netdev - Re: [PATCH v2 7/7] net: phy: realtek: configure RTL8211E LEDs

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Message-ID: <20190703204559.GH250418@google.com>
Date:   Wed, 3 Jul 2019 13:45:59 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH v2 7/7] net: phy: realtek: configure RTL8211E LEDs

On Wed, Jul 03, 2019 at 10:28:17PM +0200, Heiner Kallweit wrote:
> On 03.07.2019 21:37, Matthias Kaehlcke wrote:
> > Configure the RTL8211E LEDs behavior when the device tree property
> > 'realtek,led-modes' is specified.
> > 
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> > ---
> > Changes in v2:
> > - patch added to the series
> > ---
> >  drivers/net/phy/realtek.c | 63 +++++++++++++++++++++++++++++++++++++--
> >  1 file changed, 61 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
> > index 45fee4612031..559aec547738 100644
> > --- a/drivers/net/phy/realtek.c
> > +++ b/drivers/net/phy/realtek.c
> > @@ -9,6 +9,7 @@
> >   * Copyright (c) 2004 Freescale Semiconductor, Inc.
> >   */
> >  #include <linux/bitops.h>
> > +#include <linux/bits.h>
> >  #include <linux/device.h>
> >  #include <linux/module.h>
> >  #include <linux/of.h>
> > @@ -35,6 +36,15 @@
> >  #define RTL8211E_EEE_LED_MODE1			0x05
> >  #define RTL8211E_EEE_LED_MODE2			0x06
> >  
> > +/* RTL8211E extension page 44 */
> > +#define RTL8211E_LACR				0x1a
> > +#define RLT8211E_LACR_LEDACTCTRL_SHIFT		4
> > +#define RLT8211E_LACR_LEDACTCTRL_MASK		GENMASK(6, 4)
> > +#define RTL8211E_LCR				0x1c
> > +#define RTL8211E_LCR_LEDCTRL_MASK		(GENMASK(2, 0) | \
> > +						 GENMASK(6, 4) | \
> > +						 GENMASK(10, 8))
> > +
> >  /* RTL8211E extension page 160 */
> >  #define RTL8211E_SCR				0x1a
> >  #define RTL8211E_SCR_DISABLE_RXC_SSC		BIT(2)
> > @@ -124,6 +134,56 @@ static int rtl8211e_disable_eee_led_mode(struct phy_device *phydev)
> >  	return phy_restore_page(phydev, oldpage, ret);
> >  }
> >  
> > +static int rtl8211e_config_leds(struct phy_device *phydev)
> > +{
> > +	struct device *dev = &phydev->mdio.dev;
> > +	int count, i, oldpage, ret;
> > +	u16 lacr_bits = 0, lcr_bits = 0;
> > +
> > +	if (!dev->of_node)
> > +		return 0;
> > +
> > +	if (of_property_read_bool(dev->of_node, "realtek,eee-led-mode-disable"))
> > +		rtl8211e_disable_eee_led_mode(phydev);
> > +
> > +	count = of_property_count_elems_of_size(dev->of_node,
> > +						"realtek,led-modes",
> > +						sizeof(u32));
> > +	if (count < 0 || count > 3)
> > +		return -EINVAL;
> > +
> > +	for (i = 0; i < count; i++) {
> > +		u32 val;
> > +
> > +		of_property_read_u32_index(dev->of_node,
> > +					   "realtek,led-modes", i, &val);
> > +		lacr_bits |= (u16)(val >> 16) <<
> > +			(RLT8211E_LACR_LEDACTCTRL_SHIFT + i);
> 
> This may be done in an easier to read way:
> 
> if (val & RTL8211E_LINK_ACTIVITY)
> 	lacr_bits |= BIT(RLT8211E_LACR_LEDACTCTRL_SHIFT + i);

indeed, that's more readable, thanks for the suggestion!

> > +		lcr_bits |= (u16)(val & 0xf) << (i * 4);
> > +	}
> > +
> > +	oldpage = rtl8211e_select_ext_page(phydev, 44);
> > +	if (oldpage < 0) {
> > +		dev_err(dev, "failed to select extended page: %d\n", oldpage);
> 
> In a PHY driver it may be more appropriate to use phydev_err() et al,
> even though effectively it's the same.

sounds good, I'll change it to the phydev_err() et al.

Thanks for the reviews!

Matthias