linux-kernel - Re: [PATCH 1/4] iio: adc: rockchip_saradc: reset saradc controller before programming it

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Date:	Tue, 26 Jul 2016 11:17:34 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Caesar Wang <wxt@...k-chips.com>
Cc:	jic23@...nel.org, robh+dt@...nel.org, linux-iio@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux@...ck-us.net,
	dianders@...omium.org
Subject: Re: [PATCH 1/4] iio: adc: rockchip_saradc: reset saradc controller before programming it

Am Dienstag, 26. Juli 2016, 14:11:47 schrieb Caesar Wang:
> SARADC controller needs to be reset before programming it, otherwise
> it will not function properly.
> 
> Signed-off-by: Caesar Wang <wxt@...k-chips.com>
> Cc: Jonathan Cameron <jic23@...nel.org>
> Cc: Heiko Stuebner <heiko@...ech.de>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: linux-iio@...r.kernel.org
> Cc: linux-rockchip@...ts.infradead.org
> ---
> 
>  .../bindings/iio/adc/rockchip-saradc.txt           |  5 +++++
>  drivers/iio/adc/Kconfig                            |  1 +
>  drivers/iio/adc/rockchip_saradc.c                  | 22
> ++++++++++++++++++++++ 3 files changed, 28 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt
> b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt index
> bf99e2f..d2258be 100644
> --- a/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt
> +++ b/Documentation/devicetree/bindings/iio/adc/rockchip-saradc.txt
> @@ -13,6 +13,9 @@ Required properties:
>  - clocks: Must contain an entry for each entry in clock-names.
>  - clock-names: Shall be "saradc" for the converter-clock, and "apb_pclk"
> for the peripheral clock.
> +- resets: Must contain an entry for each entry in reset-names.
> +	  See ../reset/reset.txt for details.
> +- reset-names: Must include the name "saradc-apb".

as pointed out by John, this should be an optional property, as it should work 
with old devicetrees as well.