linux-kernel - RE: [PATCH 1/8] PWMSS: Add PWM Subsystem driver for parent<->child relationship

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Date:	Tue, 6 Nov 2012 06:35:24 +0000
From:	"Bedia, Vaibhav" <vaibhav.bedia@...com>
To:	"Philip, Avinash" <avinashphilip@...com>,
	"thierry.reding@...onic-design.de" <thierry.reding@...onic-design.de>,
	"paul@...an.com" <paul@...an.com>,
	"tony@...mide.com" <tony@...mide.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"Cousson, Benoit" <b-cousson@...com>
CC:	Rob Landley <rob@...dley.net>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"Nori, Sekhar" <nsekhar@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Hiremath, Vaibhav" <hvaibhav@...com>,
	"Hebbar, Gururaja" <gururaja.hebbar@...com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	"AnilKumar, Chimata" <anilkumar@...com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 1/8] PWMSS: Add PWM Subsystem driver for parent<->child
 relationship

On Mon, Nov 05, 2012 at 14:42:22, Philip, Avinash wrote:
[...]
> +pwmss0: pwmss@...00000 {
> +	compatible = "ti,am33xx-pwmss";
> +	reg = <0x48300000 0x10
> +		0x48300100 0x80
> +		0x48300180 0x80
> +		0x48300200 0x80>;
Do you really need the 4 address ranges here? You eventually do add in
child nodes with other address ranges so isn't the first entry sufficient?
I haven't really looked at the DT details so it is enforced by that let me
know.

[...]
> +
> +#define PWMSS_CLKCONFIG		8
> +

This #def can use a comment.

> +void pwmss_submodule_state_change(struct device *dev, int pos, bool enable)
> +{
> +	struct pwmss_info *info = dev_get_drvdata(dev);
> +	u16 val;
> +
> +	val = readw(info->mmio_base + PWMSS_CLKCONFIG);
> +	if (enable)
> +		val |= 1 << pos;
> +	else
> +		val &= ~(1 << pos);
> +	mutex_lock(&info->pwmss_lock);
> +	writew(val , info->mmio_base + PWMSS_CLKCONFIG);
> +	mutex_unlock(&info->pwmss_lock);
> +}
> +EXPORT_SYMBOL(pwmss_submodule_state_change);

I see a clk_en_ack field in the clock status register. You should be checking that.

[...]

> +
> +MODULE_DESCRIPTION("pwmss driver");
> +MODULE_AUTHOR("Texas Instruments");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/pwm/tipwmss.h b/drivers/pwm/tipwmss.h
> new file mode 100644
> index 0000000..83fdc29
> --- /dev/null
> +++ b/drivers/pwm/tipwmss.h
> @@ -0,0 +1,8 @@

License text?
 
> +#ifdef CONFIG_PWM_TIPWMSS
> +extern void pwmss_submodule_state_change(struct device *dev, int pos,
> +		bool enable);
> +#else
> +static inline void pwmss_submodule_state_change(struct device *dev, int pos,
> +		bool enable)
> +{}
> +#endif

Regards,
Vaibhav
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