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x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191103_043049_028108_38C0BF19 X-CRM114-Status: GOOD ( 17.47 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, lars@metafoo.de, alexandre.torgue@st.com, linux-iio@vger.kernel.org, pmeerw@pmeerw.net, linux-kernel@vger.kernel.org, robh+dt@kernel.org, mcoquelin.stm32@gmail.com, knaack.h@gmx.de, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 28 Oct 2019 17:11:48 +0100 Fabrice Gasnier wrote: > Add new optional dt property to tune analog clock prescaler. > Driver looks for optional "st,max-clk-rate-hz", then computes > best approximation below that rate, using ADC internal prescaler. > > Signed-off-by: Fabrice Gasnier If the previous email I wrote on this got to anyone before I hit cancel, please ignore. Had completely failed to read the code correctly. Anyhow this seems fine to me, but given there are a lot of existing clk related bindings I'd like to give a little longer for Rob to have a chance to take a look at the binding. Give me a poke if I seem to have lost this in a week or so. Thanks, Jonathan > --- > drivers/iio/adc/stm32-adc-core.c | 16 +++++++++++++--- > 1 file changed, 13 insertions(+), 3 deletions(-) > > diff --git a/drivers/iio/adc/stm32-adc-core.c b/drivers/iio/adc/stm32-adc-core.c > index 20c626c..6537f4f 100644 > --- a/drivers/iio/adc/stm32-adc-core.c > +++ b/drivers/iio/adc/stm32-adc-core.c > @@ -79,6 +79,7 @@ struct stm32_adc_priv_cfg { > * @domain: irq domain reference > * @aclk: clock reference for the analog circuitry > * @bclk: bus clock common for all ADCs, depends on part used > + * @max_clk_rate: desired maximum clock rate > * @booster: booster supply reference > * @vdd: vdd supply reference > * @vdda: vdda analog supply reference > @@ -95,6 +96,7 @@ struct stm32_adc_priv { > struct irq_domain *domain; > struct clk *aclk; > struct clk *bclk; > + u32 max_clk_rate; > struct regulator *booster; > struct regulator *vdd; > struct regulator *vdda; > @@ -141,7 +143,7 @@ static int stm32f4_adc_clk_sel(struct platform_device *pdev, > } > > for (i = 0; i < ARRAY_SIZE(stm32f4_pclk_div); i++) { > - if ((rate / stm32f4_pclk_div[i]) <= priv->cfg->max_clk_rate_hz) > + if ((rate / stm32f4_pclk_div[i]) <= priv->max_clk_rate) > break; > } > if (i >= ARRAY_SIZE(stm32f4_pclk_div)) { > @@ -230,7 +232,7 @@ static int stm32h7_adc_clk_sel(struct platform_device *pdev, > if (ckmode) > continue; > > - if ((rate / div) <= priv->cfg->max_clk_rate_hz) > + if ((rate / div) <= priv->max_clk_rate) > goto out; > } > } > @@ -250,7 +252,7 @@ static int stm32h7_adc_clk_sel(struct platform_device *pdev, > if (!ckmode) > continue; > > - if ((rate / div) <= priv->cfg->max_clk_rate_hz) > + if ((rate / div) <= priv->max_clk_rate) > goto out; > } > > @@ -655,6 +657,7 @@ static int stm32_adc_probe(struct platform_device *pdev) > struct device *dev = &pdev->dev; > struct device_node *np = pdev->dev.of_node; > struct resource *res; > + u32 max_rate; > int ret; > > if (!pdev->dev.of_node) > @@ -731,6 +734,13 @@ static int stm32_adc_probe(struct platform_device *pdev) > priv->common.vref_mv = ret / 1000; > dev_dbg(&pdev->dev, "vref+=%dmV\n", priv->common.vref_mv); > > + ret = of_property_read_u32(pdev->dev.of_node, "st,max-clk-rate-hz", > + &max_rate); > + if (!ret) > + priv->max_clk_rate = min(max_rate, priv->cfg->max_clk_rate_hz); > + else > + priv->max_clk_rate = priv->cfg->max_clk_rate_hz; > + > ret = priv->cfg->clk_sel(pdev, priv); > if (ret < 0) > goto err_hw_stop; _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel