linux-kernel - Re: [PATCH net-next 2/3] net: phy: add amlogic g12a mdio mux support

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Message-ID: <5b9b363f00acdcd83cce1a3e7bddda71edac9c06.camel@baylibre.com>
Date:   Mon, 18 Mar 2019 10:34:02 +0100
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Kevin Hilman <khilman@...libre.com>, netdev@...r.kernel.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH net-next 2/3] net: phy: add amlogic g12a mdio mux support

On Sun, 2019-03-17 at 17:14 +0100, Andrew Lunn wrote:
> On Thu, Mar 14, 2019 at 03:01:34PM +0100, Jerome Brunet wrote:
> > Add support for the mdio mux and internal phy glue of the g12a SoC family
> > 
> > Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
> > ---
> >  drivers/net/phy/Kconfig               |  10 +
> >  drivers/net/phy/Makefile              |   1 +
> >  drivers/net/phy/mdio-mux-meson-g12a.c | 371 ++++++++++++++++++++++++++
> >  3 files changed, 382 insertions(+)
> >  create mode 100644 drivers/net/phy/mdio-mux-meson-g12a.c
> > 
> > diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
> > index 071869db44cf..831aa350b1cb 100644
> > --- a/drivers/net/phy/Kconfig
> > +++ b/drivers/net/phy/Kconfig
> > @@ -74,6 +74,16 @@ config MDIO_BUS_MUX_GPIO
> >  	  several child MDIO busses to a parent bus.  Child bus
> >  	  selection is under the control of GPIO lines.
> >  
> > +config MDIO_BUS_MUX_MESON_G12A
> > +	tristate "Amlogic G12a based MDIO bus multiplexer"
> > +	depends on ARCH_MESON || COMPILE_TEST
> > +	depends on OF_MDIO && HAS_IOMEM
> > +	select MDIO_BUS_MUX
> 
> Hi Jerome
> 
> Do you need some clock depends? 

I don't think we need more. ARCH_MESON already selects the necessary clock
parts. As for the COMPILE_TEST, the clock code should be able to compile even
if the common clock framework is disabled.

> 
> > +static int g12a_mdio_switch_fn(int current_child, int desired_child,
> > +			       void *data)
> > +{
> > +	struct device *dev = data;
> > +	struct g12a_mdio_mux *priv = dev_get_drvdata(dev);
> 
> David won't like that you don't have reverse Christmas tree. You need
> to do the assignment to priv in the body of the code. Or can you pass
> data directly to dev_get_drvdata?
> 
> > +static int g12a_mdio_mux_probe(struct platform_device *pdev)
> > +{
> > +	struct device *dev = &pdev->dev;
> > +	struct resource *res;
> > +	struct g12a_mdio_mux *priv;
> > +	int ret;
> 
> Reverse Christmas tree please.

I'll fix these

> 
> 
> > +
> > +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > +	if (!priv)
> > +		return -ENOMEM;
> > +
> > +	platform_set_drvdata(pdev, priv);
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	priv->regs = devm_ioremap_resource(dev, res);
> > +	if (IS_ERR(priv->regs))
> > +		return PTR_ERR(priv->regs);
> > +
> > +	priv->pclk = devm_clk_get(dev, "pclk");
> > +	if (IS_ERR(priv->pclk)) {
> > +		ret = PTR_ERR(priv->pclk);
> > +		if (ret != -EPROBE_DEFER)
> > +			dev_err(dev, "failed to get peripheral clock\n");
> > +		return ret;
> > +	}
> > +
> > +	/* Make sure the device registers are clocked */
> > +	ret = clk_prepare_enable(priv->pclk);
> > +	if (ret) {
> > +		dev_err(dev, "failed to enable peripheral clock");
> > +		return ret;
> > +	}
> > +
> > +	/* Register PLL in CCF */
> > +	ret = g12a_ephy_glue_clk_register(dev);
> 
> On error, you are not disabling the peripheral clock.

Indeed, good catch. Thx

> 
> > +	if (ret)
> > +		return ret;
> > +
> > +	return mdio_mux_init(dev, dev->of_node, g12a_mdio_switch_fn,
> > +			     &priv->mux_handle, dev, NULL);
> > +}
> 
>   Andrew