linux-kernel - Re: [PATCH v6 1/6] clk: sifive: Add pcie_aux clock in prci driver for PCIe driver

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Message-ID: <YJE886bhppqes5LQ@unreal>
Date:   Tue, 4 May 2021 15:24:19 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Greentime Hu <greentime.hu@...ive.com>
Cc:     paul.walmsley@...ive.com, hes@...ive.com, erik.danie@...ive.com,
        zong.li@...ive.com, bhelgaas@...gle.com, robh+dt@...nel.org,
        aou@...s.berkeley.edu, mturquette@...libre.com, sboyd@...nel.org,
        lorenzo.pieralisi@....com, p.zabel@...gutronix.de,
        alex.dewar90@...il.com, khilman@...libre.com,
        hayashi.kunihiko@...ionext.com, vidyas@...dia.com,
        jh80.chung@...sung.com, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        helgaas@...nel.org
Subject: Re: [PATCH v6 1/6] clk: sifive: Add pcie_aux clock in prci driver
 for PCIe driver

On Tue, May 04, 2021 at 06:59:35PM +0800, Greentime Hu wrote:
> We add pcie_aux clock in this patch so that pcie driver can use
> clk_prepare_enable() and clk_disable_unprepare() to enable and disable
> pcie_aux clock.
> 
> Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
> Acked-by: Stephen Boyd <sboyd@...nel.org>
> ---
>  drivers/clk/sifive/fu740-prci.c               | 11 +++++
>  drivers/clk/sifive/fu740-prci.h               |  2 +-
>  drivers/clk/sifive/sifive-prci.c              | 41 +++++++++++++++++++
>  drivers/clk/sifive/sifive-prci.h              |  9 ++++
>  include/dt-bindings/clock/sifive-fu740-prci.h |  1 +
>  5 files changed, 63 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/sifive/fu740-prci.c b/drivers/clk/sifive/fu740-prci.c
> index 764d1097aa51..53f6e00a03b9 100644
> --- a/drivers/clk/sifive/fu740-prci.c
> +++ b/drivers/clk/sifive/fu740-prci.c
> @@ -72,6 +72,12 @@ static const struct clk_ops sifive_fu740_prci_hfpclkplldiv_clk_ops = {
>  	.recalc_rate = sifive_prci_hfpclkplldiv_recalc_rate,

<...>

> +/* PCIE AUX clock APIs for enable, disable. */
> +int sifive_prci_pcie_aux_clock_is_enabled(struct clk_hw *hw)

It should be bool

> +{
> +	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
> +	struct __prci_data *pd = pc->pd;
> +	u32 r;
> +
> +	r = __prci_readl(pd, PRCI_PCIE_AUX_OFFSET);
> +
> +	if (r & PRCI_PCIE_AUX_EN_MASK)
> +		return 1;
> +	else
> +		return 0;
> +}

and here simple "return r & PRCI_PCIE_AUX_EN_MASK;"

> +
> +int sifive_prci_pcie_aux_clock_enable(struct clk_hw *hw)
> +{
> +	struct __prci_clock *pc = clk_hw_to_prci_clock(hw);
> +	struct __prci_data *pd = pc->pd;
> +	u32 r __maybe_unused;
> +
> +	if (sifive_prci_pcie_aux_clock_is_enabled(hw))
> +		return 0;

You actually call to this new function only once, put your
__prci_readl() here.

Thanks