linux-kernel - Re: [PATCH v5 4/4] clk: sprd: Add clocks support for UMS512

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Date:   Mon, 11 Jul 2022 13:26:52 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Cixi Geng <gengcixi@...il.com>, baolin.wang7@...il.com,
        krzysztof.kozlowski+dt@...aro.org, lee.jones@...aro.org,
        mturquette@...libre.com, orsonzhai@...il.com, robh+dt@...nel.org,
        zhang.lyra@...il.com
Cc:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4/4] clk: sprd: Add clocks support for UMS512

Quoting Cixi Geng (2022-05-05 03:14:33)
> diff --git a/drivers/clk/sprd/ums512-clk.c b/drivers/clk/sprd/ums512-clk.c
> new file mode 100644
> index 000000000000..53ed58de61cd
> --- /dev/null
> +++ b/drivers/clk/sprd/ums512-clk.c
> @@ -0,0 +1,2199 @@
> +// SPDX-License-Identifier: GPL

Please pick an appropriate license.

WARNING: 'SPDX-License-Identifier: GPL' is not supported in LICENSES/...
#49: FILE: drivers/clk/sprd/ums512-clk.c:1:
+// SPDX-License-Identifier: GPL

> +/*
> + * Unisoc UMS512 clock driver
> + *
> + * Copyright (C) 2022 Unisoc, Inc.
> + * Author: Xiaolong Zhang <xiaolong.zhang@...soc.com>
> + */
> +
> +#include <linux/clk-provider.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +#include <dt-bindings/clock/sprd,ums512-clk.h>
> +
> +#include "common.h"
> +#include "composite.h"
> +#include "div.h"
> +#include "gate.h"
> +#include "mux.h"
> +#include "pll.h"
> +
> +#define UMS512_MUX_FLAG        \
> +       (CLK_GET_RATE_NOCACHE | CLK_SET_RATE_NO_REPARENT)

Why do we need nocache?

> +
> +/* pll gate clock */
> +/* some pll clocks configure CLK_IGNORE_UNUSED because hw dvfs does not call
> + * clock interface. hw dvfs can not gate the pll clock.
> + */
> +static CLK_FIXED_FACTOR_FW_NAME(clk_26m_aud, "clk-26m-aud", "ext-26m", 1, 1, 0);
[...]
> +       .hw_clks        = &ums512_pmu_gate_hws,
> +};
> +
> +/* pll clock at g0 */
> +static const u64 itable_dpll0[7] = {6, 0, 0,

Please put space after '{' and before '}'

> +                       1173000000ULL, 1475000000ULL,
> +                       1855000000ULL, 1866000000ULL};
> +
[...]
> +
> +static int ums512_clk_probe(struct platform_device *pdev)
> +{
> +       const struct sprd_clk_desc *desc;
> +
> +       desc = device_get_match_data(&pdev->dev);
> +       if (!desc)
> +               return -ENODEV;
> +
> +       sprd_clk_regmap_init(pdev, desc);

Check for error please

> +
> +       return sprd_clk_probe(&pdev->dev, desc->hw_clks);
> +}
> +