linux-kernel - Re: [PATCH 07/12] hwrng: bcm2835-rng: Manage an optional clock

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Message-ID: <20171104201721.GA1394@lunn.ch>
Date:   Sat, 4 Nov 2017 21:17:21 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     Stefan Wahren <stefan.wahren@...e.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Sean Wang <sean.wang@...iatek.com>,
        Martin Kaiser <martin@...ser.cx>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Scott Branden <sbranden@...adcom.com>,
        Ray Jui <rjui@...adcom.com>, Matt Mackall <mpm@...enic.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-kernel@...r.kernel.org, Eric Anholt <eric@...olt.net>,
        Harald Freudenberger <freude@...ux.vnet.ibm.com>,
        Rob Herring <robh+dt@...nel.org>,
        "maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
        <bcm-kernel-feedback-list@...adcom.com>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>,
        PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>,
        Steffen Trumtrar <s.trumtrar@...gutronix.de>,
        "moderated list:BROADCOM BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>
Subject: Re: [PATCH 07/12] hwrng: bcm2835-rng: Manage an optional clock

> The clk API outside of DT doesn't have knowledge of when it's "complete"
> to be able to determine whether the clock is not present or temporarily
> missing.  I've already NAK'd this suggestion.

Hi Russell

O.K, yes, makes sense.

We do have of_clk_get_by_name() and of_clk_get(). Would optional
variants of these be acceptable?

	 Andrew