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Message-ID: <20230609120438.n7wnrpiqusasbly4@CAB-WSD-L081021>
Date: Fri, 9 Jun 2023 15:04:38 +0300
From: Dmitry Rokosov <ddrokosov@...rdevices.ru>
To: Neil Armstrong <neil.armstrong@...aro.org>
CC: Jerome Brunet <jbrunet@...libre.com>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Kevin Hilman <khilman@...libre.com>,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
<linux-amlogic@...ts.infradead.org>, <linux-clk@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <kernel@...rdevices.ru>,
<devicetree@...r.kernel.org>
Subject: Re: [PATCH 11/18] dt-bindings: clk: amlogic,a1-peripherals-clkc:
expose all clock ids
Hello Neil,
On Wed, Jun 07, 2023 at 12:56:22PM +0200, Neil Armstrong wrote:
> Due to a policy change in clock ID bindings handling, expose
> all the "private" clock IDs to the public clock dt-bindings
> to move out of the previous maintenance scheme.
>
> This refers to a discussion at [1] & [2] with Krzysztof about
> the issue with the current maintenance.
>
> It was decided to move every A1 peripherals ID to the public clock
> dt-bindings headers to be merged in a single tree so we
> can safely add new clocks without having merge issues.
>
> [1] https://lore.kernel.org/all/c088e01c-0714-82be-8347-6140daf56640@linaro.org/
> [2] https://lore.kernel.org/all/2fabe721-7434-43e7-bae5-088a42ba128d@app.fastmail.com/
>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
> drivers/clk/meson/a1-peripherals.h | 63 ----------------------
> .../clock/amlogic,a1-peripherals-clkc.h | 53 ++++++++++++++++++
> 2 files changed, 53 insertions(+), 63 deletions(-)
>
> diff --git a/drivers/clk/meson/a1-peripherals.h b/drivers/clk/meson/a1-peripherals.h
> index 4d60456a95a9..842b52634ed0 100644
> --- a/drivers/clk/meson/a1-peripherals.h
> +++ b/drivers/clk/meson/a1-peripherals.h
> @@ -46,67 +46,4 @@
> /* include the CLKIDs that have been made part of the DT binding */
> #include <dt-bindings/clock/amlogic,a1-peripherals-clkc.h>
>
> -/*
> - * CLKID index values for internal clocks
> - *
> - * These indices are entirely contrived and do not map onto the hardware.
> - * It has now been decided to expose everything by default in the DT header:
> - * include/dt-bindings/clock/a1-peripherals-clkc.h.
> - * Only the clocks ids we don't want to expose, such as the internal muxes and
> - * dividers of composite clocks, will remain defined here.
> - */
> -#define CLKID_XTAL_IN 0
> -#define CLKID_DSPA_SEL 61
> -#define CLKID_DSPB_SEL 62
> -#define CLKID_SARADC_SEL 74
> -#define CLKID_SYS_A_SEL 89
> -#define CLKID_SYS_A_DIV 90
> -#define CLKID_SYS_A 91
> -#define CLKID_SYS_B_SEL 92
> -#define CLKID_SYS_B_DIV 93
> -#define CLKID_SYS_B 94
> -#define CLKID_DSPA_A_DIV 96
> -#define CLKID_DSPA_A 97
> -#define CLKID_DSPA_B_DIV 99
> -#define CLKID_DSPA_B 100
> -#define CLKID_DSPB_A_DIV 102
> -#define CLKID_DSPB_A 103
> -#define CLKID_DSPB_B_DIV 105
> -#define CLKID_DSPB_B 106
> -#define CLKID_RTC_32K_IN 107
> -#define CLKID_RTC_32K_DIV 108
> -#define CLKID_RTC_32K_XTAL 109
> -#define CLKID_RTC_32K_SEL 110
> -#define CLKID_CECB_32K_IN 111
> -#define CLKID_CECB_32K_DIV 112
> -#define CLKID_CECA_32K_IN 115
> -#define CLKID_CECA_32K_DIV 116
> -#define CLKID_DIV2_PRE 119
> -#define CLKID_24M_DIV2 120
> -#define CLKID_GEN_DIV 122
> -#define CLKID_SARADC_DIV 123
> -#define CLKID_PWM_A_DIV 125
> -#define CLKID_PWM_B_DIV 127
> -#define CLKID_PWM_C_DIV 129
> -#define CLKID_PWM_D_DIV 131
> -#define CLKID_PWM_E_DIV 133
> -#define CLKID_PWM_F_DIV 135
> -#define CLKID_SPICC_SEL 136
> -#define CLKID_SPICC_DIV 137
> -#define CLKID_SPICC_SEL2 138
> -#define CLKID_TS_DIV 139
> -#define CLKID_SPIFC_SEL 140
> -#define CLKID_SPIFC_DIV 141
> -#define CLKID_SPIFC_SEL2 142
> -#define CLKID_USB_BUS_SEL 143
> -#define CLKID_USB_BUS_DIV 144
> -#define CLKID_SD_EMMC_SEL 145
> -#define CLKID_SD_EMMC_DIV 146
> -#define CLKID_PSRAM_SEL 148
> -#define CLKID_PSRAM_DIV 149
> -#define CLKID_PSRAM_SEL2 150
> -#define CLKID_DMC_SEL 151
> -#define CLKID_DMC_DIV 152
> -#define CLKID_DMC_SEL2 153
> -
> #endif /* __A1_PERIPHERALS_H */
> diff --git a/include/dt-bindings/clock/amlogic,a1-peripherals-clkc.h b/include/dt-bindings/clock/amlogic,a1-peripherals-clkc.h
> index ff2730f398a6..06f198ee7623 100644
> --- a/include/dt-bindings/clock/amlogic,a1-peripherals-clkc.h
> +++ b/include/dt-bindings/clock/amlogic,a1-peripherals-clkc.h
> @@ -10,6 +10,7 @@
> #ifndef __A1_PERIPHERALS_CLKC_H
> #define __A1_PERIPHERALS_CLKC_H
>
> +#define CLKID_XTAL_IN 0
> #define CLKID_FIXPLL_IN 1
> #define CLKID_USB_PHY_IN 2
> #define CLKID_USB_CTRL_IN 3
> @@ -70,6 +71,8 @@
> #define CLKID_CPU_CTRL 58
> #define CLKID_ROM 59
> #define CLKID_PROC_I2C 60
> +#define CLKID_DSPA_SEL 61
> +#define CLKID_DSPB_SEL 62
> #define CLKID_DSPA_EN 63
> #define CLKID_DSPA_EN_NIC 64
> #define CLKID_DSPB_EN 65
> @@ -81,6 +84,7 @@
> #define CLKID_12M 71
> #define CLKID_FCLK_DIV2_DIVN 72
> #define CLKID_GEN 73
> +#define CLKID_SARADC_SEL 74
> #define CLKID_SARADC 75
> #define CLKID_PWM_A 76
> #define CLKID_PWM_B 77
> @@ -95,21 +99,70 @@
> #define CLKID_SD_EMMC 86
> #define CLKID_PSRAM 87
> #define CLKID_DMC 88
> +#define CLKID_SYS_A_SEL 89
> +#define CLKID_SYS_A_DIV 90
> +#define CLKID_SYS_A 91
> +#define CLKID_SYS_B_SEL 92
> +#define CLKID_SYS_B_DIV 93
> +#define CLKID_SYS_B 94
> #define CLKID_DSPA_A_SEL 95
> +#define CLKID_DSPA_A_DIV 96
> +#define CLKID_DSPA_A 97
> #define CLKID_DSPA_B_SEL 98
> +#define CLKID_DSPA_B_DIV 99
> +#define CLKID_DSPA_B 100
> #define CLKID_DSPB_A_SEL 101
> +#define CLKID_DSPB_A_DIV 102
> +#define CLKID_DSPB_A 103
> #define CLKID_DSPB_B_SEL 104
> +#define CLKID_DSPB_B_DIV 105
> +#define CLKID_DSPB_B 106
> +#define CLKID_RTC_32K_IN 107
> +#define CLKID_RTC_32K_DIV 108
> +#define CLKID_RTC_32K_XTAL 109
> +#define CLKID_RTC_32K_SEL 110
> +#define CLKID_CECB_32K_IN 111
> +#define CLKID_CECB_32K_DIV 112
> #define CLKID_CECB_32K_SEL_PRE 113
> #define CLKID_CECB_32K_SEL 114
> +#define CLKID_CECA_32K_IN 115
> +#define CLKID_CECA_32K_DIV 116
> #define CLKID_CECA_32K_SEL_PRE 117
> #define CLKID_CECA_32K_SEL 118
> +#define CLKID_DIV2_PRE 119
> +#define CLKID_24M_DIV2 120
> #define CLKID_GEN_SEL 121
> +#define CLKID_GEN_DIV 122
> +#define CLKID_SARADC_DIV 123
> #define CLKID_PWM_A_SEL 124
> +#define CLKID_PWM_A_DIV 125
> #define CLKID_PWM_B_SEL 126
> +#define CLKID_PWM_B_DIV 127
> #define CLKID_PWM_C_SEL 128
> +#define CLKID_PWM_C_DIV 129
> #define CLKID_PWM_D_SEL 130
> +#define CLKID_PWM_D_DIV 131
> #define CLKID_PWM_E_SEL 132
> +#define CLKID_PWM_E_DIV 133
> #define CLKID_PWM_F_SEL 134
> +#define CLKID_PWM_F_DIV 135
> +#define CLKID_SPICC_SEL 136
> +#define CLKID_SPICC_DIV 137
> +#define CLKID_SPICC_SEL2 138
> +#define CLKID_TS_DIV 139
> +#define CLKID_SPIFC_SEL 140
> +#define CLKID_SPIFC_DIV 141
> +#define CLKID_SPIFC_SEL2 142
> +#define CLKID_USB_BUS_SEL 143
> +#define CLKID_USB_BUS_DIV 144
> +#define CLKID_SD_EMMC_SEL 145
> +#define CLKID_SD_EMMC_DIV 146
> #define CLKID_SD_EMMC_SEL2 147
> +#define CLKID_PSRAM_SEL 148
> +#define CLKID_PSRAM_DIV 149
> +#define CLKID_PSRAM_SEL2 150
> +#define CLKID_DMC_SEL 151
> +#define CLKID_DMC_DIV 152
> +#define CLKID_DMC_SEL2 153
>
> #endif /* __A1_PERIPHERALS_CLKC_H */
>
> --
> 2.34.1
>
Reviewed-by: Dmitry Rokosov <ddrokosov@...rdevices.ru>
By the way, I can share another approach for 'private' clock bindings.
Instead of registering 'private' clock objects on the hw_provider side,
they can be completely omitted and registered only as clock objects.
The such approach restricts internal clock usage by public device tree
at all.
I've already introduced this approach in one of the versions for a1
series (the approach was suggested by Krzysztof).
https://lore.kernel.org/all/20230321193014.26349-6-ddrokosov@sberdevices.ru/
---
+/* Array of all clocks provided by this provider */
+static struct clk_hw_onecell_data a1_periphs_public_clks = {
+ .hws = {
+ [CLKID_FIXPLL_IN] = &fixpll_in.hw,
+ [CLKID_USB_PHY_IN] = &usb_phy_in.hw,
+ [CLKID_USB_CTRL_IN] = &usb_ctrl_in.hw,
+ [CLKID_HIFIPLL_IN] = &hifipll_in.hw,
+ [CLKID_SYSPLL_IN] = &syspll_in.hw,
+ [CLKID_DDS_IN] = &dds_in.hw,
+ [CLKID_SYS] = &sys.hw,
+ [CLKID_CLKTREE] = &clktree.hw,
+ [CLKID_RESET_CTRL] = &reset_ctrl.hw,
+ [CLKID_ANALOG_CTRL] = &analog_ctrl.hw,
+ [CLKID_PWR_CTRL] = &pwr_ctrl.hw,
[...]
+/*
+ * These clocks are entirely contrived and do not map onto the hardware.
+ * It has now been decided to expose public clocks in the DT bindings.
+ * Only below clocks we don't want to expose, such as the internal muxes
+ * and dividers of composite clocks, will remain defined here.
+ */
+static struct clk_hw_onecell_data a1_periphs_private_clks = {
+ .hws = {
+ &xtal_in.hw,
+ &dspa_sel.hw,
+ &dspb_sel.hw,
+ &saradc_sel.hw,
+ &sys_a_sel.hw,
+ &sys_a_div.hw,
+ &sys_a.hw,
+ &sys_b_sel.hw,
+ &sys_b_div.hw,
[...]
---
--
Thank you,
Dmitry
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