From: Russell King - ARM Linux <linux@armlinux.org.uk>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Arun Parameswaran <arun.parameswaran@broadcom.com>,
Florian Fainelli <f.fainelli@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>, Ray Jui <rjui@broadcom.com>,
Scott Branden <sbranden@broadcom.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
netdev@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org
Subject: Re: [PATCH v3 7/8] net: phy: Add support to configure clock in Broadcom iProc mdio mux
Date: Wed, 1 Aug 2018 21:23:14 +0100 [thread overview]
Message-ID: <20180801202313.GH30658@n2100.armlinux.org.uk> (raw)
In-Reply-To: <20180801200712.GD19257@lunn.ch>
On Wed, Aug 01, 2018 at 10:07:12PM +0200, Andrew Lunn wrote:
> You might want to consider adding clk_optional_get() and
> devm_clk_optional_get().
I think there's attempts to add such APIs but I don't think it's
trivial - it seems to require a _lot_ of discussion.
I think part of that is because of the quirky use of error codes.
If you look at clk_get(), it calls __of_clk_get_by_name() which
returns:
-ENOENT if DT is disabled
-ENOENT if the device has no DT node
-EPROBE_DEFER if the lookup in DT succeeds but there's no registered
clock
-EINVAL if the device has a DT node but the lookup of the name
failed (in otherwords, the optional clock was omitted)
-ENOENT if the clocks = property has not enough clocks for the
clock-names property
-ENOMEM if we fail to allocate the clk
-ENOENT if __clk_get() fails
or any other error code returned via of_clk_provider's ->get() method.
The use of -EINVAL, one of the most common error codes, makes it
difficult to be sure that the clock is not specified in DT.
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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next prev parent reply other threads:[~2018-08-01 20:23 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-01 17:56 [PATCH v3 0/8] Add clock config and pm support to bcm iProc mdio mux Arun Parameswaran
2018-08-01 17:56 ` [PATCH v3 1/8] dt-bindings: net: Fix Broadcom iProc mdio mux driver base address Arun Parameswaran
2018-08-01 17:56 ` [PATCH v3 2/8] net: phy: Fix the register offsets in Broadcom iProc mdio mux driver Arun Parameswaran
2018-08-01 17:56 ` [PATCH v3 3/8] arm64: dts: Fix the base address of the Broadcom iProc mdio mux Arun Parameswaran
2018-08-01 17:56 ` [PATCH v3 4/8] net: phy: Disable external master access in bcm mdio mux driver Arun Parameswaran
2018-08-01 17:56 ` [PATCH v3 5/8] net: phy: Use devm api for mdio bus allocation in bcm iproc mdio mux Arun Parameswaran
2018-08-01 18:37 ` Florian Fainelli
2018-08-01 17:56 ` [PATCH v3 6/8] dt-bindings: net: Add clock handle to Broadcom iProc " Arun Parameswaran
2018-08-01 17:56 ` [PATCH v3 7/8] net: phy: Add support to configure clock in " Arun Parameswaran
2018-08-01 18:40 ` Florian Fainelli
2018-08-01 18:46 ` Russell King - ARM Linux
2018-08-01 19:55 ` Arun Parameswaran
2018-08-01 20:07 ` Andrew Lunn
2018-08-01 20:23 ` Russell King - ARM Linux [this message]
2018-08-01 20:38 ` Andrew Lunn
2018-08-01 21:45 ` Arun Parameswaran
2018-08-01 21:55 ` Andrew Lunn
2018-08-01 22:10 ` Arun Parameswaran
2018-08-01 22:18 ` Andrew Lunn
2018-08-01 17:56 ` [PATCH v3 8/8] net: phy: Add pm support to Broadcom iProc mdio mux driver Arun Parameswaran
2018-08-01 18:39 ` Florian Fainelli
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