linux-kernel - Re: [PATCH 3/4] clk: qcom: camcc-sc8280xp: Add sc8280xp CAMCC

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Date:   Mon, 25 Sep 2023 10:06:38 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>, andersson@...nel.org,
        agross@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, jonathan@...ek.ca, quic_tdas@...cinc.com,
        vladimir.zapolskiy@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] clk: qcom: camcc-sc8280xp: Add sc8280xp CAMCC

On 25/09/2023 09:51, Konrad Dybcio wrote:
> On 23.09.2023 17:00, Bryan O'Donoghue wrote:
>> Add the sc8280xp CAMCC driver which follows the sdm845 CAMCC lineage
>> with additional CCI and IFE blocks and more granular clock parentage.
>>
>> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
>> ---
>>   drivers/clk/qcom/Kconfig          |    9 +
>>   drivers/clk/qcom/Makefile         |    1 +
>>   drivers/clk/qcom/camcc-sc8280xp.c | 3051 +++++++++++++++++++++++++++++
>>   3 files changed, 3061 insertions(+)
>>   create mode 100644 drivers/clk/qcom/camcc-sc8280xp.c
>>
>> diff --git a/drivers/clk/qcom/Kconfig b/drivers/clk/qcom/Kconfig
>> index 4b72e98eaa70..5ce6d888aba0 100644
>> --- a/drivers/clk/qcom/Kconfig
>> +++ b/drivers/clk/qcom/Kconfig
>> @@ -426,6 +426,15 @@ config SC_CAMCC_7280
>>   	  Say Y if you want to support camera devices and functionality such as
>>   	  capturing pictures.
>>   
>> +config SC_CAMCC_8280XP
>> +	tristate "SC8280XP Camera Clock Controller"
>> +	select SC_GCC_8280XP
>> +	help
>> +	  Support for the camera clock controller on Qualcomm Technologies, Inc
>> +	  SC8280XP devices.
>> +	  Say Y if you want to support camera devices and functionality such as
>> +	  capturing pictures.
>> +
>>   config SC_DISPCC_7180
>>   	tristate "SC7180 Display Clock Controller"
>>   	depends on ARM64 || COMPILE_TEST
>> diff --git a/drivers/clk/qcom/Makefile b/drivers/clk/qcom/Makefile
>> index a301b08dba05..8f66cefa9e57 100644
>> --- a/drivers/clk/qcom/Makefile
>> +++ b/drivers/clk/qcom/Makefile
>> @@ -68,6 +68,7 @@ obj-$(CONFIG_QCS_TURING_404) += turingcc-qcs404.o
>>   obj-$(CONFIG_QDU_GCC_1000) += gcc-qdu1000.o
>>   obj-$(CONFIG_SC_CAMCC_7180) += camcc-sc7180.o
>>   obj-$(CONFIG_SC_CAMCC_7280) += camcc-sc7280.o
>> +obj-$(CONFIG_SC_CAMCC_8280XP) += camcc-sc8280xp.o
>>   obj-$(CONFIG_SC_DISPCC_7180) += dispcc-sc7180.o
>>   obj-$(CONFIG_SC_DISPCC_7280) += dispcc-sc7280.o
>>   obj-$(CONFIG_SC_DISPCC_8280XP) += dispcc-sc8280xp.o
>> diff --git a/drivers/clk/qcom/camcc-sc8280xp.c b/drivers/clk/qcom/camcc-sc8280xp.c
>> new file mode 100644
>> index 000000000000..fbb3fa39862c
>> --- /dev/null
>> +++ b/drivers/clk/qcom/camcc-sc8280xp.c
>> @@ -0,0 +1,3051 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright (c) 2021, The Linux Foundation. All rights reserved.
>> + * Copyright (c) 2023, Linaro Ltd.
>> + */
>> +
>> +#include <linux/clk-provider.h>
>> +#include <linux/err.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of.h>
>> +#include <linux/pm_clock.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/regmap.h>
>> +#include <linux/pm_runtime.h>
>> +
>> +#include <dt-bindings/clock/qcom,camcc-sc8280xp.h>
>> +
>> +#include "clk-alpha-pll.h"
>> +#include "clk-branch.h"
>> +#include "clk-rcg.h"
>> +#include "clk-regmap.h"
>> +#include "common.h"
>> +#include "gdsc.h"
>> +#include "reset.h"
>> +
>> +enum {
>> +	DT_BI_TCXO,
>> +	DT_BI_TCXO_AO,
>> +	DT_SLEEP_CLK,
>> +};
> This enum here is so that
> 
> [...]
> 
>> +static struct clk_alpha_pll cam_cc_pll0 = {
>> +	.offset = 0x0,
>> +	.vco_table = lucid_vco,
>> +	.num_vco = ARRAY_SIZE(lucid_vco),
>> +	.regs = clk_alpha_pll_regs[CLK_ALPHA_PLL_TYPE_LUCID],
>> +	.clkr = {
>> +		.hw.init = &(struct clk_init_data){
>> +			.name = "cam_cc_pll0",
>> +			.parent_data = &(const struct clk_parent_data){
>> +				.fw_name = "bi_tcxo", .name = "bi_tcxo",
> you can use .index = <some enum member> here
> 

Hmm. I actually think I _removed_ those indexes from the reference code.

doh !

> [...]
> 
>> +
>> +static const struct clk_parent_data cam_cc_parent_data_0[] = {
>> +	{ .fw_name = "bi_tcxo", .name = "bi_tcxo" },
> also in these arrays
> 
> [...]
> 
>> +static struct gdsc bps_gdsc = {
>> +	.gdscr = 0x7004,
>> +	.pd = {
>> +		.name = "bps_gdsc",
>> +	},
>> +	.flags = HW_CTRL | RETAIN_FF_ENABLE,
> HW_CTRL means "hardware controlled mode is always on", not
> "hardware controlled mode is available". Is that what you want?

That's what the downstream flags

drivers/clk/qcom/camcc-sc7180.c::bps_gdsc
drivers/clk/qcom/camcc-sc7280.c::bps_gdsc
drivers/clk/qcom/camcc-sdm845.c::bps_gdsc
drivers/clk/qcom/camcc-sm8250.c::bps_gdsc
drivers/clk/qcom/camcc-sm8450.c::bps_gdsc

etc

> Also, does this clock controller not take GCC_CAMERA_AHB_CLK as
> input?

it does yeah.

---
bod