linux-kernel - Re: [PATCH 1/3] clk: mdm9615: Add support for MDM9615 Clock Controllers

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Message-ID: <576BA676.4040208@baylibre.com>
Date:	Thu, 23 Jun 2016 11:05:58 +0200
From:	Neil Armstrong <narmstrong@...libre.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Michael Turquette <mturquette@...libre.com>,
	Andy Gross <andy.gross@...aro.org>,
	David Brown <david.brown@...aro.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-clk@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] clk: mdm9615: Add support for MDM9615 Clock
 Controllers

On 06/21/2016 03:21 AM, Stephen Boyd wrote:
> On 06/17, Neil Armstrong wrote:
>> In order to support the Qualcomm MDM9615 SoC, add support for
>> the Global and LPASS Clock Controllers.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>>  drivers/clk/qcom/Kconfig       |   17 +
>>  drivers/clk/qcom/Makefile      |    2 +
>>  drivers/clk/qcom/gcc-mdm9615.c | 1709 ++++++++++++++++++++++++++++++++++++++++
>>  drivers/clk/qcom/lcc-mdm9615.c |  580 ++++++++++++++
>>  4 files changed, 2308 insertions(+)
>>  create mode 100644 drivers/clk/qcom/gcc-mdm9615.c
>>  create mode 100644 drivers/clk/qcom/lcc-mdm9615.c
>>
>> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
>> index 95e3b3e..1c05430 100644
>> --- a/drivers/clk/qcom/Kconfig
>> +++ b/drivers/clk/qcom/Kconfig
>> @@ -87,6 +87,23 @@ config MSM_LCC_8960
>>  	  Say Y if you want to use audio devices such as i2s, pcm,
>>  	  SLIMBus, etc.
>>  
>> +config MSM_GCC_9615
> 
> s/MSM/MDM/
> 
>> +	tristate "MDM9615 Global Clock Controller"
>> +	depends on COMMON_CLK_QCOM
>> +	help
>> +	  Support for the global clock controller on mdm9615 devices.
>> +	  Say Y if you want to use peripheral devices such as UART, SPI,
>> +	  i2c, USB, SD/eMMC, etc.
>> +
>> +config MSM_LCC_9615
> 
> s/MSM/MDM/
> 
>> +	tristate "MDM9615 LPASS Clock Controller"
>> +	select MSM_GCC_9615
> 
> s/MSM/MDM/

I was not sure about the config names, done.

>> +	depends on COMMON_CLK_QCOM
>> +	help
>> +	  Support for the LPASS clock controller on mdm9615 devices.
>> +	  Say Y if you want to use audio devices such as i2s, pcm,
>> +	  SLIMBus, etc.
>> +
>>  config MSM_MMCC_8960
>>  	tristate "MSM8960 Multimedia Clock Controller"
>>  	select MSM_GCC_8960
>> diff --git a/drivers/clk/qcom/gcc-mdm9615.c b/drivers/clk/qcom/gcc-mdm9615.c
>> new file mode 100644
>> index 0000000..3178f6a
>> --- /dev/null
>> +++ b/drivers/clk/qcom/gcc-mdm9615.c
>> @@ -0,0 +1,1709 @@
>> +
>> +static const struct regmap_config gcc_mdm9615_regmap_config = {
>> +	.reg_bits	= 32,
>> +	.reg_stride	= 4,
>> +	.val_bits	= 32,
>> +	.max_register	= 0x3660,
>> +	.fast_io	= true,
>> +};
>> +
>> +static const struct qcom_cc_desc gcc_mdm9615_desc = {
>> +	.config = &gcc_mdm9615_regmap_config,
>> +	.clks = gcc_mdm9615_clks,
>> +	.num_clks = ARRAY_SIZE(gcc_mdm9615_clks),
>> +	.resets = gcc_mdm9615_resets,
>> +	.num_resets = ARRAY_SIZE(gcc_mdm9615_resets),
>> +};
>> +
>> +static const struct of_device_id gcc_mdm9615_match_table[] = {
>> +	{ .compatible = "qcom,gcc-mdm9615", .data = &gcc_mdm9615_desc },
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(of, gcc_mdm9615_match_table);
>> +
>> +static int gcc_mdm9615_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	const struct of_device_id *match;
>> +	int ret;
>> +
>> +	match = of_match_device(gcc_mdm9615_match_table, &pdev->dev);
>> +	if (!match)
>> +		return -EINVAL;
>> +
>> +	ret = qcom_cc_register_board_clk(dev, "cxo_board", "cxo", 19200000);
> 
> This API is there to workaround failures to put the cxo_board clk
> in DT to begin with. Please just have cxo_board in the DT and
> then register a fixed factor of 1 clk here that we can swap out
> for an RPM clk later when RPM clks appear. See msm8996 for more
> details.

Ok, I added a DT cxo and aligned on msm8996.

Thanks.
Neil

>> +	if (ret)
>> +		return ret;
>> +
>> +	return qcom_cc_probe(pdev, match->data);
>> +}
>> +
>> +static struct platform_driver gcc_mdm9615_driver = {
>> +	.probe		= gcc_mdm9615_probe,
>> +	.driver		= {
>> +		.name	= "gcc-mdm9615",
>> +		.of_match_table = gcc_mdm9615_match_table,
>> +	},
>> +};
>> +
>> +static int __init gcc_mdm9615_init(void)
>> +{
>> +	return platform_driver_register(&gcc_mdm9615_driver);
>> +}
>> +core_initcall(gcc_mdm9615_init);
>> +
>> +static void __exit gcc_mdm9615_exit(void)
>> +{
>> +	platform_driver_unregister(&gcc_mdm9615_driver);
>> +}
>> +module_exit(gcc_mdm9615_exit);
>> +
>> +MODULE_DESCRIPTION("QCOM GCC MDM9615 Driver");
>> +MODULE_LICENSE("GPL v2");
>> +MODULE_ALIAS("platform:gcc-mdm9615");
>