netdev - Re: [PATCH v7 4/4] pinctrl: qcom: Add SDX75 pincontrol driver

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Message-ID: <a66293bf-3231-dc23-aed4-22cbb91c3a5e@quicinc.com>
Date: Fri, 12 May 2023 14:27:28 +0530
From: Rohit Agarwal <quic_rohiagar@...cinc.com>
To: Bjorn Andersson <andersson@...nel.org>
CC: <agross@...nel.org>, <konrad.dybcio@...aro.org>,
        <linus.walleij@...aro.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <richardcochran@...il.com>,
        <manivannan.sadhasivam@...aro.org>, <andy.shevchenko@...il.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH v7 4/4] pinctrl: qcom: Add SDX75 pincontrol driver


On 5/11/2023 10:16 PM, Bjorn Andersson wrote:
> On Wed, May 10, 2023 at 08:30:25PM +0530, Rohit Agarwal wrote:
>> Add initial Qualcomm SDX75 pinctrl driver to support pin configuration
>> with pinctrl framework for SDX75 SoC.
>> While at it, reordering the SDX65 entry.
>>
> Nice, some comment below.
>
>> Signed-off-by: Rohit Agarwal <quic_rohiagar@...cinc.com>
>> ---
> [..]
>> diff --git a/drivers/pinctrl/qcom/pinctrl-sdx75.c b/drivers/pinctrl/qcom/pinctrl-sdx75.c
>> new file mode 100644
>> index 0000000..6f95c0a
>> --- /dev/null
>> +++ b/drivers/pinctrl/qcom/pinctrl-sdx75.c
>> @@ -0,0 +1,1595 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
>> +#include <linux/platform_device.h>
>> +#include "pinctrl-msm.h"
>> +
>> +#define REG_BASE 0x100000
> We typically reference the inner TLMM block and omit this offset... But
> I don't have a strong opinion.
>
> [..]
>
>> +enum sdx75_functions {
>> +	msm_mux_gpio,
> Please sort these alphabetically.
>
>> +	msm_mux_eth0_mdc,
> [..]
>> +	msm_mux__,
>> +};
>> +
> [..]
>> +static const struct pinfunction sdx75_functions[] = {
>> +	MSM_PIN_FUNCTION(gpio),
>> +	MSM_PIN_FUNCTION(eth0_mdc),
> Please sort these alphabetically, and please squash individual pins into
> their functional group.
>
> [..]
>> +	MSM_PIN_FUNCTION(qup_se0_l0),
>> +	MSM_PIN_FUNCTION(qup_se0_l1),
>> +	MSM_PIN_FUNCTION(qup_se0_l2),
>> +	MSM_PIN_FUNCTION(qup_se0_l3),
> E.g. this forces the DT writer to write individual -pins for each
> signal. Better keep it "qup_se0" and the author is free to group the
> pins in their states as they need (and as you know you don't need to
> specify all pins for a given function).
>
> [..]
>> +};
>> +
>> +/* Every pin is maintained as a single group, and missing or non-existing pin
>> + * would be maintained as dummy group to synchronize pin group index with
>> + * pin descriptor registered with pinctrl core.
>> + * Clients would not be able to request these dummy pin groups.
>> + */
> Please omit this comment.
>
>> +static const struct msm_pingroup sdx75_groups[] = {
> [..]
>> +	[16] = PINGROUP(16, pri_mi2s_ws, qup_se2_l2, qup_se1_l2_mirb, qdss_cti,
>> +			qdss_cti, _, _, _, _, _),
> Please break the rules and leave these lines unwrapped.
>
>> +	[17] = PINGROUP(17, pri_mi2s_data0, qup_se2_l3, qup_se1_l3_mirb,
>> +			qdss_cti, qdss_cti, _, _, _, _, _),
> [..]
>> +	[131] = PINGROUP(131, _, _, _, _, _, _, _, _, _, _),
>> +	[132] =	PINGROUP(132, _, _, _, _, _, _, _, _, _, _),
>> +	[133] = SDC_QDSD_PINGROUP(sdc1_rclk, 0x19A000, 16, 0),
> Lowercase hex digits please.
>
>> +	[134] = SDC_QDSD_PINGROUP(sdc1_clk, 0x19A000, 14, 6),
>> +	[135] = SDC_QDSD_PINGROUP(sdc1_cmd, 0x19A000, 11, 3),
>> +	[136] = SDC_QDSD_PINGROUP(sdc1_data, 0x19A000, 9, 0),
>> +	[137] = SDC_QDSD_PINGROUP(sdc2_clk, 0x19B000, 14, 6),
>> +	[138] = SDC_QDSD_PINGROUP(sdc2_cmd, 0x19B000, 11, 3),
>> +	[139] = SDC_QDSD_PINGROUP(sdc2_data, 0x19B000, 9, 0),
>> +};
> [..]
>> +static const struct of_device_id sdx75_pinctrl_of_match[] = {
>> +	{ .compatible = "qcom,sdx75-tlmm", .data = &sdx75_pinctrl },
>> +	{ }
>> +};
>> +
> [..]
>> +
>> +MODULE_DESCRIPTION("QTI sdx75 pinctrl driver");
>> +MODULE_LICENSE("GPL");
>> +MODULE_DEVICE_TABLE(of, sdx75_pinctrl_of_match);
> Keep the MODULE_DEVICE_TABLE() just below the sdx75_pinctrl_of_match
> please, so future readers doesn't need to search for it.
Will update all the comments in the next patch version.

Thanks for reviewing,
Rohit
> Regards,
> Bjorn