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net: ethernet: stmmac: Add support for syscfg clock

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Add optional support for syscfg clock in dwmac-stm32.c
Now Syscfg clock is activated automatically when syscfg
registers are used

Signed-off-by: Christophe Roullier <christophe.roullier@st.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christophe Roullier 2019-11-07 09:47:54 +01:00 committed by David S. Miller
parent d408bef4bf
commit caee317473
1 changed files with 8 additions and 15 deletions
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23
drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
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@ -155,18 +155,14 @@ static int stm32mp1_clk_prepare(struct stm32_dwmac *dwmac, bool prepare)
ret = clk_prepare_enable(dwmac->syscfg_clk);
if (ret)
return ret;
if (dwmac->clk_eth_ck) {
ret = clk_prepare_enable(dwmac->clk_eth_ck);
if (ret) {
clk_disable_unprepare(dwmac->syscfg_clk);
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);
if (dwmac->clk_eth_ck)
clk_disable_unprepare(dwmac->clk_eth_ck);
clk_disable_unprepare(dwmac->clk_eth_ck);
}
return ret;
}
@ -320,12 +316,10 @@ static int stm32mp1_parse_data(struct stm32_dwmac *dwmac,
return PTR_ERR(dwmac->clk_ethstp);
}
/* Clock for sysconfig */
/* Optional Clock for sysconfig */
dwmac->syscfg_clk = devm_clk_get(dev, "syscfg-clk");
if (IS_ERR(dwmac->syscfg_clk)) {
dev_err(dev, "No syscfg clock provided...\n");
return PTR_ERR(dwmac->syscfg_clk);
}
if (IS_ERR(dwmac->syscfg_clk))
dwmac->syscfg_clk = NULL;
/* Get IRQ information early to have an ability to ask for deferred
* probe if needed before we went too far with resource allocation.
@ -437,8 +431,7 @@ static int stm32mp1_suspend(struct stm32_dwmac *dwmac)
clk_disable_unprepare(dwmac->clk_tx);
clk_disable_unprepare(dwmac->syscfg_clk);
if (dwmac->clk_eth_ck)
clk_disable_unprepare(dwmac->clk_eth_ck);
clk_disable_unprepare(dwmac->clk_eth_ck);
return ret;
}