,
	michael.chan@...adcom.com, jogo@...nwrt.org, cphealy@...il.com,
	ardeleanalex@...il.com, jiri@...lanox.com, idosch@...lanox.com
Subject: Re: [PATCH net-next 1/5] net: dsa: b53: Add support for Broadcom
 RoboSwitch

On 06/10/2016 05:11 AM, Andrew Lunn wrote:
>> +static void b53_switch_reset_gpio(struct b53_device *dev)
>> +{
>> +	int gpio = dev->reset_gpio;
>> +
>> +	if (gpio < 0)
>> +		return;
>> +
>> +	/* Reset sequence: RESET low(50ms)->high(20ms)
>> +	 */
>> +	gpio_set_value(gpio, 0);
>> +	mdelay(50);
>> +
>> +	gpio_set_value(gpio, 1);
>> +	mdelay(20);
>> +
>> +	dev->current_page = 0xff;
>> +}
> 
> Hi Florian
> 
> It would be better to use the gpiod API here, so the active hi/active
> low flag is respected.

OK.

> 
>> +	dev->reset_gpio = b53_switch_get_reset_gpio(dev);
>> +	if (dev->reset_gpio >= 0) {
>> +		ret = devm_gpio_request_one(dev->dev, dev->reset_gpio,
>> +					    GPIOF_OUT_INIT_HIGH, "robo_reset");
>> +		if (ret)
>> +			return ret;
>> +	}
>> +
>> +	return 0;
>> +}
> 
>> +static inline int b53_switch_get_reset_gpio(struct b53_device *dev)
>> +{
>> +	enum bcm47xx_board board = bcm47xx_board_get();
>> +
>> +	switch (board) {
>> +	case BCM47XX_BOARD_LINKSYS_WRT300NV11:
>> +	case BCM47XX_BOARD_LINKSYS_WRT310NV1:
>> +		return 8;
> 
> Rather than hard coding it, could we get it from device tree?

Difficult for now, this is for in-tree MIPS-based platforms under
arch/mips/bcm47xx, which are using SSB/platform data.
-- 
Florian