linux-kernel - Re: [PATCH 2/8] net: ethernet: stmmac: update to support all PHY config for stm32mp157c.

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Message-ID: <04801425-ae14-3bfe-4eaf-2f3d552093cb@st.com>
Date:   Thu, 14 Feb 2019 14:48:32 +0000
From:   Christophe ROULLIER <christophe.roullier@...com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "robh@...nel.org" <robh@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "joabreu@...opsys.com" <joabreu@...opsys.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        Peppe CAVALLARO <peppe.cavallaro@...com>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/8] net: ethernet: stmmac: update to support all PHY
 config for stm32mp157c.

On 2/14/19 2:40 PM, Andrew Lunn wrote:
>   On Thu, Feb 14, 2019 at 07:45:57AM +0100, Christophe Roullier wrote:
>> @@ -131,19 +185,19 @@ static int stm32mp1_set_mode(struct plat_stmmacenet_data *plat_dat)
>>   	case PHY_INTERFACE_MODE_RGMII:
>>   		val = SYSCFG_PMCR_ETH_SEL_RGMII;
>> -		if (dwmac->int_phyclk)
>> +		if (dwmac->eth_clk_sel_reg)
>>   			val |= SYSCFG_PMCR_ETH_CLK_SEL;
>>   		pr_debug("SYSCFG init : PHY_INTERFACE_MODE_RGMII\n");
>>   		break;
> 
> Hi Christophe
> 
> This code should handle all 4 PHY_INTERFACE_MODE_RGMII* values.
> 
>       Andrew
> 

Hi Andrew,

For RGMII we are supporting 3 modes:
    - normal mode (with PHY with quartz)
    - Phy wo crystal and phy is clocking with PLL to 25Mhz.
    - other mode where we used PLL from RCC (125Mhz) to clock Ethernet 
IP (save one pin "ETH_CK125")

In driver source code I put table to sum-up all configs supported for 
each phy mode:
+ * Below table summarizes the clock requirement and clock sources for
+ * supported phy interface modes.
+ * 
__________________________________________________________________________
+ *|PHY_MODE | Normal | PHY wo crystal|   PHY wo crystal   |No 125Mhz 
from PHY|
+ *|         |        |      25MHz    |        50MHz       | 
      |
+ * 
---------------------------------------------------------------------------
+ *|  MII    |	 -   |     eth-ck    |	      n/a	  |	  n/a        |
+ *|         |        |		     |                    |		     |
+ * 
---------------------------------------------------------------------------
+ *|  GMII   |	 -   |     eth-ck    |	      n/a	  |	  n/a        |
+ *|         |        |               |                    |		     |
+ * 
---------------------------------------------------------------------------
+ *| RGMII   |	 -   |     eth-ck    |	      n/a	  |  eth-ck (no pin) |
+ *|         |        |               |                    | 
st,eth_clk_sel  |
+ * 
---------------------------------------------------------------------------
+ *| RMII    |	 -   |     eth-ck    |	    eth-ck        |	  n/a        |
+ *|         |        |		     | st,eth_ref_clk_sel |		     |
+ * 
---------------------------------------------------------------------------

Regards,

Christophe