linux-kernel - Re: [PATCH RESEND v5 1/1] clk: mstar: msc313 cpupll clk driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220930191742.9A9FEC433C1@smtp.kernel.org>
Date:   Fri, 30 Sep 2022 12:17:40 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Daniel Palmer <daniel@...f.com>,
        Michael Turquette <mturquette@...libre.com>,
        Romain Perier <romain.perier@...il.com>,
        linux-clk@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Willy Tarreau <w@....eu>
Subject: Re: [PATCH RESEND v5 1/1] clk: mstar: msc313 cpupll clk driver

Quoting Romain Perier (2022-06-03 12:05:09)
> From: Daniel Palmer <daniel@...f.com>
> 
> Add a driver for the CPU pll/ARM pll/MIPS pll that is present
> in MStar SoCs.
> 
> Currently there is no documentation for this block so it's possible
> this driver isn't entirely correct.
> 
> Only tested on the version of this IP in the MStar/SigmaStar
> ARMv7 SoCs.
> 
> Co-authored-by: Willy Tarreau <w@....eu>

This is not a standard tag, maybe Co-developed-by is what you want? A
Signed-off-by tag should be here from Willy Tarreau then.

> Signed-off-by: Daniel Palmer <daniel@...f.com>

Your Signed-off-by needs to be here. I can't apply this otherwise.

> diff --git a/drivers/clk/mstar/Kconfig b/drivers/clk/mstar/Kconfig
> index de37e1bce2d2..146eeb637318 100644
> --- a/drivers/clk/mstar/Kconfig
> +++ b/drivers/clk/mstar/Kconfig
> @@ -1,4 +1,11 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> +config MSTAR_MSC313_CPUPLL
> +       bool "MStar CPUPLL driver"
> +       depends on ARCH_MSTARV7 || COMPILE_TEST
> +       default ARCH_MSTARV7
> +       help
> +         Support for the CPU PLL present on MStar/Sigmastar SoCs.
> +
>  config MSTAR_MSC313_MPLL
>         bool "MStar MPLL driver"
>         depends on ARCH_MSTARV7 || COMPILE_TEST
> @@ -7,3 +14,4 @@ config MSTAR_MSC313_MPLL
>         help
>           Support for the MPLL PLL and dividers block present on
>           MStar/Sigmastar SoCs.
> +
> diff --git a/drivers/clk/mstar/Makefile b/drivers/clk/mstar/Makefile
> index f8dcd25ede1d..21296a04e65a 100644
> --- a/drivers/clk/mstar/Makefile
> +++ b/drivers/clk/mstar/Makefile
> @@ -2,5 +2,5 @@
>  #
>  # Makefile for mstar specific clk
>  #
> -
> +obj-$(CONFIG_MSTAR_MSC313_CPUPLL) += clk-msc313-cpupll.o
>  obj-$(CONFIG_MSTAR_MSC313_MPLL) += clk-msc313-mpll.o
> diff --git a/drivers/clk/mstar/clk-msc313-cpupll.c b/drivers/clk/mstar/clk-msc313-cpupll.c
> new file mode 100644
> index 000000000000..c57b509e8c20
> --- /dev/null
> +++ b/drivers/clk/mstar/clk-msc313-cpupll.c
> @@ -0,0 +1,221 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2019 Daniel Palmer <daniel@...ngy.jp>
> + */
> +
> +#include <linux/clk-provider.h>
> +#include <linux/of_address.h>
> +#include <linux/platform_device.h>

Ought to include kernel.h and device.h too.

> +
[...]
> +
> +static const struct clk_ops msc313_cpupll_ops = {
> +       .recalc_rate    = msc313_cpupll_recalc_rate,
> +       .round_rate     = msc313_cpupll_round_rate,
> +       .set_rate       = msc313_cpupll_set_rate,
> +};
> +
> +static const struct of_device_id msc313_cpupll_of_match[] = {
> +       { .compatible = "mstar,msc313-cpupll" },
> +       {}
> +};
> +
> +static const struct clk_parent_data cpupll_parent = {

Why not put this on the stack? It doesn't have to live forever.

> +       .index  = 0,
> +};
> +
> +static int msc313_cpupll_probe(struct platform_device *pdev)
> +{
> +       struct clk_init_data clk_init = {};
> +       struct device *dev = &pdev->dev;
> +       struct msc313_cpupll *cpupll;
> +       int ret;
> +
> +       cpupll = devm_kzalloc(&pdev->dev, sizeof(*cpupll), GFP_KERNEL);
> +       if (!cpupll)
> +               return -ENOMEM;
> +
> +       cpupll->base = devm_platform_ioremap_resource(pdev, 0);
> +       if (IS_ERR(cpupll->base))
> +               return PTR_ERR(cpupll->base);
> +
> +       /* LPF might not contain the current frequency so fix that up */
> +       msc313_cpupll_reg_write32(cpupll, REG_LPF_LOW_L,
> +                                 msc313_cpupll_reg_read32(cpupll, REG_CURRENT));
> +
> +       clk_init.name = dev_name(dev);
> +       clk_init.ops = &msc313_cpupll_ops;
> +       clk_init.parent_data = &cpupll_parent;
> +       clk_init.num_parents = 1;
> +       cpupll->clk_hw.init = &clk_init;
> +
> +       ret = devm_clk_hw_register(dev, &cpupll->clk_hw);
> +       if (ret)
> +               return ret;
> +
> +       return of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_simple_get, &cpupll->clk_hw);

Use devm to add the provider too.