linux-kernel - Re: [PATCH v6 1/6] nvmem: add driver for JZ4780 efuse

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Date:   Fri, 28 Feb 2020 13:16:08 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>,
        Andreas Kemnade <andreas@...nade.info>,
        Mathieu Malaterre <malat@...ian.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paulburton@...nel.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org, letux-kernel@...nphoenux.org,
        kernel@...a-handheld.com
Subject: Re: [PATCH v6 1/6] nvmem: add driver for JZ4780 efuse


>>> +	rd_adj = clk_rate / 153846154;
>>> +	rd_strobe = clk_rate / 28571429 - 5 - rd_adj + 1;
>>> +
>>> +	if (rd_adj > BIT(4) - 1 || rd_strobe > BIT(4) - 1) {
>> 
>> Just use 0xF or GENMASK(3, 0) instead of BIT(4) - 1
> 
> Or would rd_adj >= BIT(4) be better since this is not used as a mask?
> This would also correspond to that the register is 4 bits wide.

I just recognized that we already have these constants defined:

So I'll add

	if (rd_adj > EFUCFG_RD_ADJ_MASK || rd_strobe > EFUCFG_RD_STR_MASK) {

to v7.

BR,
Nikolaus