linux-kernel - Re: [PATCH v1 5/5] regmap: mmio: Introduce IO accessors that can talk to IO port

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Date:   Mon, 8 Aug 2022 14:18:21 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Aidan MacDonald <aidanmacdonald.0x0@...il.com>,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v1 5/5] regmap: mmio: Introduce IO accessors that can
 talk to IO port

On Fri, Aug 05, 2022 at 11:53:21PM +0300, Andy Shevchenko wrote:

> Currently regmap MMIO is inconsistent with IO accessors. I.e.
> the Big Endian counterparts are using ioreadXXbe() / iowriteXXbe()
> which are not clean implementations of readXXbe(). Besides that
> some users may use regmap MMIO for IO ports, and this can be done
> by assigning ioreadXX()/iowriteXX() and their Big Endian counterparts
> to the regmap context.

Have you validated that nothing is relying on whatever the problem is
with using the io versions?

> That said, reimplement current Big Endian MMIO accessors by replacing
> ioread()/iowrite() with respective read()/write() and swab() calls.
> While at it, add IO port support with a corresponding flag added.

This should be a separate patch.

> +			if (config->io_port) {
> +				ctx->reg_read = regmap_mmio_ioread8;
> +				ctx->reg_write = regmap_mmio_iowrite8;
> +			} else if (config->use_relaxed_mmio) {

If these options are mutually exclusive we should validate that they are
not simultaneously set.

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