linux-kernel - Re: [PATCH v3] clocksource: Add driver for the Ingenic JZ47xx OST

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Date:   Wed, 15 Jan 2020 18:48:57 +0100
From:   Maarten ter Huurne <maarten@...ewalker.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Paul Cercueil <paul@...pouillou.net>
Cc:     Thomas Gleixner <tglx@...utronix.de>, od@...c.me,
        linux-kernel@...r.kernel.org, Mathieu Malaterre <malat@...ian.org>,
        Artur Rojek <contact@...ur-rojek.eu>
Subject: Re: [PATCH v3] clocksource: Add driver for the Ingenic JZ47xx OST

On Wednesday, 15 January 2020 14:57:01 CET Paul Cercueil wrote:
> Le mer., janv. 15, 2020 at 14:44, Daniel Lezcano
> <daniel.lezcano@...aro.org> a écrit :
> > Is the JZ47xx OST really a mfd needing a regmap? (Note regmap_read
> > will take a lock).
> 
> Yes, the TCU_REG_OST_TCSR register is shared with the clocks driver.

The TCU_REG_OST_TCSR register is only used in the probe though.

To get the counter value from TCU_REG_OST_CNTL/TCU_REG_OST_CNTH you 
could technically do it by reading the register directly, if performance 
concerns make it necessary to bypass the usual kernel infrastructure for 
dealing with shared registers.

Bye,
		Maarten