linux-kernel - Re: [PATCH V3 2/4] soc: qcom: dcc:Add driver support for Data Capture and Compare unit(DCC)

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Message-ID: <ffc2076e7145af0099bab8ef37611556@codeaurora.org>
Date:   Mon, 19 Apr 2021 16:02:19 +0530
From:   schowdhu@...eaurora.org
To:     Felipe Balbi <balbi@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Sibi Sankar <sibis@...eaurora.org>,
        Rajendra Nayak <rnayak@...eaurora.org>, vkoul@...nel.org
Subject: Re: [PATCH V3 2/4] soc: qcom: dcc:Add driver support for Data Capture
 and Compare unit(DCC)

On 2021-04-15 12:01, Felipe Balbi wrote:
> Hi,
> 
> Souradeep Chowdhury <schowdhu@...eaurora.org> writes:
>> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
>> index ad675a6..e7f0ccb 100644
>> --- a/drivers/soc/qcom/Makefile
>> +++ b/drivers/soc/qcom/Makefile
>> @@ -1,19 +1,22 @@
>>  # SPDX-License-Identifier: GPL-2.0
>>  CFLAGS_rpmh-rsc.o := -I$(src)
>>  obj-$(CONFIG_QCOM_AOSS_QMP) +=	qcom_aoss.o
>> -obj-$(CONFIG_QCOM_GENI_SE) +=	qcom-geni-se.o
>> +obj-$(CONFIG_QCOM_APR) += apr.o
>>  obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o
>>  obj-$(CONFIG_QCOM_CPR)		+= cpr.o
>> +obj-$(CONFIG_QCOM_DCC) += dcc.o
>> +obj-$(CONFIG_QCOM_GENI_SE) +=   qcom-geni-se.o
>>  obj-$(CONFIG_QCOM_GSBI)	+=	qcom_gsbi.o
>> +obj-$(CONFIG_QCOM_KRYO_L2_ACCESSORS) += kryo-l2-accessors.o
>> +obj-$(CONFIG_QCOM_LLCC) += llcc-qcom.o
>>  obj-$(CONFIG_QCOM_MDT_LOADER)	+= mdt_loader.o
>>  obj-$(CONFIG_QCOM_OCMEM)	+= ocmem.o
>>  obj-$(CONFIG_QCOM_PDR_HELPERS)	+= pdr_interface.o
>>  obj-$(CONFIG_QCOM_QMI_HELPERS)	+= qmi_helpers.o
>> -qmi_helpers-y	+= qmi_encdec.o qmi_interface.o
>>  obj-$(CONFIG_QCOM_RMTFS_MEM)	+= rmtfs_mem.o
>>  obj-$(CONFIG_QCOM_RPMH)		+= qcom_rpmh.o
>> -qcom_rpmh-y			+= rpmh-rsc.o
>> -qcom_rpmh-y			+= rpmh.o
>> +obj-$(CONFIG_QCOM_RPMHPD) += rpmhpd.o
>> +obj-$(CONFIG_QCOM_RPMPD) += rpmpd.o
>>  obj-$(CONFIG_QCOM_SMD_RPM)	+= smd-rpm.o
>>  obj-$(CONFIG_QCOM_SMEM) +=	smem.o
>>  obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
>> @@ -21,8 +24,6 @@ obj-$(CONFIG_QCOM_SMP2P)	+= smp2p.o
>>  obj-$(CONFIG_QCOM_SMSM)	+= smsm.o
>>  obj-$(CONFIG_QCOM_SOCINFO)	+= socinfo.o
>>  obj-$(CONFIG_QCOM_WCNSS_CTRL) += wcnss_ctrl.o
>> -obj-$(CONFIG_QCOM_APR) += apr.o
>> -obj-$(CONFIG_QCOM_LLCC) += llcc-qcom.o
>> -obj-$(CONFIG_QCOM_RPMHPD) += rpmhpd.o
>> -obj-$(CONFIG_QCOM_RPMPD) += rpmpd.o
>> -obj-$(CONFIG_QCOM_KRYO_L2_ACCESSORS) +=	kryo-l2-accessors.o
>> +qmi_helpers-y   += qmi_encdec.o qmi_interface.o
>> +qcom_rpmh-y                     += rpmh-rsc.o
>> +qcom_rpmh-y                     += rpmh.o
> 
> why so many changes?

This has been accidentally sorted based on the config names. Will be 
fixing this in next version of the patch.

> 
>> diff --git a/drivers/soc/qcom/dcc.c b/drivers/soc/qcom/dcc.c
>> new file mode 100644
>> index 0000000..fcd5580
>> --- /dev/null
>> +++ b/drivers/soc/qcom/dcc.c
>> @@ -0,0 +1,1539 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright (c) 2015-2021, The Linux Foundation. All rights 
>> reserved.
>> + */
>> +
>> +#include <linux/bitfield.h>
>> +#include <linux/bitops.h>
>> +#include <linux/cdev.h>
>> +#include <linux/delay.h>
>> +#include <linux/fs.h>
>> +#include <linux/io.h>
>> +#include <linux/iopoll.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/slab.h>
>> +#include <linux/uaccess.h>
>> +
>> +
> 
> one blank line is enough

Ack

> 
>> +#define TIMEOUT_US		100
>> +
>> +#define dcc_writel(drvdata, val, off)					\
>> +	writel((val), drvdata->base + dcc_offset_conv(drvdata, off))
>> +#define dcc_readl(drvdata, off)						\
>> +	readl(drvdata->base + dcc_offset_conv(drvdata, off))
>> +
>> +#define dcc_sram_readl(drvdata, off)					\
>> +	readl(drvdata->ram_base + off)
> 
> this would be probably be better as static inlines.

These are simple read and write operations used in the driver
which just calls the generic writel and readl function.
That's why macros have been used here to lesson the overhead
of an extra function call.