linux-kernel - Re: [PATCH v4 1/8] clk: bcm2835: Add binding docs for the Raspberry Pi clock provider

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Message-ID: <20150811211840.31346.28666@quantum>
Date:	Tue, 11 Aug 2015 14:18:40 -0700
From:	Michael Turquette <mturquette@...aro.org>
To:	Eric Anholt <eric@...olt.net>, linux-arm-kernel@...ts.infradead.org
Cc:	linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	"Stephen Warren" <swarren@...dotorg.org>,
	"Lee Jones" <lee@...nel.org>, linux-clk@...r.kernel.org,
	"Stephen Boyd" <sboyd@...eaurora.org>,
	"Eric Anholt" <eric@...olt.net>
Subject: Re: [PATCH v4 1/8] clk: bcm2835: Add binding docs for the Raspberry Pi clock
 provider

Quoting Eric Anholt (2015-07-20 12:33:00)
> The hardware clocks are not controllable by the ARM, so we have to
> make requests to the firmware to do so from the VPU side.  This will
> let us replace fixed clocks in our DT with actual clock control (and
> correct frequency information).
> 
> Signed-off-by: Eric Anholt <eric@...olt.net>
> Acked-by: Stephen Warren <swarren@...dotorg.org>
> Acked-by: Lee Jones <lee@...nel.org>

Looks good to me. Do you want the clk patches to go through the clk tree
or do you want them all together? For this patch feel free to add:

Acked-by: Michael Turquette <mturquette@...libre.com>

Regards,
Mike

> ---
> 
> v2: Include the dt-bindings header in this commit instead of the next
>     one.  Make the clock indices match the firmware clock IDs.  Rename
>     the binding's compat string.  Move the firmware phandle to be
>     under a vendor-specific namespace.
> v4: Mention 'clk' in the subject instead of the more generic
>     dt/bindings.
> 
>  .../clock/raspberrypi,bcm2835-firmware-clocks.txt  | 25 ++++++++++++++++++++++
>  include/dt-bindings/clk/raspberrypi.h              | 23 ++++++++++++++++++++
>  2 files changed, 48 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/raspberrypi,bcm2835-firmware-clocks.txt
>  create mode 100644 include/dt-bindings/clk/raspberrypi.h
> 
> diff --git a/Documentation/devicetree/bindings/clock/raspberrypi,bcm2835-firmware-clocks.txt b/Documentation/devicetree/bindings/clock/raspberrypi,bcm2835-firmware-clocks.txt
> new file mode 100644
> index 0000000..0972602
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/raspberrypi,bcm2835-firmware-clocks.txt
> @@ -0,0 +1,25 @@
> +Raspberry Pi firmware clock provider.
> +
> +The Raspberry Pi architecture doesn't provide direct access to the
> +CLOCKMAN peripheral from the ARM side, so Linux has to make requests
> +to the VPU firmware to program them.
> +
> +This binding uses the common clock binding:
> +Documentation/devicetree/bindings/clock/clock-bindings.txt
> +
> +Required properties:
> +- compatible:          Should be "raspberrypi,bcm2835-firmware-clocks"
> +
> +- #clock-cells:                Shall have value <1>.  The permitted clock-specifier
> +                         values can be found in
> +                         include/dt-bindings/clk/raspberrypi.h.
> +
> +- raspberrypi,firmware:        Phandle to the firmware driver node.
> +
> +Example:
> +
> +firmware_clocks: firmware-clocks {
> +       compatible = "raspberrypi,bcm2835-firmware-clocks";
> +       #clock-cells = <1>;
> +       raspberrypi,firmware = <&firmware>;
> +};
> diff --git a/include/dt-bindings/clk/raspberrypi.h b/include/dt-bindings/clk/raspberrypi.h
> new file mode 100644
> index 0000000..ceec90f
> --- /dev/null
> +++ b/include/dt-bindings/clk/raspberrypi.h
> @@ -0,0 +1,23 @@
> +#/*
> + *  Copyright �� 2015 Broadcom
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef _DT_BINDINGS_CLK_RASPBERRYPI_H
> +#define _DT_BINDINGS_CLK_RASPBERRYPI_H
> +
> +#define RPI_CLOCK_EMMC 1
> +#define RPI_CLOCK_UART0        2
> +#define RPI_CLOCK_ARM  3
> +#define RPI_CLOCK_CORE 4
> +#define RPI_CLOCK_V3D  5
> +#define RPI_CLOCK_H264 6
> +#define RPI_CLOCK_ISP  7
> +#define RPI_CLOCK_SDRAM        8
> +#define RPI_CLOCK_PIXEL        9
> +#define RPI_CLOCK_PWM  10
> +
> +#endif
> -- 
> 2.1.4
> 
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