From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ryan Mallon <rmallon-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH v4 09/10] pwm: Add PXA support
Date: Thu, 15 Mar 2012 11:13:46 +1100
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References: <1331740593-10807-1-git-send-email-thierry.reding@avionic-design.de> <1331740593-10807-10-git-send-email-thierry.reding@avionic-design.de>
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To: Thierry Reding <thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Sascha Hauer <s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>, Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>, Matthias Kaehlcke <matthias-RprLehDfhQ3k1uMJSBkQmQ@public.gmane.org>, Kurt Van Dijck <kurt.van.dijck-/BeEPy95v10@public.gmane.org>, Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>, Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>, Colin Cross <ccross-z5hGa2qSFaRBDgjK7y7TUQ@public.gmane.org>, Olof Johansson <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org>, Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>, Richard Purdie <rpurdie-Fm38FmjxZ/leoWH0uzbU5w@public.gmane.org>, Mark Brown <broonie-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org>, Mitch Bradley <wmb-D5eQfiDGL7eakBO8gow8eQ@public.gmane.org>, Mike Frysinger <vapier-aBrp7R+bbdUdnm+yROfE0A@public.gmane.org>, Eric Miao <eric.y.miao-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Lars-Peter Clausen <lars-Qo5EllUWu/uELgA04lAiVw@public.gmane.org>
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On 15/03/12 02:56, Thierry Reding wrote:

> Signed-off-by: Thierry Reding <thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
> ---
> Changes in v3:
>   - update PWM ops for changes in patch 2

Couple of quick notes, mostly for future work.

> +	/* NOTE: the clock to PWM has to be enabled first
> +	 * before writing to the registers
> +	 */
> +	clk_enable(pc->clk);


Should be fixed to also call clk_prepare (and clk_unprepare after
clk_disable). Could be done in a follow up patch.

> +	__raw_writel(prescale, pc->mmio_base + offset + PWMCR);
> +	__raw_writel(dc, pc->mmio_base + offset + PWMDCR);
> +	__raw_writel(pv, pc->mmio_base + offset + PWMPCR);


Should we fix this driver to use readl/writel instead of the __raw
variants? The memory is properly ioremaped, and to my understanding the
__raw memory accessors should be avoided outside of core code. This
could be done in a follow up patch if you want to keep this patch as
mostly just a move of the code.

~Ryan