linux-kernel - Re: [Patch v6 6/7] regmap: add SLIMBUS support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20171007050242.4smp3x2rqkwxvg5h@latitude>
Date:   Sat, 7 Oct 2017 07:02:42 +0200
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     srinivas.kandagatla@...aro.org
Cc:     gregkh@...uxfoundation.org, broonie@...nel.org,
        alsa-devel@...a-project.org, sdharia@...eaurora.org, bp@...e.de,
        poeschel@...onage.de, treding@...dia.com,
        gong.chen@...ux.intel.com, andreas.noever@...il.com,
        alan@...ux.intel.com, mathieu.poirier@...aro.org, daniel@...ll.ch,
        jkosina@...e.cz, sharon.dvir1@...l.huji.ac.il, joe@...ches.com,
        davem@...emloft.net, james.hogan@...tec.com,
        michael.opdenacker@...e-electrons.com, robh+dt@...nel.org,
        pawel.moll@....com, mark.rutland@....com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        kheitke@...ience.com, linux-arm-msm@...r.kernel.org, arnd@...db.de
Subject: Re: [Patch v6 6/7] regmap: add SLIMBUS support

Hi,

On Fri, Oct 06, 2017 at 05:51:35PM +0200, srinivas.kandagatla@...aro.org wrote:
> From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> 
> This patch adds support to read/write slimbus value elements.
> Currently it only supports byte read/write. Adding this support in
> regmap would give codec drivers more flexibility when there are more
> than 2 control interfaces like slimbus, i2c.
> 
> Without this patch each codec driver has to directly call slimbus value
> element apis, and this could would get messy once we want to add i2c
> interface to it.
> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
[...]
> +static int regmap_slimbus_byte_reg_read(void *context, unsigned int reg,
> +					unsigned int *val)
> +{
> +	struct slim_device *slim = context;
> +	struct slim_val_inf msg = {0,};
> +
> +	msg.start_offset = reg;
> +	msg.num_bytes = 1;
> +	msg.rbuf = (void *)val;
> +
> +	return slim_request_val_element(slim, &msg);
> +}

This looks like it won't work on big-endian systems. I know big endian
is pretty uncommon in devices that will likely have SLIMBus, but it's
better to be endian-independent.

> +static int regmap_slimbus_byte_reg_write(void *context, unsigned int reg,
> +					 unsigned int val)
> +{
> +	struct slim_device *slim = context;
> +	struct slim_val_inf msg = {0,};
> +
> +	msg.start_offset = reg;
> +	msg.num_bytes = 1;
> +	msg.wbuf = (void *)&val;
> +
> +	return slim_change_val_element(slim, &msg);
> +}

dito

> +static struct regmap_bus regmap_slimbus_bus = {
> +	.reg_write = regmap_slimbus_byte_reg_write,
> +	.reg_read = regmap_slimbus_byte_reg_read,
> +};


Thanks,
Jonathan Neuschäfer

Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)