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

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Date:   Sat, 7 Oct 2017 11:25:22 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
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

Thanks for the review comments,

On 07/10/17 06:02, Jonathan Neuschäfer wrote:
> 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.

Yep, I agree! will fix it in next version.

> 
>> +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
>