linux-kernel - Re: [RFC PATCH v3 2/3] regmap-irq: Add support for POLARITY_HI and POLARITY

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Date:   Mon, 15 Mar 2021 13:36:08 -0700
From:   Guru Das Srinagesh <gurus@...eaurora.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     Markus Elfring <Markus.Elfring@....de>,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Joe Perches <joe@...ches.com>,
        Subbaraman Narayanamurthy <subbaram@...eaurora.org>,
        David Collins <collinsd@...eaurora.org>,
        Anirudh Ghayal <aghayal@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [RFC PATCH v3 2/3] regmap-irq: Add support for POLARITY_HI and
 POLARITY_LO config regs

On Mon, Mar 15, 2021 at 01:33:36PM -0700, Guru Das Srinagesh wrote:
> On Fri, Mar 12, 2021 at 12:19:16PM +0000, Mark Brown wrote:
> > On Wed, Mar 10, 2021 at 04:39:53PM -0800, Guru Das Srinagesh wrote:
> > > If an interrupt is already configured as either edge- or
> > > level-triggered, setting the corresponding bit for it in the POLARITY_HI
> > > register further configures it as rising-edge or level-high triggered
> > > (as the case may be), while setting the same bit in POLARITY_LO further
> > > configures it as falling-edge or level-low triggered.
> > 
> > I think you probably need to bring these three fields together into a
> > single virtual field and then map the values within that field using
> > the existing type stuff.
> 
> Sure, how about this scheme then, for patches 2 and 3 in this series?
> (Patch 1 will remain the same, pending your review of it.)
> 
> Since I do need to write to two extra registers, I'll need two
> register_base's and two buffers to hold their data. This can be
> generalized to "extra config registers" in the framework as follows:
> 
> - Add these two fields to `struct regmap_irq_chip`:
> 
> 	unsigned int *extra_config_base; /* Points to array of extra regs */
> 	int num_extra_config_regs;	 /* = ARRAY_SIZE(array above) */
> 
> - Add this field to `struct regmap_irq_chip_data`:
> 
> 	unsigned int **extra_config_buf;
>   	/* Will be dynamically allocated to size of:
>   	 * [chip->num_extra_config_regs][chip->num_regs]
>   	 */
> 
> - Add a new function callback in `struct regmap_irq_chip`:
> 
> 	int (*configure_extra_regs)(void *irq_drv_data, unsigned int
> 	type)
> 
>   This callback will be called at the end of regmap_irq_set_type():
>   	
>   	if (d->chip->configure_extra_regs)
> 		d->chip->configure_extra_regs();
> 
>   The callback, defined in the client driver, will specifically address
>   the changes to regmap_irq_set_type() made in patches 2 and 3 of this
>   series, viz. overriding how type_buf is to be handled, plus the
>   populating of polarity_*_buf's (rechristened as extra_config_bufs in
>   this proposed new scheme).
> 
> This new scheme thus makes v2 more generic. I thought I'd discuss this
> with you before implementing it as v3 RFC. Could you please let me know
> your thoughts?

Typo. I meant:

This new scheme thus makes *v3* more generic. I thought I'd discuss this
with you before implementing it as *v4* RFC. 

Guru Das.