linux-kernel - Re: [PATCH v3 4/4] clk: bcm: Add BCM63268 timer clock and reset driver

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Message-ID: <d06781c905adb23089a85a8d54b94461.sboyd@kernel.org>
Date:   Tue, 21 Mar 2023 16:06:33 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Florian Fainelli <f.fainelli@...il.com>,
        devicetree@...r.kernel.org, jonas.gorski@...il.com,
        krzysztof.kozlowski+dt@...aro.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, mturquette@...libre.com,
        p.zabel@...gutronix.de, robh+dt@...nel.org,
        william.zhang@...adcom.com,
        Álvaro Fernández Rojas <noltari@...il.com>
Subject: Re: [PATCH v3 4/4] clk: bcm: Add BCM63268 timer clock and reset driver

Quoting Florian Fainelli (2023-03-21 16:00:29)
> On 3/21/23 15:57, Stephen Boyd wrote:
> > Quoting Álvaro Fernández Rojas (2023-03-21 13:10:22)
> >> diff --git a/drivers/clk/bcm/clk-bcm63268-timer.c b/drivers/clk/bcm/clk-bcm63268-timer.c
> >> new file mode 100644
> >> index 000000000000..6a1fdd193cb5
> >> --- /dev/null
> >> +++ b/drivers/clk/bcm/clk-bcm63268-timer.c
> >> @@ -0,0 +1,232 @@
> >> +// SPDX-License-Identifier: GPL-2.0
> >> +/*
> >> + * BCM63268 Timer Clock and Reset Controller Driver
> > [...]
> >> +
> >> +static inline struct bcm63268_tclkrst_hw *
> >> +to_bcm63268_timer_reset(struct reset_controller_dev *rcdev)
> >> +{
> >> +       return container_of(rcdev, struct bcm63268_tclkrst_hw, rcdev);
> >> +}
> >> +
> >> +static int bcm63268_timer_reset_update(struct reset_controller_dev *rcdev,
> >> +                               unsigned long id, bool assert)
> >> +{
> >> +       struct bcm63268_tclkrst_hw *reset = to_bcm63268_timer_reset(rcdev);
> >> +       unsigned long flags;
> >> +       uint32_t val;
> >> +
> >> +       spin_lock_irqsave(&reset->lock, flags);
> >> +       val = __raw_readl(reset->regs);
> > 
> > Use regular ol readl() here, unless you have some need for no barrires
> > or byte swapping.
> 
> These SoCs are big-endian, require native endian register access and 
> have no posted writes within their bus logic (UBUS) and require no 
> barriers, hence the use of __raw_readl() and __raw_writel() is adequate.
> 

Use ioread32be() then?