linux-kernel - Re: [PATCH v4 1/5] i2c: hpe: Add GXP SoC I2C Controller

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Date:   Thu, 16 Feb 2023 20:02:41 +0000
From:   "Hawkins, Nick" <nick.hawkins@....com>
To:     Wolfram Sang <wsa@...nel.org>
CC:     "Verdun, Jean-Marie" <verdun@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "joel@....id.au" <joel@....id.au>
Subject: Re: [PATCH v4 1/5] i2c: hpe: Add GXP SoC I2C Controller

> Does it make sense to have #defines for the magic values for I2CSCMD?
> BTW, is the datasheet public?

I will work on the defines and get rid of all the magic values.
Unfortunately, there is no public spec available currently.
Hopefully, we will have one someday though.

> > + /* Use physical memory address to determine which I2C engine this is. */
> > + drvdata->engine = ((u32)drvdata->base & 0xf00) >> 8;


> This breaks on my 64-bit test-build, so it will also fail with
> COMPILE_TEST.


> drivers/i2c/busses/i2c-gxp.c: In function ‘gxp_i2c_probe’:
> drivers/i2c/busses/i2c-gxp.c:533:28: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
> 533 | drvdata->engine = ((u32)drvdata->base & 0xf00) >> 8;

I am currently unable to reproduce this error. I even set W=2.
Would replacing (u32) with (unsigned long) resolve it?

Thanks,

-Nick Hawkins