linux-kernel - Re: [PATCH v2 1/1] remoteproc: Add support for xo clock

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Date:   Wed, 2 Nov 2016 11:58:36 -0700
From:   Sarangdhar Joshi <spjoshi@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Stephen Boyd <sboyd@...eaurora.org>,
        Trilok Soni <tsoni@...eaurora.org>
Subject: Re: [PATCH v2 1/1] remoteproc: Add support for xo clock

On 10/31/2016 05:05 PM, Bjorn Andersson wrote:
> On Tue 25 Oct 13:57 PDT 2016, Sarangdhar Joshi wrote:
>
>> Add xo clock support required to boot up Qualcomm ADSP processor.
>> The ADSP remoteproc driver keeps xo clock enabled until the
>> driver receives "handover" irq, in order to allow ADSP processor
>> to vote for xo clock with rpm.
>
> Looks good, thanks.
>
> We have to add the clock to the DT binding and run that by Rob again,
> before merging the driver and this patch.
>
> Regards,
> Bjorn

Sure, will add it to the DT bindings. Thanks for reviewing.

Regards,
Sarang

>
>>
>> Signed-off-by: Sarangdhar Joshi <spjoshi@...eaurora.org>
>> ---
>>  drivers/remoteproc/qcom_adsp_pil.c | 30 +++++++++++++++++++++++++++++-
>>  1 file changed, 29 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/remoteproc/qcom_adsp_pil.c b/drivers/remoteproc/qcom_adsp_pil.c
>> index 9141633..5bb25d1 100644
>> --- a/drivers/remoteproc/qcom_adsp_pil.c
>> +++ b/drivers/remoteproc/qcom_adsp_pil.c
>> @@ -15,6 +15,7 @@
>>   * GNU General Public License for more details.
>>   */
>>
>> +#include <linux/clk.h>
>>  #include <linux/firmware.h>
>>  #include <linux/interrupt.h>
>>  #include <linux/kernel.h>
>> @@ -48,6 +49,8 @@ struct qcom_adsp {
>>  	struct qcom_smem_state *state;
>>  	unsigned stop_bit;
>>
>> +	struct clk *xo;
>> +
>>  	struct regulator *cx_supply;
>>
>>  	struct completion start_done;
>> @@ -102,10 +105,14 @@ static int adsp_start(struct rproc *rproc)
>>  	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
>>  	int ret;
>>
>> -	ret = regulator_enable(adsp->cx_supply);
>> +	ret = clk_prepare_enable(adsp->xo);
>>  	if (ret)
>>  		return ret;
>>
>> +	ret = regulator_enable(adsp->cx_supply);
>> +	if (ret)
>> +		goto disable_clocks;
>> +
>>  	ret = qcom_scm_pas_auth_and_reset(ADSP_PAS_ID);
>>  	if (ret) {
>>  		dev_err(adsp->dev,
>> @@ -126,6 +133,8 @@ static int adsp_start(struct rproc *rproc)
>>
>>  disable_regulators:
>>  	regulator_disable(adsp->cx_supply);
>> +disable_clocks:
>> +	clk_disable_unprepare(adsp->xo);
>>
>>  	return ret;
>>  }
>> @@ -223,6 +232,21 @@ static irqreturn_t adsp_stop_ack_interrupt(int irq, void *dev)
>>  	return IRQ_HANDLED;
>>  }
>>
>> +static int adsp_init_clock(struct qcom_adsp *adsp)
>> +{
>> +	int ret;
>> +
>> +	adsp->xo = devm_clk_get(adsp->dev, "xo");
>> +	if (IS_ERR(adsp->xo)) {
>> +		ret = PTR_ERR(adsp->xo);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(adsp->dev, "failed to get xo clock");
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>>  static int adsp_init_regulator(struct qcom_adsp *adsp)
>>  {
>>  	adsp->cx_supply = devm_regulator_get(adsp->dev, "cx");
>> @@ -320,6 +344,10 @@ static int adsp_probe(struct platform_device *pdev)
>>  	if (ret)
>>  		goto free_rproc;
>>
>> +	ret = adsp_init_clock(adsp);
>> +	if (ret)
>> +		goto free_rproc;
>> +
>>  	ret = adsp_init_regulator(adsp);
>>  	if (ret)
>>  		goto free_rproc;
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
>> a Linux Foundation Collaborative Project
>>


-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project