netdev - Re: [PATCH RFC v6 2/6] dpll: Add DPLL framework base functions

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Date:   Mon, 20 Mar 2023 11:24:33 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Vadim Fedorenko <vadfed@...a.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Vadim Fedorenko <vadim.fedorenko@...ux.dev>, poros@...hat.com,
        mschmidt@...hat.com, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        Milena Olech <milena.olech@...el.com>,
        Michal Michalik <michal.michalik@...el.com>
Subject: Re: [PATCH RFC v6 2/6] dpll: Add DPLL framework base functions

Sun, Mar 12, 2023 at 03:28:03AM CET, vadfed@...a.com wrote:

[...]


>+static int
>+dpll_msg_add_pins_on_pin(struct sk_buff *msg, struct dpll_pin *pin,
>+			 struct netlink_ext_ack *extack)
>+{
>+	struct dpll_pin_ref *ref = NULL;

Pointless init.

[...]


>+static int
>+dpll_event_device_change(struct sk_buff *msg, struct dpll_device *dpll,
>+			 struct dpll_pin *pin, struct dpll_pin *parent,
>+			 enum dplla attr)
>+{
>+	int ret = dpll_msg_add_dev_handle(msg, dpll);
>+	struct dpll_pin_ref *ref = NULL;

Pointless init.

[...]


>+struct dpll_pin_ops {
>+	int (*frequency_set)(const struct dpll_pin *pin,
>+			     const struct dpll_device *dpll,
>+			     const u32 frequency,
>+			     struct netlink_ext_ack *extack);
>+	int (*frequency_get)(const struct dpll_pin *pin,
>+			     const struct dpll_device *dpll,
>+			     u32 *frequency, struct netlink_ext_ack *extack);
>+	int (*direction_set)(const struct dpll_pin *pin,
>+			     const struct dpll_device *dpll,
>+			     const enum dpll_pin_direction direction,
>+			     struct netlink_ext_ack *extack);
>+	int (*direction_get)(const struct dpll_pin *pin,
>+			     const struct dpll_device *dpll,
>+			     enum dpll_pin_direction *direction,
>+			     struct netlink_ext_ack *extack);


For frequency and direction, why exactly do you need to pass dpll
pointer? For set I can understand you need it to set the same
frequency/direction for all dplls the pin is connected to, but why for
get()?

[...]