linux-kernel - Re: [PATCH v3 2/7] ARM: bcm2835: Add a Raspberry Pi-specific clock driver.

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Message-ID: <557647B7.2030302@wwwdotorg.org>
Date:	Mon, 08 Jun 2015 19:56:07 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Eric Anholt <eric@...olt.net>
CC:	linux-arm-kernel@...ts.infradead.org,
	linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Lee Jones <lee@...nel.org>, linux-clk@...r.kernel.org,
	Stephen Boyd <sboyd@...eaurora.org>,
	Mike Turquette <mturquette@...aro.org>
Subject: Re: [PATCH v3 2/7] ARM: bcm2835: Add a Raspberry Pi-specific clock
 driver.

On 06/08/2015 05:58 PM, Eric Anholt wrote:
> Unfortunately, the clock manager's registers are not accessible by the
> ARM, so we have to request that the firmware modify our clocks for us.
> 
> This driver only registers the clocks at the point they are requested
> by a client driver.  This is partially to support returning
> -EPROBE_DEFER when the firmware driver isn't supported yet, but it
> also avoids issues with disabling "unused" clocks due to them not yet
> being connected to their consumers in the DT.

> diff --git a/drivers/clk/clk-raspberrypi.c b/drivers/clk/clk-raspberrypi.c

> +static int rpi_clk_set_state(struct clk_hw *hw, bool on)

> +	if (ret || (packet[1] & (1 << 1))) {

A #define for the shift amount would be nice, so that this statement was
a bit more semantic.

Aside from that, the series,
Acked-by: Stephen Warren <swarren@...dotorg.org>
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