linux-kernel - Re: [RFC PATCH 2/4] phy: rockchip: Add inno_is_valid_phy

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Message-ID: <Y8GbtA7+xHtBEpRs@matsya>
Date:   Fri, 13 Jan 2023 23:28:12 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Michael Trimarchi <michael@...rulasolutions.com>
Cc:     Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Kishon Vijay Abraham I <kishon@...com>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-amarula@...rulasolutions.com
Subject: Re: [RFC PATCH 2/4] phy: rockchip: Add inno_is_valid_phy_mode

On 02-10-22, 08:45, Michael Trimarchi wrote:
> The function is used to avoid to enable clock on the hardware
> if the mode requested is invalid
> 
> Signed-off-by: Michael Trimarchi <michael@...rulasolutions.com>
> ---
>  .../phy/rockchip/phy-rockchip-inno-dsidphy.c  | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c b/drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c
> index 630e01b5c19b..644cf73cfd53 100644
> --- a/drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c
> +++ b/drivers/phy/rockchip/phy-rockchip-inno-dsidphy.c
> @@ -217,6 +217,20 @@ static void phy_update_bits(struct inno_dsidphy *inno,
>  	writel(tmp, inno->phy_base + reg);
>  }
>  
> +static int inno_is_valid_phy_mode(struct inno_dsidphy *inno)
> +{
> +	switch (inno->mode) {
> +	case PHY_MODE_MIPI_DPHY:
> +		break;
> +	case PHY_MODE_LVDS:
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +};
> +
>  static unsigned long inno_dsidphy_pll_calc_rate(struct inno_dsidphy *inno,
>  						unsigned long rate)
>  {
> @@ -495,6 +509,11 @@ static void inno_dsidphy_lvds_mode_enable(struct inno_dsidphy *inno)
>  static int inno_dsidphy_power_on(struct phy *phy)
>  {
>  	struct inno_dsidphy *inno = phy_get_drvdata(phy);
> +	int ret = 0;

this initialization is superfluous

> +
> +	ret = inno_is_valid_phy_mode(inno);
> +	if (ret)
> +		return ret;
>  
>  	clk_prepare_enable(inno->pclk_phy);
>  	clk_prepare_enable(inno->ref_clk);
> -- 
> 2.34.1

-- 
~Vinod