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[87.143.4.210]) by smtp.gmail.com with ESMTPSA id m86sm11839223wmi.40.2018.01.28.15.29.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 28 Jan 2018 15:29:34 -0800 (PST) From: Philipp Rossak To: lee.jones@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com, maxime.ripard@free-electrons.com, wens@csie.org, linux@armlinux.org.uk, jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, davem@davemloft.net, hans.verkuil@cisco.com, mchehab@kernel.org, rask@formelder.dk, clabbe.montjoie@gmail.com, sean@mess.org, krzk@kernel.org, quentin.schulz@free-electrons.com, icenowy@aosc.io, edu.molinas@gmail.com, singhalsimran0@gmail.com Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com Subject: [PATCH v2 07/16] iio: adc: sun4i-gpadc-iio: rework: support nvmem calibration data Date: Mon, 29 Jan 2018 00:29:10 +0100 Message-Id: <20180128232919.12639-8-embed3d@gmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180128232919.12639-1-embed3d@gmail.com> References: <20180128232919.12639-1-embed3d@gmail.com> Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch reworks the driver to support nvmem calibration cells. The driver checks if the nvmem calibration is supported and reads out the nvmem. Signed-off-by: Philipp Rossak --- drivers/iio/adc/sun4i-gpadc-iio.c | 44 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c index ac9ad2f8232f..74eeb5cd5218 100644 --- a/drivers/iio/adc/sun4i-gpadc-iio.c +++ b/drivers/iio/adc/sun4i-gpadc-iio.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -74,6 +75,7 @@ struct gpadc_data { bool has_bus_rst; bool has_mod_clk; int sensor_count; + bool supports_nvmem; }; static const struct gpadc_data sun4i_gpadc_data = { @@ -87,6 +89,7 @@ static const struct gpadc_data sun4i_gpadc_data = { .sample_start = sun4i_gpadc_sample_start, .sample_end = sun4i_gpadc_sample_end, .sensor_count = 1, + .supports_nvmem = false, }; static const struct gpadc_data sun5i_gpadc_data = { @@ -100,6 +103,7 @@ static const struct gpadc_data sun5i_gpadc_data = { .sample_start = sun4i_gpadc_sample_start, .sample_end = sun4i_gpadc_sample_end, .sensor_count = 1, + .supports_nvmem = false, }; static const struct gpadc_data sun6i_gpadc_data = { @@ -113,6 +117,7 @@ static const struct gpadc_data sun6i_gpadc_data = { .sample_start = sun4i_gpadc_sample_start, .sample_end = sun4i_gpadc_sample_end, .sensor_count = 1, + .supports_nvmem = false, }; static const struct gpadc_data sun8i_a33_gpadc_data = { @@ -123,6 +128,7 @@ static const struct gpadc_data sun8i_a33_gpadc_data = { .sample_start = sun4i_gpadc_sample_start, .sample_end = sun4i_gpadc_sample_end, .sensor_count = 1, + .supports_nvmem = false, }; struct sun4i_gpadc_iio { @@ -141,6 +147,8 @@ struct sun4i_gpadc_iio { struct clk *mod_clk; struct reset_control *reset; int sensor_id; + u32 calibration_data[2]; + bool has_calibration_data[2]; /* prevents concurrent reads of temperature and ADC */ struct mutex mutex; struct thermal_zone_device *tzd; @@ -561,6 +569,9 @@ static int sun4i_gpadc_probe_dt(struct platform_device *pdev, struct resource *mem; void __iomem *base; int ret; + struct nvmem_cell *cell; + ssize_t cell_size; + u64 *cell_data; info->data = of_device_get_match_data(&pdev->dev); if (!info->data) @@ -575,6 +586,39 @@ static int sun4i_gpadc_probe_dt(struct platform_device *pdev, if (IS_ERR(base)) return PTR_ERR(base); + info->has_calibration_data[0] = false; + info->has_calibration_data[1] = false; + + if (!info->data->supports_nvmem) + goto no_nvmem; + + cell = nvmem_cell_get(&pdev->dev, "calibration"); + if (IS_ERR(cell)) { + if (PTR_ERR(cell) == -EPROBE_DEFER) + return PTR_ERR(cell); + goto no_nvmem; + } + + cell_data = (u64 *)nvmem_cell_read(cell, &cell_size); + nvmem_cell_put(cell); + switch (cell_size) { + case 8: + case 6: + info->has_calibration_data[1] = true; + info->calibration_data[1] = be32_to_cpu( + upper_32_bits(cell_data[0])); + case 4: + case 2: + info->has_calibration_data[0] = true; + info->calibration_data[0] = be32_to_cpu( + lower_32_bits(cell_data[0])); + break; + default: + break; + } + +no_nvmem: + info->regmap = devm_regmap_init_mmio(&pdev->dev, base, &sun4i_gpadc_regmap_config); if (IS_ERR(info->regmap)) {