From: Andrew Lunn <andrew@lunn.ch>
To: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: robh+dt@kernel.org, f.fainelli@gmail.com,
linux-amlogic@lists.infradead.org, devicetree@vger.kernel.org,
jianxin.pan@amlogic.com, davem@davemloft.net,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH RFC v2 08/11] net: stmmac: dwmac-meson8b: add support for the RX delay configuration
Date: Fri, 1 May 2020 17:44:48 +0200 [thread overview]
Message-ID: <20200501154448.GH128733@lunn.ch> (raw)
In-Reply-To: <20200429201644.1144546-9-martin.blumenstingl@googlemail.com>
> + if (rx_dly_config & PRG_ETH0_ADJ_ENABLE) {
> + /* The timing adjustment logic is driven by a separate clock */
> + ret = meson8b_devm_clk_prepare_enable(dwmac,
> + dwmac->timing_adj_clk);
> + if (ret) {
> + dev_err(dwmac->dev,
> + "Failed to enable the timing-adjustment clock\n");
> + return ret;
> + }
> + }
Hi Martin
It is a while since i used the clk API. I thought the get_optional()
call returned a NULL pointer if the clock does not exist.
clk_prepare_enable() passed a NULL pointer is a NOP, but it also does
not return an error. So if the clock does not exist, you won't get
this error, the code keeps going, configures the hardware, but it does
not work.
I think you need to check dwmac->timing_adj_clk != NULL here, and
error out if DT has properties which require it.
Andrew
next prev parent reply other threads:[~2020-05-01 15:44 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-29 20:16 [PATCH RFC v2 00/11] dwmac-meson8b Ethernet RX delay configuration Martin Blumenstingl
2020-04-29 20:16 ` [PATCH RFC v2 01/11] dt-bindings: net: meson-dwmac: Add the amlogic,rx-delay-ns property Martin Blumenstingl
2020-05-01 15:26 ` Andrew Lunn
2020-05-12 14:51 ` Rob Herring
2020-04-29 20:16 ` [PATCH RFC v2 02/11] dt-bindings: net: dwmac-meson: Document the "timing-adjustment" clock Martin Blumenstingl
2020-05-01 15:27 ` Andrew Lunn
2020-05-01 21:09 ` Rob Herring
2020-05-01 21:53 ` Martin Blumenstingl
2020-05-10 22:34 ` Martin Blumenstingl
2020-04-29 20:16 ` [PATCH RFC v2 03/11] net: stmmac: dwmac-meson8b: use FIELD_PREP instead of open-coding it Martin Blumenstingl
2020-05-01 15:28 ` Andrew Lunn
2020-04-29 20:16 ` [PATCH RFC v2 04/11] net: stmmac: dwmac-meson8b: Move the documentation for the TX delay Martin Blumenstingl
2020-05-01 15:29 ` Andrew Lunn
2020-04-29 20:16 ` [PATCH RFC v2 05/11] net: stmmac: dwmac-meson8b: Add the PRG_ETH0_ADJ_* bits Martin Blumenstingl
2020-05-01 15:33 ` Andrew Lunn
2020-04-29 20:16 ` [PATCH RFC v2 06/11] net: stmmac: dwmac-meson8b: Fetch the "timing-adjustment" clock Martin Blumenstingl
2020-05-01 15:35 ` Andrew Lunn
2020-04-29 20:16 ` [PATCH RFC v2 07/11] net: stmmac: dwmac-meson8b: Make the clock enabling code re-usable Martin Blumenstingl
2020-05-01 15:37 ` Andrew Lunn
2020-04-29 20:16 ` [PATCH RFC v2 08/11] net: stmmac: dwmac-meson8b: add support for the RX delay configuration Martin Blumenstingl
2020-05-01 15:44 ` Andrew Lunn [this message]
2020-05-01 17:10 ` Martin Blumenstingl
2020-04-29 20:16 ` [PATCH DO NOT MERGE v2 09/11] arm64: dts: amlogic: Add the Ethernet "timing-adjustment" clock Martin Blumenstingl
2020-04-29 20:16 ` [PATCH DO NOT MERGE v2 10/11] ARM: dts: meson: " Martin Blumenstingl
2020-04-29 20:16 ` [PATCH DO NOT MERGE v2 11/11] ARM: dts: meson: Switch existing boards with RGMII PHY to "rgmii-id" Martin Blumenstingl
2020-04-29 21:29 ` [PATCH RFC v2 00/11] dwmac-meson8b Ethernet RX delay configuration Andrew Lunn
2020-05-01 14:49 ` Martin Blumenstingl
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