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Date: Tue, 14 Apr 2020 15:10:26 +0000
From: Christophe ROULLIER <christophe.roullier@...com>
To: Alexandre TORGUE <alexandre.torgue@...com>,
"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>,
Peppe CAVALLARO <peppe.cavallaro@...com>
CC: "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>,
"andrew@...n.ch" <andrew@...n.ch>
Subject: Re: [PATCHv2 1/1] net: ethernet: stmmac: simplify phy modes
management for stm32
Hi,
Gentle reminder
Thanks,
Christophe.
On 01/04/2020 16:17, Alexandre Torgue wrote:
> Hi Christophe
>
> On 3/16/20 10:09 AM, Christophe Roullier wrote:
>> No new feature, just to simplify stm32 part to be easier to use.
>> Add by default all Ethernet clocks in DT, and activate or not in
>> function
>> of phy mode, clock frequency, if property "st,ext-phyclk" is set or not.
>> Keep backward compatibility
>> -----------------------------------------------------------------------
>> |PHY_MODE | Normal | PHY wo crystal| PHY wo crystal | No 125Mhz |
>> | | | 25MHz | 50MHz | from PHY |
>> -----------------------------------------------------------------------
>> | MII | - | eth-ck | n/a | n/a |
>> | | | st,ext-phyclk | | |
>> -----------------------------------------------------------------------
>> | GMII | - | eth-ck | n/a | n/a |
>> | | | st,ext-phyclk | | |
>> -----------------------------------------------------------------------
>> | RGMII | - | eth-ck | n/a | eth-ck |
>> | | | st,ext-phyclk | |st,eth-clk-sel|
>> | | | | | or |
>> | | | | | st,ext-phyclk|
>> ------------------------------------------------------------------------
>> | RMII | - | eth-ck | eth-ck | n/a |
>> | | | st,ext-phyclk | st,eth-ref-clk-sel | |
>> | | | | or st,ext-phyclk | |
>> ------------------------------------------------------------------------
>>
>> Signed-off-by: Christophe Roullier <christophe.roullier@...com>
>>
>> ---
>
> Acked-by: Alexandre TORGUE <alexandre.torgue@...com>
>
>
>> .../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 74 +++++++++++--------
>> 1 file changed, 44 insertions(+), 30 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
>> b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
>> index b2dc99289687..5d4df4c5254e 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
>> @@ -29,6 +29,11 @@
>> #define SYSCFG_PMCR_ETH_CLK_SEL BIT(16)
>> #define SYSCFG_PMCR_ETH_REF_CLK_SEL BIT(17)
>> +/* CLOCK feed to PHY*/
>> +#define ETH_CK_F_25M 25000000
>> +#define ETH_CK_F_50M 50000000
>> +#define ETH_CK_F_125M 125000000
>> +
>> /* Ethernet PHY interface selection in register SYSCFG Configuration
>> *------------------------------------------
>> * src |BIT(23)| BIT(22)| BIT(21)|BIT(20)|
>> @@ -58,33 +63,20 @@
>> *| | | 25MHz | 50MHz
>> | |
>> *
>> ---------------------------------------------------------------------------
>> *| MII | - | eth-ck | n/a |
>> n/a |
>> - *| | | | | |
>> + *| | | st,ext-phyclk | | |
>> *
>> ---------------------------------------------------------------------------
>> *| GMII | - | eth-ck | n/a |
>> n/a |
>> - *| | | | | |
>> + *| | | st,ext-phyclk | | |
>> *
>> ---------------------------------------------------------------------------
>> - *| RGMII | - | eth-ck | n/a | eth-ck
>> (no pin) |
>> - *| | | | |
>> st,eth-clk-sel |
>> + *| RGMII | - | eth-ck | n/a |
>> eth-ck |
>> + *| | | st,ext-phyclk | |
>> st,eth-clk-sel or|
>> + *| | | | |
>> st,ext-phyclk |
>> *
>> ---------------------------------------------------------------------------
>> *| RMII | - | eth-ck | eth-ck |
>> n/a |
>> - *| | | | st,eth-ref-clk-sel | |
>> + *| | | st,ext-phyclk | st,eth-ref-clk-sel
>> | |
>> + *| | | | or st,ext-phyclk | |
>> *
>> ---------------------------------------------------------------------------
>> *
>> - * BIT(17) : set this bit in RMII mode when you have PHY without
>> crystal 50MHz
>> - * BIT(16) : set this bit in GMII/RGMII PHY when you do not want use
>> 125Mhz
>> - * from PHY
>> - *-----------------------------------------------------
>> - * src | BIT(17) | BIT(16) |
>> - *-----------------------------------------------------
>> - * MII | n/a | n/a |
>> - *-----------------------------------------------------
>> - * GMII | n/a | st,eth-clk-sel |
>> - *-----------------------------------------------------
>> - * RGMII | n/a | st,eth-clk-sel |
>> - *-----------------------------------------------------
>> - * RMII | st,eth-ref-clk-sel | n/a |
>> - *-----------------------------------------------------
>> - *
>> */
>> struct stm32_dwmac {
>> @@ -93,6 +85,8 @@ struct stm32_dwmac {
>> struct clk *clk_eth_ck;
>> struct clk *clk_ethstp;
>> struct clk *syscfg_clk;
>> + int ext_phyclk;
>> + int enable_eth_ck;
>> int eth_clk_sel_reg;
>> int eth_ref_clk_sel_reg;
>> int irq_pwr_wakeup;
>> @@ -155,14 +149,17 @@ static int stm32mp1_clk_prepare(struct
>> stm32_dwmac *dwmac, bool prepare)
>> ret = clk_prepare_enable(dwmac->syscfg_clk);
>> if (ret)
>> return ret;
>> - ret = clk_prepare_enable(dwmac->clk_eth_ck);
>> - if (ret) {
>> - clk_disable_unprepare(dwmac->syscfg_clk);
>> - return ret;
>> + if (dwmac->enable_eth_ck) {
>> + ret = clk_prepare_enable(dwmac->clk_eth_ck);
>> + if (ret) {
>> + clk_disable_unprepare(dwmac->syscfg_clk);
>> + return ret;
>> + }
>> }
>> } else {
>> clk_disable_unprepare(dwmac->syscfg_clk);
>> - clk_disable_unprepare(dwmac->clk_eth_ck);
>> + if (dwmac->enable_eth_ck)
>> + clk_disable_unprepare(dwmac->clk_eth_ck);
>> }
>> return ret;
>> }
>> @@ -170,24 +167,34 @@ static int stm32mp1_clk_prepare(struct
>> stm32_dwmac *dwmac, bool prepare)
>> static int stm32mp1_set_mode(struct plat_stmmacenet_data *plat_dat)
>> {
>> struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
>> - u32 reg = dwmac->mode_reg;
>> + u32 reg = dwmac->mode_reg, clk_rate;
>> int val;
>> + clk_rate = clk_get_rate(dwmac->clk_eth_ck);
>> + dwmac->enable_eth_ck = false;
>> switch (plat_dat->interface) {
>> case PHY_INTERFACE_MODE_MII:
>> + if (clk_rate == ETH_CK_F_25M && dwmac->ext_phyclk)
>> + dwmac->enable_eth_ck = true;
>> val = SYSCFG_PMCR_ETH_SEL_MII;
>> pr_debug("SYSCFG init : PHY_INTERFACE_MODE_MII\n");
>> break;
>> case PHY_INTERFACE_MODE_GMII:
>> val = SYSCFG_PMCR_ETH_SEL_GMII;
>> - if (dwmac->eth_clk_sel_reg)
>> + if (clk_rate == ETH_CK_F_25M &&
>> + (dwmac->eth_clk_sel_reg || dwmac->ext_phyclk)) {
>> + dwmac->enable_eth_ck = true;
>> val |= SYSCFG_PMCR_ETH_CLK_SEL;
>> + }
>> pr_debug("SYSCFG init : PHY_INTERFACE_MODE_GMII\n");
>> break;
>> case PHY_INTERFACE_MODE_RMII:
>> val = SYSCFG_PMCR_ETH_SEL_RMII;
>> - if (dwmac->eth_ref_clk_sel_reg)
>> + if ((clk_rate == ETH_CK_F_25M || clk_rate == ETH_CK_F_50M) &&
>> + (dwmac->eth_ref_clk_sel_reg || dwmac->ext_phyclk)) {
>> + dwmac->enable_eth_ck = true;
>> val |= SYSCFG_PMCR_ETH_REF_CLK_SEL;
>> + }
>> pr_debug("SYSCFG init : PHY_INTERFACE_MODE_RMII\n");
>> break;
>> case PHY_INTERFACE_MODE_RGMII:
>> @@ -195,8 +202,11 @@ static int stm32mp1_set_mode(struct
>> plat_stmmacenet_data *plat_dat)
>> case PHY_INTERFACE_MODE_RGMII_RXID:
>> case PHY_INTERFACE_MODE_RGMII_TXID:
>> val = SYSCFG_PMCR_ETH_SEL_RGMII;
>> - if (dwmac->eth_clk_sel_reg)
>> + if ((clk_rate == ETH_CK_F_25M || clk_rate == ETH_CK_F_125M) &&
>> + (dwmac->eth_clk_sel_reg || dwmac->ext_phyclk)) {
>> + dwmac->enable_eth_ck = true;
>> val |= SYSCFG_PMCR_ETH_CLK_SEL;
>> + }
>> pr_debug("SYSCFG init : PHY_INTERFACE_MODE_RGMII\n");
>> break;
>> default:
>> @@ -294,6 +304,9 @@ static int stm32mp1_parse_data(struct stm32_dwmac
>> *dwmac,
>> struct device_node *np = dev->of_node;
>> int err = 0;
>> + /* Ethernet PHY have no crystal */
>> + dwmac->ext_phyclk = of_property_read_bool(np, "st,ext-phyclk");
>> +
>> /* Gigabit Ethernet 125MHz clock selection. */
>> dwmac->eth_clk_sel_reg = of_property_read_bool(np,
>> "st,eth-clk-sel");
>> @@ -431,7 +444,8 @@ static int stm32mp1_suspend(struct stm32_dwmac
>> *dwmac)
>> clk_disable_unprepare(dwmac->clk_tx);
>> clk_disable_unprepare(dwmac->syscfg_clk);
>> - clk_disable_unprepare(dwmac->clk_eth_ck);
>> + if (dwmac->enable_eth_ck)
>> + clk_disable_unprepare(dwmac->clk_eth_ck);
>> return ret;
>> }
>>
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