linux-kernel - Re: [PATCH v5 21/44] clk: davinci: New driver for TI DA8XX USB PHY clocks

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Date:   Thu, 18 Jan 2018 18:35:39 +0530
From:   Sekhar Nori <nsekhar@...com>
To:     David Lechner <david@...hnology.com>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Hilman <khilman@...nel.org>,
        Adam Ford <aford173@...il.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 21/44] clk: davinci: New driver for TI DA8XX USB PHY
 clocks

On Monday 08 January 2018 07:47 AM, David Lechner wrote:

> +static int da8xx_usb1_phy_clk_set_parent(struct clk_hw *hw, u8 index)
> +{
> +	struct da8xx_usb1_phy_clk *clk = to_da8xx_usb1_phy_clk(hw);
> +	unsigned int mask, val;
> +
> +	/* Set the USB 1.1 PHY clock mux based on the parent clock. */
> +	mask = CFGCHIP2_USB1PHYCLKMUX;
> +	switch (index) {
> +	case DA8XX_USB1_PHY_CLK_PARENT_USB_REFCLKIN:
> +		val = CFGCHIP2_USB1PHYCLKMUX;
> +		break;
> +	case DA8XX_USB1_PHY_CLK_PARENT_USB0_PHY_PLL:
> +		val = 0;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	regmap_write_bits(clk->regmap, CFGCHIP(2), mask, val);

This function can be simplified quite a bit if you use a shift.

#define CFGCHIP2_USB1PHYCLKMUX_SHIFT	12

static int da8xx_usb1_phy_clk_set_parent(struct clk_hw *hw, u8 index)
{
	struct da8xx_usb1_phy_clk *clk = to_da8xx_usb1_phy_clk(hw);

	regmap_write_bits(clk->regmap, CFGCHIP(2),
			  CFGCHIP2_USB1PHYCLKMUX,
			  index << CFGCHIP2_USB1PHYCLKMUX_SHIFT);
}

Same thing for da8xx_usb0_phy_clk_set_parent() as well.

Thanks,
Sekhar