linux-kernel - Re: [PATCH 2/6] net: stmmac: fix csr

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Message-ID: <24f4b268-aa7f-e1f7-59fc-2bc163eb8277@st.com>
Date:   Mon, 29 Apr 2019 09:18:41 +0200
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     Biao Huang <biao.huang@...iatek.com>,
        Jose Abreu <joabreu@...opsys.com>, <davem@...emloft.net>
CC:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <netdev@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <yt.shen@...iatek.com>,
        <jianguo.zhang@...iatek.com>
Subject: Re: [PATCH 2/6] net: stmmac: fix csr_clk can't be zero issue

Hi

On 4/28/19 8:30 AM, Biao Huang wrote:
> The specific clk_csr value can be zero, and
> stmmac_clk is necessary for MDC clock which can be set dynamically.
> So, change the condition from plat->clk_csr to plat->stmmac_clk to
> fix clk_csr can't be zero issue.
> 
> Signed-off-by: Biao Huang <biao.huang@...iatek.com>
> ---
>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 818ad88..9e89b94 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -4376,7 +4376,7 @@ int stmmac_dvr_probe(struct device *device,
>   	 * set the MDC clock dynamically according to the csr actual
>   	 * clock input.
>   	 */
> -	if (!priv->plat->clk_csr)
> +	if (priv->plat->stmmac_clk)
>   		stmmac_clk_csr_set(priv);
>   	else
>   		priv->clk_csr = priv->plat->clk_csr;
> 

So, as soon as stmmac_clk will be declared, it is no longer possible to 
fix a CSR through the device tree ?