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SubjectRe: [PATCH 3/4] clk: qcom: Add support to LPASS AUDIO_CC Glitch Free Mux clocks
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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@linaro.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?

> + 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;
> +};
> +
> +#define GFM_MASK BIT(1)
> +#define to_clk_gfm(_hw) container_of(_hw, struct clk_gfm, hw)
> +
> +static u8 clk_gfm_get_parent(struct clk_hw *hw)
> +{
> + struct clk_gfm *clk = to_clk_gfm(hw);
> +
> + return readl(clk->gfm_mux) & GFM_MASK;
> +}
> +
> +static int clk_gfm_set_parent(struct clk_hw *hw, u8 index)
> +{
> + struct clk_gfm *clk = to_clk_gfm(hw);
> + unsigned int val;
> +
> + val = readl(clk->gfm_mux);
> +
> + if (index)
> + val |= GFM_MASK;
> + else
> + val &= ~GFM_MASK;
> +
> + writel(val, clk->gfm_mux);
> +
> + return 0;
> +}
> +
> +static const struct clk_ops clk_gfm_ops = {
> + .get_parent = clk_gfm_get_parent,
> + .set_parent = clk_gfm_set_parent,
> + .determine_rate = __clk_mux_determine_rate,
> +};
> +
> +static struct clk_gfm lpass_gfm_wsa_mclk = {
> + .mux_reg = 0x220d8,
> + .mux_mask = BIT(0),
> + .hw.init = &(struct clk_init_data) {
> + .name = "WSA_MCLK",
> + .ops = &clk_gfm_ops,
> + .flags = CLK_SET_RATE_PARENT | CLK_OPS_PARENT_ENABLE,
> + .parent_names = (const char *[]){
> + "LPASS_CLK_ID_TX_CORE_MCLK",
> + "LPASS_CLK_ID_WSA_CORE_MCLK",
> + },
> + .parent_data = (const struct clk_parent_data[]){
> + { .index = 0 },
> + { .index = 1 },
> + },
> + .num_parents = 2,
> + },
> +};
> +
> +static struct clk_gfm lpass_gfm_wsa_npl = {
> + .mux_reg = 0x220d8,
> + .mux_mask = BIT(0),
> + .hw.init = &(struct clk_init_data) {
> + .name = "WSA_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_WSA_CORE_NPL_MCLK",
> + },
> + .parent_data = (const struct clk_parent_data[]){
> + { .index = 0 },
> + { .index = 1 },
> + },
> + .num_parents = 2,
> + },
> +};
> +
> +static struct clk_gfm lpass_gfm_rx_mclk_mclk2 = {
> + .mux_reg = 0x240d8,
> + .mux_mask = BIT(0),
> + .hw.init = &(struct clk_init_data) {
> + .name = "RX_MCLK_MCLK2",
> + .ops = &clk_gfm_ops,
> + .flags = CLK_SET_RATE_PARENT | CLK_OPS_PARENT_ENABLE,
> + .parent_names = (const char *[]){
> + "LPASS_CLK_ID_TX_CORE_MCLK",
> + "LPASS_CLK_ID_RX_CORE_MCLK",
> + },
> + .parent_data = (const struct clk_parent_data[]){
> + { .index = 0 },
> + { .index = 1 },
> + },
> + .num_parents = 2,
> + },
> +};
> +
> +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.

> + .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?

> +
> + data = of_device_get_match_data(dev);

What if data is 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.

> +
> + 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()?

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