linux-kernel - Re: [PATCH v1 7/7] clk: qcom: Add video clock controller driver for SC7180

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Date:   Fri, 15 Nov 2019 13:41:31 +0530
From:   Taniya Das <tdas@...eaurora.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Gross <agross@...nel.org>, devicetree@...r.kernel.org,
        robh@...nel.org, robh+dt@...nel.org
Subject: Re: [PATCH v1 7/7] clk: qcom: Add video clock controller driver for
 SC7180

Hi Stephen,

Thanks for the review.

On 11/6/2019 6:09 AM, Stephen Boyd wrote:
> Quoting Taniya Das (2019-10-31 05:21:13)
>> diff --git a/drivers/clk/qcom/videocc-sc7180.c b/drivers/clk/qcom/videocc-sc7180.c
>> new file mode 100644
>> index 0000000..bef034b
>> --- /dev/null
>> +++ b/drivers/clk/qcom/videocc-sc7180.c
>> @@ -0,0 +1,263 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright (c) 2019, The Linux Foundation. All rights reserved.
>> + */
>> +
>> +#include <linux/clk-provider.h>
>> +#include <linux/err.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
> 
> Are these of includes used?
> 

I will clean them up.

>> +#include <linux/regmap.h>
>> +
>> +#include <dt-bindings/clock/qcom,videocc-sc7180.h>
>> +
>> +#include "clk-alpha-pll.h"
>> +#include "clk-branch.h"
>> +#include "clk-rcg.h"
>> +#include "clk-regmap.h"
>> +#include "common.h"
>> +#include "gdsc.h"
>> +
>> +enum {
>> +       P_BI_TCXO,
>> +       P_CHIP_SLEEP_CLK,
>> +       P_CORE_BI_PLL_TEST_SE,
>> +       P_VIDEO_PLL0_OUT_EVEN,
>> +       P_VIDEO_PLL0_OUT_MAIN,
>> +       P_VIDEO_PLL0_OUT_ODD,
>> +};
>> +
>> +static struct pll_vco fabia_vco[] = {
> 
> const?
> 

yes, will add it.

>> +       { 249600000, 2000000000, 0 },
>> +};
>> +
> [...]
>> +
>> +static int video_cc_sc7180_probe(struct platform_device *pdev)
>> +{
>> +       struct regmap *regmap;
>> +       struct alpha_pll_config video_pll0_config = {};
>> +
>> +       regmap = qcom_cc_map(pdev, &video_cc_sc7180_desc);
>> +       if (IS_ERR(regmap))
>> +               return PTR_ERR(regmap);
>> +
>> +       video_pll0_config.l = 0x1F;
> 
> lowercase hex please.
> 
>> +       video_pll0_config.alpha = 0x4000;
>> +       video_pll0_config.user_ctl_val = 0x00000001;
>> +       video_pll0_config.user_ctl_hi_val = 0x00004805;
> 
> Same question, why on stack?
> 

Will update the same.

>> +
>> +       clk_fabia_pll_configure(&video_pll0, regmap, &video_pll0_config);
>> +
>> +       /* video_cc_xo_clk */
> 
> What are we doing? Enabling it?
> 

yes, enabling it. Did not model and mark it CRITICAL.

>> +       regmap_update_bits(regmap, 0x984, 0x1, 0x1);
>> +
>> +       return qcom_cc_really_probe(pdev, &video_cc_sc7180_desc, regmap);
>> +}
>> +
>> +static struct platform_driver video_cc_sc7180_driver = {
>> +       .probe = video_cc_sc7180_probe,
>> +       .driver = {
>> +               .name = "sc7180-videocc",
>> +               .of_match_table = video_cc_sc7180_match_table,
>> +       },
>> +};
>> +
>> +static int __init video_cc_sc7180_init(void)
>> +{
>> +       return platform_driver_register(&video_cc_sc7180_driver);
>> +}
>> +core_initcall(video_cc_sc7180_init);
>> +
>> +static void __exit video_cc_sc7180_exit(void)
>> +{
>> +       platform_driver_unregister(&video_cc_sc7180_driver);
>> +}
>> +module_exit(video_cc_sc7180_exit);
> 
> Same question, module platform driver perhaps?
> 

I will move it to subsys_initcall().

-- 
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