linux-kernel - Re: [PATCH v2 6/6] clk: qcom: Add TCSR clock driver for Eliza

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: <w2zz36w7jpxafunxhan4jvdh47kx2mhxunazig3ubrvwe4yfhk@6sbi7rqo7lul>
Date: Fri, 6 Feb 2026 14:50:44 +0200
From: Abel Vesa <abel.vesa@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Luca Weiss <luca.weiss@...rphone.com>,
        Taniya Das <taniya.das@....qualcomm.com>,
        Taniya Das <quic_tdas@...cinc.com>, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/6] clk: qcom: Add TCSR clock driver for Eliza

On 26-02-04 13:36:57, Konrad Dybcio wrote:
> On 2/2/26 9:53 PM, Abel Vesa wrote:
> > On 26-01-30 22:40:32, Abel Vesa wrote:
> >> On 26-01-30 10:43:44, Konrad Dybcio wrote:
> >>> On 1/28/26 3:10 PM, Abel Vesa wrote:
> >>>> On 26-01-28 11:34:49, Konrad Dybcio wrote:
> >>>>> On 1/27/26 4:03 PM, Abel Vesa wrote:
> >>>>>> Add the TCSR clock controller that provides the refclks on Eliza
> >>>>>> platform for PCIe, USB and UFS subsystems.
> >>>>>>
> >>>>>> Co-developed-by: Taniya Das <taniya.das@....qualcomm.com>
> >>>>>> Signed-off-by: Taniya Das <taniya.das@....qualcomm.com>
> >>>>>> Signed-off-by: Abel Vesa <abel.vesa@....qualcomm.com>
> >>>>>> ---
> >>>>>
> >>>>> [...]
> >>>>>
> >>>>>> +++ b/drivers/clk/qcom/tcsrcc-eliza.c
> >>>>>> @@ -0,0 +1,144 @@
> >>>>>> +// SPDX-License-Identifier: GPL-2.0-only
> >>>>>> +/*
> >>>>>> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
> >>>>>> + */
> >>>>>> +
> >>>>>> +#include <linux/clk-provider.h>
> >>>>>> +#include <linux/mod_devicetable.h>
> >>>>>> +#include <linux/module.h>
> >>>>>> +#include <linux/of.h>
> >>>>>> +#include <linux/platform_device.h>
> >>>>>> +#include <linux/regmap.h>
> >>>>>> +
> >>>>>> +#include <dt-bindings/clock/qcom,eliza-tcsr.h>
> >>>>>> +
> >>>>>> +#include "clk-branch.h"
> >>>>>> +#include "clk-regmap.h"
> >>>>>> +#include "common.h"
> >>>>>> +
> >>>>>> +enum {
> >>>>>> +	DT_BI_TCXO_PAD,
> >>>>>> +};
> >>>>>> +
> >>>>>> +static struct clk_branch tcsr_pcie_0_clkref_en = {
> >>>>>> +	.halt_reg = 0x0,
> >>>>>
> >>>>> These regs certainly aren't at +0x0 to what we normally expect to
> >>>>> be the start of the TCSR node
> >>>>
> >>>> They are if we add the TCSR node with reg range starting at 0x1fbf000.
> >>>
> >>> "if we take the wrong base, the wrong offset is right" ;)
> >>>
> >>> The docs for Eliza don't have the nice separation like on e.g. Hamoa,
> >>> but 0x01fc0000 is what we generally agreed upon to be "tcsr".
> >>>
> >>> The registers that first appear in that region are the same as on Hamoa,
> >>> and so is the address, so let's continue that tradition
> > 
> > Actually, the 0x1fbf000 is the right base address.
> 
> Actually, I think it's 0x1fb_2000 ;)

As discussed off-list, using 0x1fb_2000 would include regs that Kaanapali for example
doesn't. So will use the 0x1fc_0000.

> 
> > TCSR mutex starts at 0x1f40000, and everything between 0x1fb2000 and 0xfbf000
> > doesn't really look like they belong in a clock controller.
> 
> Correct, and that's because TCSR is not a clock controller.

Correct, but as agreed off-list, for consistency reasons w.r.t. other SoCs,
it should not include that gap.

Thanks,
Abel