linux-kernel - Re: [PATCH 2/7] dt-bindings: pwm: Add a new binding for rockchip,rk3576-pwm

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Message-ID: <20250408-drivable-hypnotize-062fd7cec903@spud>
Date: Tue, 8 Apr 2025 17:07:52 +0100
From: Conor Dooley <conor@...nel.org>
To: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Uwe Kleine-König <ukleinek@...nel.org>,
	William Breathitt Gray <wbg@...nel.org>,
	Sebastian Reichel <sebastian.reichel@...labora.com>,
	Kever Yang <kever.yang@...k-chips.com>, linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-pwm@...r.kernel.org, linux-iio@...r.kernel.org,
	kernel@...labora.com, Jonas Karlman <jonas@...boo.se>,
	Detlev Casanova <detlev.casanova@...labora.com>
Subject: Re: [PATCH 2/7] dt-bindings: pwm: Add a new binding for
 rockchip,rk3576-pwm

On Tue, Apr 08, 2025 at 02:32:14PM +0200, Nicolas Frattaroli wrote:
> The Rockchip RK3576 SoC has a newer PWM controller IP revision than
> previous Rockchip SoCs. This IP, called "PWMv4" by Rockchip, introduces
> several new features, and consequently differs in its bindings.
> 
> Instead of expanding the ever-growing rockchip-pwm binding that already
> has an if-condition, add an entirely new binding to handle this.
> 
> The "osc" clock is an optional clock available on some instances of the
> PWM controller. If present, it allows the controller to switch between
> either the "pwm" clock or the "osc" clock for deriving its PWM signal
> on a per-channel basis, through a hardware register write.
> 
> However, not all instances have this feature, and the hardware copes
> just fine without this additional clock, so it's optional.
> 
> The PWM controller also comes with an interrupt now. This interrupt is
> used to signal various conditions.
> 
> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>

Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

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