netdev - Re: [PATCH v2] net: ethernet: stmmac: dwmac-rk: Add GMAC support for PX30

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Date:   Fri, 22 Jun 2018 15:22:35 +0800
From:   David Wu <david.wu@...k-chips.com>
To:     Heiko Stübner <heiko@...ech.de>
Cc:     davem@...emloft.net, robh+dt@...nel.org, mark.rutland@....com,
        huangtao@...k-chips.com, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: ethernet: stmmac: dwmac-rk: Add GMAC support for
 PX30

Hi Heiko,

在 2018年06月14日 16:30, Heiko Stübner 写道:
> And someone could convert the driver to use the new clk-bulk APIs [0],
> so the large number of clk_prepare_enable calls would be a bit
> trimmed down.

Some clocks need special treatment at special cases, may not know which 
index is we need at clk_bulk_data struct.
1. At rmii mode, need to use mac_ref, mac_refout; but at rgmii, they are 
not needed.
2. At rgmii mode, rx is coming in from external source, there is no 
gate, and it is coming from mac_ref_clk at rmii mode, there is gate.
3. clk_mac needs to be configured rate 50M or 125M.
4. mac_clk_speed needs to be configured at PX30 Soc and next Socs.

It looks like use the clk-bulk, will not be more flexible, and we still 
keep the present. What do you think?