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

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Message-ID: <20230511164623.iaziwwwfyroextce@ripper>
Date:   Thu, 11 May 2023 09:46:23 -0700
From:   Bjorn Andersson <andersson@...nel.org>
To:     Rohit Agarwal <quic_rohiagar@...cinc.com>
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 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.

Regards,
Bjorn