[PATCH v2 2/7] clk/qcom: Add Milos clock driver
Sumit Garg
sumit.garg at kernel.org
Tue Mar 24 06:42:37 CET 2026
On Wed, Mar 18, 2026 at 01:46:28PM +0100, Luca Weiss wrote:
> Add Clock driver for the GCC block found in the Milos SoC.
>
> The qcom-snps-eusb2-hsphy driver requires the TCXO frequency ("ref"
> clock), so we need to pass that as well.
>
> Signed-off-by: Luca Weiss <luca.weiss at fairphone.com>
> ---
> drivers/clk/qcom/Kconfig | 8 ++
> drivers/clk/qcom/Makefile | 1 +
> drivers/clk/qcom/clock-milos.c | 196 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 205 insertions(+)
>
Reviewed-by: Sumit Garg <sumit.garg at oss.qualcomm.com>
-Sumit
> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
> index 8504ed5d656..0a2ce55aaa2 100644
> --- a/drivers/clk/qcom/Kconfig
> +++ b/drivers/clk/qcom/Kconfig
> @@ -47,6 +47,14 @@ config CLK_QCOM_IPQ9574
> on the Snapdragon IPQ9574 SoC. This driver supports the clocks
> and resets exposed by the GCC hardware block.
>
> +config CLK_QCOM_MILOS
> + bool "Qualcomm Milos GCC"
> + select CLK_QCOM
> + help
> + Say Y here to enable support for the Global Clock Controller
> + on the Snapdragon Milos SoC. This driver supports the clocks
> + and resets exposed by the GCC hardware block.
> +
> config CLK_QCOM_QCM2290
> bool "Qualcomm QCM2290 GCC"
> select CLK_QCOM
> diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
> index 82a5b166196..b96d61b603e 100644
> --- a/drivers/clk/qcom/Makefile
> +++ b/drivers/clk/qcom/Makefile
> @@ -9,6 +9,7 @@ obj-$(CONFIG_CLK_QCOM_APQ8096) += clock-apq8096.o
> obj-$(CONFIG_CLK_QCOM_IPQ4019) += clock-ipq4019.o
> obj-$(CONFIG_CLK_QCOM_IPQ5424) += clock-ipq5424.o
> obj-$(CONFIG_CLK_QCOM_IPQ9574) += clock-ipq9574.o
> +obj-$(CONFIG_CLK_QCOM_MILOS) += clock-milos.o
> obj-$(CONFIG_CLK_QCOM_QCM2290) += clock-qcm2290.o
> obj-$(CONFIG_CLK_QCOM_QCS404) += clock-qcs404.o
> obj-$(CONFIG_CLK_QCOM_QCS8300) += clock-qcs8300.o
> diff --git a/drivers/clk/qcom/clock-milos.c b/drivers/clk/qcom/clock-milos.c
> new file mode 100644
> index 00000000000..afe59108559
> --- /dev/null
> +++ b/drivers/clk/qcom/clock-milos.c
> @@ -0,0 +1,196 @@
> +// SPDX-License-Identifier: BSD-3-Clause
> +/*
> + * Clock drivers for Qualcomm Milos
> + *
> + * (C) Copyright 2024 Linaro Ltd.
> + * (C) Copyright 2026 Luca Weiss <luca.weiss at fairphone.com>
> + */
> +
> +#include <clk-uclass.h>
> +#include <dm.h>
> +#include <linux/delay.h>
> +#include <errno.h>
> +#include <asm/io.h>
> +#include <linux/bug.h>
> +#include <linux/bitops.h>
> +#include <dt-bindings/clock/qcom,milos-gcc.h>
> +#include <dt-bindings/clock/qcom,rpmh.h>
> +
> +#include "clock-qcom.h"
> +
> +/* On-board TCXO, TOFIX get from DT */
> +#define TCXO_RATE 76800000
> +
> +/* bi_tcxo_div4 divided after RPMh output */
> +#define TCXO_DIV4_RATE (TCXO_RATE / 4)
> +
> +static const struct freq_tbl ftbl_gcc_qupv3_wrap0_s3_clk_src[] = {
> + F(7372800, CFG_CLK_SRC_GPLL0_EVEN, 1, 384, 15625),
> + F(14745600, CFG_CLK_SRC_GPLL0_EVEN, 1, 768, 15625),
> + F(19200000, CFG_CLK_SRC_CXO, 1, 0, 0),
> + F(29491200, CFG_CLK_SRC_GPLL0_EVEN, 1, 1536, 15625),
> + F(32000000, CFG_CLK_SRC_GPLL0_EVEN, 1, 8, 75),
> + F(48000000, CFG_CLK_SRC_GPLL0_EVEN, 1, 4, 25),
> + F(51200000, CFG_CLK_SRC_GPLL0_EVEN, 1, 64, 375),
> + F(64000000, CFG_CLK_SRC_GPLL0_EVEN, 1, 16, 75),
> + F(75000000, CFG_CLK_SRC_GPLL0_EVEN, 4, 0, 0),
> + F(80000000, CFG_CLK_SRC_GPLL0_EVEN, 1, 4, 15),
> + F(96000000, CFG_CLK_SRC_GPLL0_EVEN, 1, 8, 25),
> + F(100000000, CFG_CLK_SRC_GPLL0, 6, 0, 0),
> + { }
> +};
> +
> +static const struct freq_tbl ftbl_gcc_sdcc2_apps_clk_src[] = {
> + F(400000, CFG_CLK_SRC_CXO, 12, 1, 4),
> + F(25000000, CFG_CLK_SRC_GPLL0_EVEN, 12, 0, 0),
> + F(37500000, CFG_CLK_SRC_GPLL0_EVEN, 8, 0, 0),
> + F(50000000, CFG_CLK_SRC_GPLL0_EVEN, 6, 0, 0),
> + F(100000000, CFG_CLK_SRC_GPLL0_EVEN, 3, 0, 0),
> + /* TOFIX F(202000000, CFG_CLK_SRC_GPLL9, 4, 0, 0), */
> + { }
> +};
> +
> +static const struct freq_tbl ftbl_gcc_usb30_prim_master_clk_src[] = {
> + F(66666667, CFG_CLK_SRC_GPLL0_EVEN, 4.5, 0, 0),
> + F(133333333, CFG_CLK_SRC_GPLL0, 4.5, 0, 0),
> + F(200000000, CFG_CLK_SRC_GPLL0, 3, 0, 0),
> + F(240000000, CFG_CLK_SRC_GPLL0, 2.5, 0, 0),
> + { }
> +};
> +
> +static ulong milos_set_rate(struct clk *clk, ulong rate)
> +{
> + struct msm_clk_priv *priv = dev_get_priv(clk->dev);
> + const struct freq_tbl *freq;
> +
> + switch (clk->id) {
> + case GCC_QUPV3_WRAP0_S5_CLK: /* UART5 */
> + freq = qcom_find_freq(ftbl_gcc_qupv3_wrap0_s3_clk_src, rate);
> + clk_rcg_set_rate_mnd(priv->base, 0x18500,
> + freq->pre_div, freq->m, freq->n, freq->src, 16);
> + return freq->freq;
> + case GCC_SDCC2_APPS_CLK:
> + freq = qcom_find_freq(ftbl_gcc_sdcc2_apps_clk_src, rate);
> + clk_rcg_set_rate_mnd(priv->base, 0x14018,
> + freq->pre_div, freq->m, freq->n, freq->src, 8);
> + return freq->freq;
> + case GCC_USB30_PRIM_MASTER_CLK:
> + freq = qcom_find_freq(ftbl_gcc_usb30_prim_master_clk_src, rate);
> + clk_rcg_set_rate_mnd(priv->base, 0x3902c,
> + freq->pre_div, freq->m, freq->n, freq->src, 8);
> + return freq->freq;
> + case GCC_USB30_PRIM_MOCK_UTMI_CLK:
> + clk_rcg_set_rate(priv->base, 0x39044, 0, 0);
> + return TCXO_DIV4_RATE;
> + default:
> + return 0;
> + }
> +}
> +
> +static const struct gate_clk milos_clks[] = {
> + GATE_CLK(GCC_AGGRE_USB3_PRIM_AXI_CLK, 0x39090, BIT(0)),
> + GATE_CLK(GCC_QUPV3_WRAP0_S5_CLK, 0x52008, BIT(27)),
> + GATE_CLK(GCC_QUPV3_WRAP_0_M_AHB_CLK, 0x52008, BIT(20)),
> + GATE_CLK(GCC_QUPV3_WRAP_0_S_AHB_CLK, 0x52008, BIT(21)),
> + GATE_CLK(GCC_SDCC2_AHB_CLK, 0x14010, BIT(0)),
> + GATE_CLK(GCC_SDCC2_APPS_CLK, 0x14004, BIT(0)),
> + GATE_CLK(GCC_USB30_PRIM_MASTER_CLK, 0x39018, BIT(0)),
> + GATE_CLK(GCC_USB30_PRIM_MOCK_UTMI_CLK, 0x39028, BIT(0)),
> + GATE_CLK(GCC_USB30_PRIM_SLEEP_CLK, 0x39024, BIT(0)),
> + GATE_CLK(GCC_CFG_NOC_USB3_PRIM_AXI_CLK, 0x3908c, BIT(0)),
> +};
> +
> +static int milos_enable(struct clk *clk)
> +{
> + struct msm_clk_priv *priv = dev_get_priv(clk->dev);
> +
> + switch (clk->id) {
> + case GCC_AGGRE_USB3_PRIM_AXI_CLK:
> + qcom_gate_clk_en(priv, GCC_USB30_PRIM_MASTER_CLK);
> + break;
> + }
> +
> + return qcom_gate_clk_en(priv, clk->id);
> +}
> +
> +static const struct qcom_reset_map milos_gcc_resets[] = {
> + [GCC_QUSB2PHY_PRIM_BCR] = { 0x12000 },
> + [GCC_SDCC1_BCR] = { 0xa3000 },
> + [GCC_SDCC2_BCR] = { 0x14000 },
> + [GCC_UFS_PHY_BCR] = { 0x77000 },
> + [GCC_USB30_PRIM_BCR] = { 0x39000 },
> +};
> +
> +static const struct qcom_power_map milos_gdscs[] = {
> + [UFS_PHY_GDSC] = { 0x77004 },
> + [UFS_MEM_PHY_GDSC] = { 0x9e000 },
> + [USB30_PRIM_GDSC] = { 0x39004 },
> +};
> +
> +static struct msm_clk_data milos_gcc_data = {
> + .resets = milos_gcc_resets,
> + .num_resets = ARRAY_SIZE(milos_gcc_resets),
> + .clks = milos_clks,
> + .num_clks = ARRAY_SIZE(milos_clks),
> + .power_domains = milos_gdscs,
> + .num_power_domains = ARRAY_SIZE(milos_gdscs),
> +
> + .enable = milos_enable,
> + .set_rate = milos_set_rate,
> +};
> +
> +static const struct udevice_id gcc_milos_of_match[] = {
> + {
> + .compatible = "qcom,milos-gcc",
> + .data = (ulong)&milos_gcc_data,
> + },
> + { }
> +};
> +
> +U_BOOT_DRIVER(gcc_milos) = {
> + .name = "gcc_milos",
> + .id = UCLASS_NOP,
> + .of_match = gcc_milos_of_match,
> + .bind = qcom_cc_bind,
> + .flags = DM_FLAG_PRE_RELOC | DM_FLAG_DEFAULT_PD_CTRL_OFF,
> +};
> +
> +static ulong milos_rpmh_clk_set_rate(struct clk *clk, ulong rate)
> +{
> + return (clk->rate = rate);
> +}
> +
> +static ulong milos_rpmh_clk_get_rate(struct clk *clk)
> +{
> + switch (clk->id) {
> + case RPMH_CXO_CLK:
> + return TCXO_DIV4_RATE;
> + default:
> + return clk->rate;
> + }
> +}
> +
> +static int milos_rpmh_clk_nop(struct clk *clk)
> +{
> + return 0;
> +}
> +
> +static struct clk_ops milos_rpmh_clk_ops = {
> + .set_rate = milos_rpmh_clk_set_rate,
> + .get_rate = milos_rpmh_clk_get_rate,
> + .enable = milos_rpmh_clk_nop,
> + .disable = milos_rpmh_clk_nop,
> +};
> +
> +static const struct udevice_id milos_rpmh_clk_ids[] = {
> + { .compatible = "qcom,milos-rpmh-clk" },
> + { }
> +};
> +
> +U_BOOT_DRIVER(milos_rpmh_clk) = {
> + .name = "milos_rpmh_clk",
> + .id = UCLASS_CLK,
> + .of_match = milos_rpmh_clk_ids,
> + .ops = &milos_rpmh_clk_ops,
> + .flags = DM_FLAG_DEFAULT_PD_CTRL_OFF,
> +};
>
> --
> 2.53.0
>
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