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Date: Tue, 22 Sep 2020 22:45:07 +0100
From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To: Stephen Boyd <sboyd@...nel.org>, devicetree@...r.kernel.org,
linux-clk@...r.kernel.org
Cc: bjorn.andersson@...aro.org, mturquette@...libre.com,
robh+dt@...nel.org, linux-arm-msm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] clk: qcom: Add support to LPASS AUDIO_CC Glitch Free
Mux clocks
Thanks Stephen for review,
On 22/09/2020 19:41, Stephen Boyd wrote:
> Quoting Srinivas Kandagatla (2020-09-17 06:28:49)
>> GFM Muxes in AUDIO_CC control clocks to LPASS WSA and RX Codec Macros.
>> This patch adds support to these muxes.
>>
>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>> ---
>> drivers/clk/qcom/Kconfig | 7 +
>> drivers/clk/qcom/Makefile | 1 +
>> drivers/clk/qcom/lpass-gfm-sm8250.c | 235 ++++++++++++++++++++++++++++
>> 3 files changed, 243 insertions(+)
>> create mode 100644 drivers/clk/qcom/lpass-gfm-sm8250.c
>>
>> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
>> index 2eda63b7c46c..4e46fd339e62 100644
>> --- a/drivers/clk/qcom/Kconfig
>> +++ b/drivers/clk/qcom/Kconfig
>> @@ -494,4 +494,11 @@ config KRAITCC
>> Support for the Krait CPU clocks on Qualcomm devices.
>> Say Y if you want to support CPU frequency scaling.
>>
>> +config CLK_GFM_LPASS_SM8250
>> + tristate "GFM LPASS Clocks"
>> + depends on SND_SOC_QDSP6_COMMON
>
> What is the depends for?
I think I forgot to remove this!
>
>> + help
>> + Support for the GFM Glitch Free Mux LPASS clock. Say Y
>> + if you want to support GFM Clocks on LPASS for SM8250 SoC.
>> +
>> endif
>> diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
>> index 8eb395d02a32..c18e4ead6c9e 100644
>> --- a/drivers/clk/qcom/Makefile
>> +++ b/drivers/clk/qcom/Makefile
>> @@ -74,3 +74,4 @@ obj-$(CONFIG_SPMI_PMIC_CLKDIV) += clk-spmi-pmic-div.o
>> obj-$(CONFIG_KPSS_XCC) += kpss-xcc.o
>> obj-$(CONFIG_QCOM_HFPLL) += hfpll.o
>> obj-$(CONFIG_KRAITCC) += krait-cc.o
>> +obj-$(CONFIG_CLK_GFM_LPASS_SM8250) += lpass-gfm-sm8250.o
>
> I don't know but probably this should be sorted by Kconfig instead of
> tacked onto the end here.
>
>> diff --git a/drivers/clk/qcom/lpass-gfm-sm8250.c b/drivers/clk/qcom/lpass-gfm-sm8250.c
>> new file mode 100644
>> index 000000000000..2d5c41ae4969
>> --- /dev/null
>> +++ b/drivers/clk/qcom/lpass-gfm-sm8250.c
>> @@ -0,0 +1,235 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/clk-provider.h>
>> +#include <linux/io.h>
>> +#include <linux/clk.h>
>> +#include <linux/slab.h>
>> +#include <linux/err.h>
>> +#include <linux/notifier.h>
>> +#include <linux/device.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/of_device.h>
>> +#include <dt-bindings/clock/qcom,sm8250-lpass-audiocc.h>
>> +
>> +struct lpass_gfm {
>> + struct device *dev;
>> + void __iomem *base;
>> + struct clk *core_vote;
>> + struct clk *bus_clk;
>> +};
>> +
>> +struct clk_gfm {
>> + unsigned int mux_reg;
>> + unsigned int mux_mask;
>> + struct clk_hw hw;
>> + struct lpass_gfm *priv;
>> + void __iomem *gfm_mux;
>> +};
>> +
...
>> +static struct clk_gfm lpass_gfm_rx_npl = {
>> + .mux_reg = 0x240d8,
>> + .mux_mask = BIT(0),
>> + .hw.init = &(struct clk_init_data) {
>> + .name = "RX_NPL",
>> + .ops = &clk_gfm_ops,
>> + .flags = CLK_SET_RATE_PARENT | CLK_OPS_PARENT_ENABLE,
>> + .parent_names = (const char *[]){
>> + "LPASS_CLK_ID_TX_CORE_NPL_MCLK",
>> + "LPASS_CLK_ID_RX_CORE_NPL_MCLK",
>> + },
>> + .parent_data = (const struct clk_parent_data[]){
>> + { .index = 0 },
>> + { .index = 1 },
>> + },
>
> Please use parent_data instead of parent_names. The name can go in the
> parent_data struct.
Ah.. I missed that, will fix that in next version!
>
>> + .num_parents = 2,
>> + },
>> +};
>> +
>> +static struct clk_gfm *audiocc_gfm_clks[] = {
>> + [LPASS_CDC_WSA_NPL] = &lpass_gfm_wsa_npl,
>> + [LPASS_CDC_WSA_MCLK] = &lpass_gfm_wsa_mclk,
>> + [LPASS_CDC_RX_NPL] = &lpass_gfm_rx_npl,
>> + [LPASS_CDC_RX_MCLK_MCLK2] = &lpass_gfm_rx_mclk_mclk2,
>> +};
>> +
>> +static struct clk_hw_onecell_data audiocc_hw_onecell_data = {
>> + .hws = {
>> + [LPASS_CDC_WSA_NPL] = &lpass_gfm_wsa_npl.hw,
>> + [LPASS_CDC_WSA_MCLK] = &lpass_gfm_wsa_mclk.hw,
>> + [LPASS_CDC_RX_NPL] = &lpass_gfm_rx_npl.hw,
>> + [LPASS_CDC_RX_MCLK_MCLK2] = &lpass_gfm_rx_mclk_mclk2.hw,
>> + },
>> + .num = ARRAY_SIZE(audiocc_gfm_clks),
>> +};
>> +
>> +struct lpass_gfm_data {
>> + struct clk_hw_onecell_data *onecell_data;
>> + struct clk_gfm **gfm_clks;
>> +};
>> +
>> +static struct lpass_gfm_data audiocc_data = {
>> + .onecell_data = &audiocc_hw_onecell_data,
>> + .gfm_clks = audiocc_gfm_clks,
>> +};
>> +
>> +static int lpass_gfm_clk_driver_probe(struct platform_device *pdev)
>> +{
>> + const struct lpass_gfm_data *data;
>> + struct device *dev = &pdev->dev;
>> + struct resource *res;
>> + struct clk_gfm *gfm;
>> + struct lpass_gfm *cc;
>> + int err, i;
>> +
>> + cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
>> + if (!cc)
>> + return -ENOMEM;
>> +
>> + cc->core_vote = devm_clk_get(&pdev->dev, "core");
>> + if (IS_ERR(cc->core_vote)) {
>> + dev_dbg(dev, "Failed to get lpass core clk\n");
>> + return PTR_ERR(cc->core_vote);
>> + }
>
> Can this use the pm_clk stuff?
you mean add runtime pm support or something else?
I can give it a go and see!
>
>> +
>> + data = of_device_get_match_data(dev);
>
> What if data is NULL?
It should not be here if there is no match of compatible string, so data
should not be NULL!
>
>> + cc->bus_clk = devm_clk_get(&pdev->dev, "bus");
>> + if (IS_ERR(cc->bus_clk)) {
>> + dev_dbg(dev, "Failed to get lpass bus clk\n");
>> + return PTR_ERR(cc->bus_clk);
>> + }
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + cc->base = devm_ioremap_resource(dev, res);
>> + if (IS_ERR(cc->base))
>> + return PTR_ERR(cc->base);
>> +
>> + clk_prepare_enable(cc->core_vote);
>> + clk_prepare_enable(cc->bus_clk);
>
> These will always be left enabled if the probe function bails out after here.
>
I agree, Will add some error handling
>> +
>> + for (i = 0; i < data->onecell_data->num; i++) {
>> + if (!data->gfm_clks[i])
>> + continue;
>> +
>> + gfm = data->gfm_clks[i];
>> + gfm->priv = cc;
>> + gfm->gfm_mux = cc->base;
>> + gfm->gfm_mux = gfm->gfm_mux + data->gfm_clks[i]->mux_reg;
>> +
>> + err = devm_clk_hw_register(dev, &data->gfm_clks[i]->hw);
>> + if (err)
>> + return err;
>> +
>> + }
>> +
>> + return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
>> + data->onecell_data);
>> +}
>> +
>> +static const struct of_device_id lpass_gfm_clk_match_table[] = {
>> + {
>> + .compatible = "qcom,sm8250-lpass-audiocc",
>> + .data = &audiocc_data,
>> + },
>> + { }
>> +};
>> +
>> +static struct platform_driver lpass_gfm_clk_driver = {
>> + .probe = lpass_gfm_clk_driver_probe,
>> + .driver = {
>> + .name = "lpass-gfm-clk",
>> + .of_match_table = lpass_gfm_clk_match_table,
>> + },
>> +};
>> +builtin_platform_driver(lpass_gfm_clk_driver);
>
> Should be module_platform_driver()?
sure, will do that!
>
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