From: lars@metafoo•de (Lars-Peter Clausen)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v2 02/10] pwm: Allow chips to support multiple PWMs.
Date: Mon, 06 Feb 2012 22:22:49 +0100 [thread overview]
Message-ID: <4F3044A9.8000202@metafoo.de> (raw)
In-Reply-To: <1328541585-24642-3-git-send-email-thierry.reding@avionic-design.de>
On 02/06/2012 04:19 PM, Thierry Reding wrote:
> This commit modifies the PWM core to support multiple PWMs per struct
> pwm_chip.
I think you should mention what motivates this change.
> It achieves this in a similar way to how gpiolib works, by
> allowing PWM ranges to be requested dynamically (pwm_chip.base == -1) or
> starting at a given offset (pwm_chip.base >= 0).
If we've learned one thing from gpiolib, I think it is that using a global
index to identify a resource was a bad idea.
> A chip specifies how
> many PWMs it controls using the npwm member. Each of the functions in
> the pwm_ops structure gets an additional argument that specified the PWM
> number (it can be converted to a per-chip index by subtracting the
> chip's base).
>
> The total maximum number of PWM devices is currently fixed to 64, but
> can easily be made configurable via Kconfig.
The code says 1024.
>
> The patch is incomplete in that it doesn't convert any existing drivers
> that are now broken.
next prev parent reply other threads:[~2012-02-06 21:22 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-06 15:19 [PATCH v2 00/10] Add PWM framework and device-tree support Thierry Reding
2012-02-06 15:19 ` [PATCH v2 01/10] PWM: add pwm framework support Thierry Reding
2012-02-06 15:19 ` [PATCH v2 02/10] pwm: Allow chips to support multiple PWMs Thierry Reding
2012-02-06 21:22 ` Lars-Peter Clausen [this message]
2012-02-07 7:04 ` Thierry Reding
2012-02-07 11:38 ` Mark Brown
2012-02-08 9:13 ` Russell King - ARM Linux
2012-02-08 11:12 ` Thierry Reding
2012-02-07 22:53 ` Ryan Mallon
2012-02-08 8:15 ` Thierry Reding
2012-02-08 9:00 ` Sascha Hauer
2012-02-08 11:16 ` Thierry Reding
2012-02-08 9:17 ` Russell King - ARM Linux
2012-02-08 10:31 ` Thierry Reding
2012-02-06 15:19 ` [PATCH v2 03/10] of: Add PWM support Thierry Reding
2012-02-06 15:19 ` [PATCH v2 04/10] arm/tegra: Fix PWM clock programming Thierry Reding
2012-02-06 15:19 ` [PATCH v2 05/10] arm/tegra: Provide clock for only one PWM controller Thierry Reding
2012-02-06 15:19 ` [PATCH v2 06/10] pwm: Add NVIDIA Tegra SoC support Thierry Reding
2012-02-06 15:19 ` [PATCH v2 07/10] arm/tegra: Add PWFM controller device tree probing Thierry Reding
2012-02-06 15:19 ` [PATCH v2 08/10] pwm: Add Blackfin support Thierry Reding
2012-02-06 15:19 ` [PATCH v2 09/10] pwm: Add PXA support Thierry Reding
2012-02-06 15:19 ` [PATCH v2 10/10] pwm-backlight: Add rudimentary device tree support Thierry Reding
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