From: Andrew Lunn <andrew@lunn.ch> To: Christophe Roullier <christophe.roullier@st.com> Cc: robh@kernel.org, davem@davemloft.net, joabreu@synopsys.com, mark.rutland@arm.com, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, peppe.cavallaro@st.com, linux-stm32@st-md-mailman.stormreply.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org Subject: Re: [PATCH V3 net-next 1/4] net: ethernet: stmmac: Add support for syscfg clock Date: Wed, 6 Nov 2019 19:12:40 +0100 [thread overview] Message-ID: <20191106181240.GG30762@lunn.ch> (raw) In-Reply-To: <20191106101220.12693-2-christophe.roullier@st.com> On Wed, Nov 06, 2019 at 11:12:17AM +0100, Christophe Roullier wrote: > 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> > --- > .../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 28 +++++++++++-------- > 1 file changed, 16 insertions(+), 12 deletions(-) > > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c > index 4ef041bdf6a1..be7d58d83cfa 100644 > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c > @@ -152,19 +152,24 @@ static int stm32mp1_clk_prepare(struct stm32_dwmac *dwmac, bool prepare) > int ret = 0; > > if (prepare) { > - ret = clk_prepare_enable(dwmac->syscfg_clk); > - if (ret) > - return ret; > - > + if (dwmac->syscfg_clk) { > + ret = clk_prepare_enable(dwmac->syscfg_clk); > + if (ret) > + return ret; > + } Hi Christophe I think you did not understand what i said. clk_prepare_enable() is happy to take a NULL pointer. So you don't need this new guard. You don't need this change at all. > if (dwmac->clk_eth_ck) { > ret = clk_prepare_enable(dwmac->clk_eth_ck); > if (ret) { > - clk_disable_unprepare(dwmac->syscfg_clk); > + if (dwmac->syscfg_clk) > + clk_disable_unprepare > + (dwmac->syscfg_clk); clk_disable_unprepare() is happy to take a NULL pointer... Andrew
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Lunn <andrew@lunn.ch> To: Christophe Roullier <christophe.roullier@st.com> Cc: mark.rutland@arm.com, robh@kernel.org, alexandre.torgue@st.com, devicetree@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, joabreu@synopsys.com, mcoquelin.stm32@gmail.com, peppe.cavallaro@st.com, davem@davemloft.net, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH V3 net-next 1/4] net: ethernet: stmmac: Add support for syscfg clock Date: Wed, 6 Nov 2019 19:12:40 +0100 [thread overview] Message-ID: <20191106181240.GG30762@lunn.ch> (raw) In-Reply-To: <20191106101220.12693-2-christophe.roullier@st.com> On Wed, Nov 06, 2019 at 11:12:17AM +0100, Christophe Roullier wrote: > 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> > --- > .../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 28 +++++++++++-------- > 1 file changed, 16 insertions(+), 12 deletions(-) > > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c > index 4ef041bdf6a1..be7d58d83cfa 100644 > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c > @@ -152,19 +152,24 @@ static int stm32mp1_clk_prepare(struct stm32_dwmac *dwmac, bool prepare) > int ret = 0; > > if (prepare) { > - ret = clk_prepare_enable(dwmac->syscfg_clk); > - if (ret) > - return ret; > - > + if (dwmac->syscfg_clk) { > + ret = clk_prepare_enable(dwmac->syscfg_clk); > + if (ret) > + return ret; > + } Hi Christophe I think you did not understand what i said. clk_prepare_enable() is happy to take a NULL pointer. So you don't need this new guard. You don't need this change at all. > if (dwmac->clk_eth_ck) { > ret = clk_prepare_enable(dwmac->clk_eth_ck); > if (ret) { > - clk_disable_unprepare(dwmac->syscfg_clk); > + if (dwmac->syscfg_clk) > + clk_disable_unprepare > + (dwmac->syscfg_clk); clk_disable_unprepare() is happy to take a NULL pointer... Andrew _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-11-06 18:12 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-11-06 10:12 [PATCH V3 net-next 0/4] net: ethernet: stmmac: cleanup clock and optimization Christophe Roullier 2019-11-06 10:12 ` Christophe Roullier 2019-11-06 10:12 ` [PATCH V3 net-next 1/4] net: ethernet: stmmac: Add support for syscfg clock Christophe Roullier 2019-11-06 10:12 ` Christophe Roullier 2019-11-06 18:12 ` Andrew Lunn [this message] 2019-11-06 18:12 ` Andrew Lunn 2019-11-06 10:12 ` [PATCH V3 net-next 2/4] ARM: dts: stm32: remove syscfg clock on stm32mp157c ethernet Christophe Roullier 2019-11-06 10:12 ` Christophe Roullier 2019-11-06 10:12 ` [PATCH V3 net-next 3/4] ARM: dts: stm32: adjust slew rate for Ethernet Christophe Roullier 2019-11-06 10:12 ` Christophe Roullier 2019-11-06 10:12 ` [PATCH V3 net-next 4/4] ARM: dts: stm32: Enable gating of the MAC TX clock during TX low-power mode on stm32mp157c Christophe Roullier 2019-11-06 10:12 ` Christophe Roullier
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