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2020-05-22thermal: imx8mm: Replace zero-length array with flexible-arrayGustavo A. R. Silva
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] sizeof(flexible-array-member) triggers a warning because flexible array members have incomplete type[1]. There are some instances of code in which the sizeof operator is being incorrectly/erroneously applied to zero-length arrays and the result is zero. Such instances may be hiding some bugs. So, this work (flexible-array member conversions) will also help to get completely rid of those sorts of issues. This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20200507192517.GA16557@embeddedor
2020-03-23thermal: imx8mm: Fix build warning of incorrect argument typeAnson Huang
Fix below sparse warning: drivers/thermal/imx8mm_thermal.c:82:36: sparse: sparse: incorrect type in argument 2 (different address spaces), expected unsigned long const volatile *addr drivers/thermal/imx8mm_thermal.c:82:36: sparse: expected unsigned long const volatile *addr Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/1584973156-25734-1-git-send-email-Anson.Huang@nxp.com
2020-03-23thermal: imx8mm: Add i.MX8MP supportAnson Huang
i.MX8MP shares same TMU with i.MX8MM, the only difference is i.MX8MP has two thermal sensors while i.MX8MM ONLY has one, add multiple sensors support for i.MX8MM TMU driver. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/1584674791-9717-2-git-send-email-Anson.Huang@nxp.com
2020-03-12thermal: imx8mm: Add support for i.MX8MM thermal monitoring unitAnson Huang
i.MX8MM has a thermal monitoring unit(TMU) inside, it ONLY has one sensor for CPU, add support for reading immediate temperature of this sensor. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/1582947862-11073-2-git-send-email-Anson.Huang@nxp.com