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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 21/01/2025 22:42, Michal Wilczynski wrote: > > > On 1/21/25 11:02, Krzysztof Kozlowski wrote: >> On Mon, Jan 20, 2025 at 06:20:58PM +0100, Michal Wilczynski wrote: >>> The T-Head TH1520 SoC contains multiple power islands that can be >>> programmatically turned on and off using the AON (Always-On) protocol >>> and a hardware mailbox [1]. The relevant mailbox driver has already been >>> merged into the mainline kernel in commit 5d4d263e1c6b ("mailbox: >>> Introduce support for T-head TH1520 Mailbox driver"); >>> >>> This commit introduces a power-domain driver for the TH1520 SoC, which >> >> Please do not use "This commit/patch/change", but imperative mood. See >> longer explanation here: >> https://protect2.fireeye.com/v1/url?k=2123f702-40a8e22d-21227c4d-74fe485cbfe7-afb876722bdc8fc5&q=1&e=e5dabc89-5f0c-4819-9008-76faafc3c1bc&u=https%3A%2F%2Felixir.bootlin.com%2Flinux%2Fv5.17.1%2Fsource%2FDocumentation%2Fprocess%2Fsubmitting-patches.rst%23L95 >> >>> is using AON firmware protocol to communicate with E902 core through the >>> hardware mailbox. This way it can send power on/off commands to the E902 >>> core. >> >> ... >> >>> diff --git a/drivers/pmdomain/thead/Makefile b/drivers/pmdomain/thead/Makefile >>> new file mode 100644 >>> index 000000000000..adfdf5479c68 >>> --- /dev/null >>> +++ b/drivers/pmdomain/thead/Makefile >>> @@ -0,0 +1,2 @@ >>> +# SPDX-License-Identifier: GPL-2.0-only >>> +obj-$(CONFIG_TH1520_PM_DOMAINS) += th1520-pm-domains.o >>> diff --git a/drivers/pmdomain/thead/th1520-pm-domains.c b/drivers/pmdomain/thead/th1520-pm-domains.c >>> new file mode 100644 >>> index 000000000000..d913ad40fb76 >>> --- /dev/null >>> +++ b/drivers/pmdomain/thead/th1520-pm-domains.c >>> @@ -0,0 +1,174 @@ >>> +// SPDX-License-Identifier: GPL-2.0 >>> +/* >>> + * Copyright (C) 2021 Alibaba Group Holding Limited. >>> + * Copyright (c) 2024 Samsung Electronics Co., Ltd. >>> + * Author: Michal Wilczynski >>> + */ >>> + >>> +#include >>> +#include >>> +#include >>> +#include >>> + >>> +#include >> >> So here it is used... I don't understand why power domain is under >> firmware. Please move it to proper directory and name the file exactly >> the same as bindings doc which this belongs to. > > The power-domain driver has no bindings doc. It's a child driver of the AON > node. OK, not changing my comment, though. > >> >> >>> + >>> +struct th1520_power_domain { >>> + struct th1520_aon_chan *aon_chan; >>> + struct generic_pm_domain genpd; >>> + u32 rsrc; >>> +}; >>> + >>> +struct th1520_power_info { >>> + const char *name; >>> + u32 rsrc; >>> +}; >>> + >>> +static const struct th1520_power_info th1520_pd_ranges[] = { >>> + { "vdec", TH1520_AON_VDEC_PD }, >> >> Why TH1520_AON_XXX aren't the indices? > > These power-domain constants are defined by the AON firmware protocol, > which dictates the exact IDs (e.g., 1 for NPU). They are not just array > indices; we must use these specific values to communicate with the > firmware correctly. Using array indices starting with 1 would be > unusual. Then that's a no. Binding constants do not represent values used by your hardware. The binding constant should start from 0. Best regards, Krzysztof _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv