From: Conor Dooley <conor@kernel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Conor Dooley <conor.dooley@microchip.com>,
Hal Feng <hal.feng@starfivetech.com>,
linux-riscv@lists.infradead.org, devicetree@vger.kernel.org,
linux-clk@vger.kernel.org, Palmer Dabbelt <palmer@dabbelt.com>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Stephen Boyd <sboyd@kernel.org>,
Michael Turquette <mturquette@baylibre.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
Emil Renner Berthing <emil.renner.berthing@canonical.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 07/11] dt-bindings: clock: Add StarFive JH7110 system clock and reset generator
Date: Fri, 17 Feb 2023 16:27:34 +0000 [thread overview]
Message-ID: <Y++q9ln8P3XegqfN@spud> (raw)
In-Reply-To: <dcba75b5-7b62-35aa-6836-5d5edd785002@linaro.org>
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On Fri, Feb 17, 2023 at 04:47:48PM +0100, Krzysztof Kozlowski wrote:
> On 17/02/2023 14:32, Conor Dooley wrote:
> >>>> Yes, it is.
> >>>
> >>> Which would then make GMAC1 RGMII RX optional, rather than required?
> >>
> >> If thinking in this way, I must say yes, it is optional. But actually
> >> GMAC1 RGMII RX feeds gmac1_rx by default.
> >> For a mux, it usually works if you populate only one input to it.
> >> Does it mean all the other inputs are optional? And how can we define
> >> which input is required?
> >
> > I'm not sure, that is a question for Krzysztof and/or Rob.
>
> That's a long thread, please summarize what you ask. Otherwise I have no
> clue what is the question.
Sorry. I tried to preserve the context of the conversation the last time
I cropped it so that things would be contained on one email.
For me at least, I am wondering how you convey that out of a list of
clock inputs (for example a, b, c, d) that two of the clocks are inputs
to a mux and it is only required to provide one of the two (say b & c).
> Does the mux works correctly if clock input is not connected? I mean,
> are you now talking about real hardware or some simplification from SW
> point of view?
I'm coming at this from an angle of "is a StarFive customer going to show
up with a devicetree containing dummy fixed-clocks to satisfy dtbs_check
because they opted to only populate one input to the mux".
I don't really care about implications for the driver, just about
whether the hardware allows for inputs to the mux to be left
un-populated.
Cheers,
Conor.
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next prev parent reply other threads:[~2023-02-17 16:28 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-20 0:50 [PATCH v3 00/11] Basic clock and reset support for StarFive JH7110 RISC-V SoC Hal Feng
2022-12-20 0:50 ` [PATCH v3 01/11] clk: starfive: Factor out common JH7100 and JH7110 code Hal Feng
2022-12-20 21:54 ` Conor Dooley
2022-12-20 0:50 ` [PATCH v3 02/11] clk: starfive: Rename "jh7100" to "jh71x0" for the common code Hal Feng
2022-12-20 22:08 ` Conor Dooley
2022-12-23 6:23 ` Hal Feng
2022-12-20 0:50 ` [PATCH v3 03/11] reset: Create subdirectory for StarFive drivers Hal Feng
2022-12-20 22:15 ` Conor Dooley
2022-12-23 7:02 ` Hal Feng
2022-12-20 0:50 ` [PATCH v3 04/11] reset: starfive: Factor out common JH71X0 reset code Hal Feng
2022-12-20 22:28 ` Conor Dooley
2022-12-23 7:49 ` Hal Feng
2022-12-20 0:50 ` [PATCH v3 05/11] reset: starfive: Rename "jh7100" to "jh71x0" for the common code Hal Feng
2022-12-20 2:40 ` kernel test robot
2022-12-20 22:31 ` Conor Dooley
2022-12-24 3:48 ` kernel test robot
2022-12-20 0:50 ` [PATCH v3 06/11] reset: starfive: jh71x0: Use 32bit I/O on 32bit registers Hal Feng
2022-12-20 22:49 ` Conor Dooley
2022-12-20 0:50 ` [PATCH v3 07/11] dt-bindings: clock: Add StarFive JH7110 system clock and reset generator Hal Feng
2022-12-20 20:12 ` Rob Herring
2022-12-20 23:14 ` Conor Dooley
2022-12-20 23:16 ` Conor Dooley
2022-12-25 16:26 ` Hal Feng
2022-12-27 20:15 ` Conor Dooley
2023-02-16 14:42 ` Hal Feng
2023-02-16 18:20 ` Conor Dooley
2023-02-17 2:27 ` Hal Feng
2023-02-17 7:51 ` Conor Dooley
2023-02-17 12:20 ` Hal Feng
2023-02-17 13:32 ` Conor Dooley
2023-02-17 15:47 ` Krzysztof Kozlowski
2023-02-17 16:27 ` Conor Dooley [this message]
2023-02-18 10:20 ` Krzysztof Kozlowski
2023-02-18 11:17 ` Conor Dooley
2023-02-18 14:55 ` Krzysztof Kozlowski
2023-02-18 15:08 ` Conor Dooley
2023-02-21 22:17 ` Stephen Boyd
2023-02-21 23:39 ` Conor Dooley
2023-02-22 13:27 ` Hal Feng
2023-02-22 16:26 ` Conor Dooley
2023-02-23 3:03 ` Hal Feng
2023-02-23 6:18 ` Conor Dooley
2023-02-23 9:52 ` Hal Feng
2022-12-20 0:50 ` [PATCH v3 08/11] dt-bindings: clock: Add StarFive JH7110 always-on " Hal Feng
2022-12-20 20:14 ` Rob Herring
2022-12-20 23:19 ` Conor Dooley
2023-02-16 17:19 ` Hal Feng
2022-12-20 0:50 ` [PATCH v3 09/11] clk: starfive: Add StarFive JH7110 system clock driver Hal Feng
2022-12-23 9:57 ` kernel test robot
2023-01-05 11:32 ` kernel test robot
2023-02-19 21:23 ` Emil Renner Berthing
2023-02-21 6:44 ` Hal Feng
2022-12-20 0:50 ` [PATCH v3 10/11] clk: starfive: Add StarFive JH7110 always-on " Hal Feng
2022-12-23 11:28 ` kernel test robot
2023-01-05 13:44 ` kernel test robot
2022-12-20 0:50 ` [PATCH v3 11/11] reset: starfive: Add StarFive JH7110 reset driver Hal Feng
2022-12-20 7:14 ` kernel test robot
2022-12-23 12:39 ` kernel test robot
2022-12-27 19:20 ` kernel test robot
2023-01-05 15:35 ` kernel test robot
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