From: Michael Tretter <m.tretter@pengutronix.de>
To: Rajan Vaja <rajan.vaja@xilinx.com>
Cc: mturquette@baylibre.com, sboyd@kernel.org, robh+dt@kernel.org,
mark.rutland@arm.com, michal.simek@xilinx.com,
jolly.shah@xilinx.com, dan.carpenter@oracle.com,
gustavo@embeddedor.com, tejas.patel@xilinx.com,
nava.manne@xilinx.com, ravi.patel@xilinx.com,
linux-clk@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, m.tretter@pengutronix.de,
kernel@pengutronix.de
Subject: Re: [PATCH 4/7] clk: zynqmp: Add support for get max divider
Date: Thu, 21 Nov 2019 15:33:16 +0100 [thread overview]
Message-ID: <20191121153316.39e551e5@litschi.hi.pengutronix.de> (raw)
In-Reply-To: <1573564580-9006-5-git-send-email-rajan.vaja@xilinx.com>
On Tue, 12 Nov 2019 05:16:17 -0800, Rajan Vaja wrote:
> To achieve best possible rate, maximum limit of divider is required
> while computation. Get maximum supported divisor from firmware. To
> maintain backward compatibility assign maximum possible value(0xFFFF)
> if query for max divisor is not successful.
>
> Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
> ---
> drivers/clk/zynqmp/divider.c | 19 +++++++++++++++++++
> include/linux/firmware/xlnx-zynqmp.h | 1 +
> 2 files changed, 20 insertions(+)
>
> diff --git a/drivers/clk/zynqmp/divider.c b/drivers/clk/zynqmp/divider.c
> index d8f5b70d..b79cd45 100644
> --- a/drivers/clk/zynqmp/divider.c
> +++ b/drivers/clk/zynqmp/divider.c
> @@ -41,6 +41,7 @@ struct zynqmp_clk_divider {
> bool is_frac;
> u32 clk_id;
> u32 div_type;
> + u16 max_div;
> };
>
> static inline int zynqmp_divider_get_val(unsigned long parent_rate,
> @@ -195,6 +196,9 @@ struct clk_hw *zynqmp_clk_register_divider(const char *name,
> struct clk_hw *hw;
> struct clk_init_data init;
> int ret;
> + const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
> + struct zynqmp_pm_query_data qdata = {0};
> + u32 ret_payload[PAYLOAD_ARG_CNT];
>
> /* allocate the divider */
> div = kzalloc(sizeof(*div), GFP_KERNEL);
> @@ -215,6 +219,21 @@ struct clk_hw *zynqmp_clk_register_divider(const char *name,
> div->clk_id = clk_id;
> div->div_type = nodes->type;
>
> + /*
> + * To achieve best possible rate, maximum limit of divider is required
> + * while computation. Get maximum supported divisor from firmware. To
> + * maintain backward compatibility assign maximum possible value(0xFFFF)
> + * if query for max divisor is not successful.
> + */
> + qdata.qid = PM_QID_CLOCK_GET_MAX_DIVISOR;
> + qdata.arg1 = clk_id;
> + qdata.arg2 = nodes->type;
> + ret = eemi_ops->query_data(qdata, ret_payload);
> + if (ret)
> + div->max_div = U16_MAX;
> + else
> + div->max_div = ret_payload[1];
Add a helper function for retrieving the max divisor. The clk_register
function should really not be mixed with code to access the firmware.
Michael
> +
> hw = &div->hw;
> ret = clk_hw_register(NULL, hw);
> if (ret) {
> diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
> index f019d1c..f0d4558 100644
> --- a/include/linux/firmware/xlnx-zynqmp.h
> +++ b/include/linux/firmware/xlnx-zynqmp.h
> @@ -114,6 +114,7 @@ enum pm_query_id {
> PM_QID_CLOCK_GET_PARENTS,
> PM_QID_CLOCK_GET_ATTRIBUTES,
> PM_QID_CLOCK_GET_NUM_CLOCKS = 12,
> + PM_QID_CLOCK_GET_MAX_DIVISOR,
> };
>
> enum zynqmp_pm_reset_action {
next prev parent reply other threads:[~2019-11-21 14:33 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-12 13:16 [PATCH 0/7] clk: zynqmp: Extend and fix zynqmp clock driver Rajan Vaja
2019-11-12 13:16 ` [PATCH 1/7] dt-bindings: clock: Add bindings for versal " Rajan Vaja
2019-11-12 22:51 ` Stephen Boyd
2019-11-18 17:30 ` Rob Herring
2019-11-12 13:16 ` [PATCH 2/7] clk: zynqmp: Extend driver for versal Rajan Vaja
2019-11-12 13:16 ` [PATCH 3/7] clk: zynqmp: Warn user if clock user are more than allowed Rajan Vaja
2019-11-21 14:31 ` Michael Tretter
2019-11-12 13:16 ` [PATCH 4/7] clk: zynqmp: Add support for get max divider Rajan Vaja
2019-11-21 14:33 ` Michael Tretter [this message]
2019-11-12 13:16 ` [PATCH 5/7] clk: zynqmp: Fix divider calculation Rajan Vaja
2019-11-12 13:16 ` [PATCH 6/7] clk: zynqmp: Add support for clock with CLK_DIVIDER_POWER_OF_TWO flag Rajan Vaja
2019-11-12 13:16 ` [PATCH 7/7] clk: zynqmp: Fix fractional clock check Rajan Vaja
2019-11-21 14:41 ` Michael Tretter
2019-11-22 9:43 ` [PATCH v2 0/6] clk: zynqmp: Extend and fix zynqmp clock driver Rajan Vaja
2019-11-22 9:43 ` [PATCH v2 1/6] dt-bindings: clock: Add bindings for versal " Rajan Vaja
2019-12-04 19:53 ` Rob Herring
2019-11-22 9:43 ` [PATCH v2 2/6] clk: zynqmp: Extend driver for versal Rajan Vaja
2019-11-22 9:43 ` [PATCH v2 3/6] clk: zynqmp: Warn user if clock user are more than allowed Rajan Vaja
2019-11-22 9:43 ` [PATCH v2 4/6] clk: zynqmp: Add support for get max divider Rajan Vaja
2019-11-22 9:43 ` [PATCH v2 5/6] clk: zynqmp: Fix divider calculation Rajan Vaja
2019-11-22 9:43 ` [PATCH v2 6/6] clk: zynqmp: Add support for clock with CLK_DIVIDER_POWER_OF_TWO flag Rajan Vaja
2019-12-05 6:35 ` [PATCH v3 0/6] clk: zynqmp: Extend and fix zynqmp clock driver Rajan Vaja
2019-12-05 6:35 ` [PATCH v3 1/6] dt-bindings: clock: Add bindings for versal " Rajan Vaja
2020-01-23 22:58 ` Stephen Boyd
2019-12-05 6:35 ` [PATCH v3 2/6] clk: zynqmp: Extend driver for versal Rajan Vaja
2020-01-23 22:58 ` Stephen Boyd
2019-12-05 6:35 ` [PATCH v3 3/6] clk: zynqmp: Warn user if clock user are more than allowed Rajan Vaja
2020-01-23 22:58 ` Stephen Boyd
2019-12-05 6:35 ` [PATCH v3 4/6] clk: zynqmp: Add support for get max divider Rajan Vaja
2020-01-23 22:58 ` Stephen Boyd
2019-12-05 6:35 ` [PATCH v3 5/6] clk: zynqmp: Fix divider calculation Rajan Vaja
2020-01-23 22:58 ` Stephen Boyd
2019-12-05 6:35 ` [PATCH v3 6/6] clk: zynqmp: Add support for clock with CLK_DIVIDER_POWER_OF_TWO flag Rajan Vaja
2020-01-23 22:59 ` Stephen Boyd
2019-12-12 15:20 ` [PATCH v3 0/6] clk: zynqmp: Extend and fix zynqmp clock driver Michal Simek
2020-01-16 11:41 ` Rajan Vaja
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